Silicate and borosilicate glass with high refractive index and high transmittance to blue light

Abstract

The present invention provides diatomaceous earth and borosilicate glass having a high refractive index, low density, and high transmittance to blue light. [Solution] It contains silicon dioxide (SiO2) and / or boron oxide (B2O3) as a glass-forming agent and has a refractive index n of 1.80 or higher when measured at 587.56 nm. d And, when measured at 25℃, it was 5.5 g / cm³. 3 A glass is provided having the following density and, in particular, high transmittance to blue light. Optionally, the glass may be characterized by high transmittance in the visible and near-ultraviolet (near-UV) ranges of the electromagnetic spectrum, and / or good glass-forming properties.

Description

Priority

[0001] This application claims priority to U.S. Provisional Patent Application No. 63 / 076,551, filed September 10, 2020, under Section 119(e) of the U.S. Patent Act, which is incorporated herein by reference in its entirety. [Technical Field]

[0002] This disclosure generally relates to diatomaceous phosphate and borosilicate glass having a high refractive index, low density, and high transmittance to blue light. [Background technology]

[0003] Glass is used in a variety of optical devices, including augmented reality devices, virtual reality devices, mixed reality devices, and eyewear. Desired properties for this type of glass often include a high refractive index and low density. Further desirable properties may include high transmission in the visible and near-ultraviolet (near-UV) ranges of the electromagnetic spectrum, and / or low light dispersion. Finding a glass that can be formed from a composition having a desirable combination of these properties and good glass-forming properties can be difficult. For example, generally, as the refractive index of glass increases, the density also tends to increase. To increase the refractive index of glass without increasing its density, species such as TiO2 and Nb2O5 are often added. However, these materials often absorb blue and UV light, which undesirably can reduce the transmittance of light in these ranges of the spectrum by the glass. Attempts to increase the refractive index of glass while maintaining low density and without reducing transmittance in the blue and UV ranges of the spectrum often result in reduced glass-forming properties of the material. For example, crystallization and / or liquid-liquid separation may occur while cooling a glass molten material at a cooling rate generally acceptable in the industry. Typically, a decrease in glass-forming ability is observed when the amount of certain types of elements, such as ZrO2, Y2O3, Sc2O3, and BeO, increases.

[0004] Low-density, high-refractive-index glasses often belong to one of two types of chemical systems, based on the glass-forming agent used: (a) silicic acid or borosilicate glass, where SiO2 and / or B2O3 is used as the main glass-forming agent; and (b) phosphoric acid glass, where P2O5 is used as the main glass-forming agent. Glasses that rely on other oxides such as GeO2, TeO2, Bi2O3, and V2O5 as the main glass-forming agent may be difficult to use due to cost, glass-forming properties, optical properties, and / or manufacturing requirements.

[0005] While phosphated glass can be characterized by a high refractive index and low density, its manufacture can be difficult due to the risk of P2O5 volatilization from the molten material and / or incompatibility with platinum. Furthermore, phosphated glass is often heavily colored and may require an additional bleaching step to provide glass with the desired transmittance properties. Additionally, phosphated glass exhibiting a high refractive index tends to have increased light dispersion.

[0006] Diatomaceous crystalline and borosilicate glass are typically easy to manufacture and can exhibit high transmittance without a bleaching step. However, compared to phosphoric acid glass, diatomaceous crystalline and borosilicate glass typically show increased density when the refractive index is increased. [Overview of the project] [Problems that the invention aims to solve]

[0007] Considering these factors, there is a demand for diatomaceous earth and borosilicate glass, which have a high refractive index, low density, and high transmittance to blue light. [Means for solving the problem]

[0008] According to one embodiment of this disclosure, the glass contains: 9.0 mol% to 33.0 mol% of B2O3; 15.0 mol% to 50.0 mol% of La2O3; and more than 0.0 mol% of SiO2, provided that the ratio of SiO2 (expressed in mol%) to the total (SiO2 / (SiO2+B2O3)) of SiO2 and B2O3 (expressed in mol%) is 0.05 to 0.95; as well as Nb2O5, TiO2, ZrO2, Y2O3, Li2O, Ta2O5, Al2O3, BaO, Bi2O3, CaO, Er2O3, Gd2O3, K2O, Na2O, The glass contains at least one oxide selected from Nd2O3, P2O5, PbO, TeO2, WO3, Y2O3, Yb2O3, and ZnO, subject to the following conditions: Nb2O5 is 0.0 mol% to 12.0 mol%, TiO2 is 0.0 mol% to 40.0 mol%, ZrO2 is 0.0 mol% to 13.5 mol%, Y2O3 is 0.0 mol% to 3.0 mol%, ZnO is 0.0 mol% to 0.8 mol%, Li2O is 0.0 mol% to 0.5 mol%, and Ta2O5 is 0.0 mol% to 1.5 mol%. The above glass also contains formula (IX):

[0009]

number

[0010] Refractive index parameter P that satisfies this condition n and density parameter P d It has the above refractive index parameter P n Equation (VI):

[0011]

number

[0012] It is calculated according to, The above density parameter P d Equation (VII):

[0013]

number

[0014] It is calculated according to, Furthermore, the above glass has a transmittance index T of 0.532 or higher. i It has the above transmittance index T i Equation (III):

[0015]

number

[0016] The calculation is performed according to the formulas (VI), (VII), and (III), where each oxide listed in formulas (VII), (VII), and (III) refers to the amount of oxide in the glass, expressed in mole percent.

[0017] According to another embodiment of the present disclosure, the glass comprises: SiO2 of 3.0 mol% or more; B2O3 of 1.0 mol% or more, provided that the total of (SiO2 + B2O3) is 48.0 mol% or less; a total content of divalent metal oxides (RO) of 8.5 mol% or more; and selected from Nb2O5, TiO2, ZrO2, Y2O3, Li2O, Ta2O5, Al2O3, BaO, Bi2O3, CaO, Er2O3, Gd2O3, K2O, Na2O, Nd2O3, P2O5, PbO, TeO2, WO3, Y2O3, Yb2O3, and ZnO, wherein Gd2O3 is 0.0 mol% to 27.0 mol%, CaO is 0.0 mol% to 32.0 mol%, Li2O is 0.0 mol% to 7.0 mol%, MgO is 0.0 mol% to 5.0 mol%, Y2O3 is 0.0 mol% to 1.5 mol%, Ta2O5 is 0.0 mol% to 0.5 mol%, BaO is 0.0 mol% to 14.0 mol%, CdO is 0.0 mol% to 10.0 mol%, Bi2O3 is 0.0 mol% to 20.0 mol%, PbO is 0.0 mol% to 1.0 mol%, HfO2 is 0.0 mol% to 1.0 mol%, TeO2 is 0.0 mol% to 5.0 mol%, Nb2O5 is 0.0 mol% to 25.0 mol%, TiO2 is 0.0 mol% to 18.0 mol%, ZnO is 0.0 mol% to 2.0 mol%, fluorine is 0.0 atomic% to 1.0 atomic%, and the total of (SiO2 + B2O3 + Alk2O + MgO + CaO + SrO + BaO + ZnO) is 69.0 mol% or less, where Alk2O is the total content of alkali metal oxides, and (RE m O n + TiO2 + Nb2O5 + ZrO2 + Bi2O3 + WO3) is 25.0 mol% or more, where RE m O n is the total content of rare earth metal oxides, and contains at least one oxide according to the above conditions. The glass also has a refractive index parameter P

[0018]

Number

[0019] satisfying n and a transmittance index Ti It has the above refractive index parameter P n Equation (VI):

[0020]

number

[0021] It is calculated according to, Above transmittance index T i Equation (III):

[0022]

number

[0023] The calculation is performed according to the formula, and each oxide listed in formulas (VI) and (III) refers to the amount of oxide in the glass, expressed in mole percent.

[0024] According to another embodiment, the glass is selected from: 1.0 mol% to 40.0 mol% of TiO2; 1.0 mol% to 29.0 mol% of B2O3; 0.0 mol% to 32.0 mol% of SiO2, where the total of (SiO2 + B2O3) is 45.0 mol% or less; and Nb2O5, ZrO2, La2O3, Y2O3, Li2O, Al2O3, BaO, Bi2O3, CaO, Er2O3, Gd2O3, Na2O, Nd2O3, P2O5, PbO, WO3, Y2O3, Yb2O3, and ZnO, where La2O3 is 0.0 mol% to 30.0 mol%, ZrO2 is 0.0 mol% to 7.8 mol%, and Nb2O5 is 0.0 mol% The glass contains at least one oxide that conforms to the following conditions: the total content is ~7.0 mol%, CaO is 0.0 mol%~15.0 mol%, BaO is 0.0 mol%~15.0 mol%, Li2O is 0.0 mol%~3.5 mol%, GeO2 is 0.0 mol%~10.0 mol%, Al2O3 is 0.0 mol%~10.0 mol%, fluorine is 0.0 atom%~1.0 atom%, the total (Y2O3+ZnO) is 0.0 mol%~2.0 mol%, the total content of divalent metal oxides (RO) is 0.0 mol%~40.0 mol%, and the total content of monovalent metal oxides (R2O) is 0.0 mol%~15.0 mol%. The glass also has a transmittance index T of 0.25~0.75. i It has, and furthermore, formula (XII):

[0025]

number

[0026] Refraction parameter P that satisfies this condition ref and transmittance index T i It has the above refractive parameter P ref Equation (VIII):

[0027]

number

[0028] It is calculated according to, Above transmittance index T i Equation (III):

[0029]

number

[0030] The calculation is performed according to the formula (VIII) and formula (III), where each oxide listed in formula (VIII) and formula (III) refers to the amount of oxide in the glass, expressed in mole percent.

[0031] The above-mentioned and other aspects, purposes, and features of this disclosure will be understood by those skilled in the art by studying the following specification, claims, and drawings. [Brief explanation of the drawing]

[0032] [Figure 1] A plot showing the relationship between the transmittance index Ti, calculated according to equation (III), for several comparative examples of glass, and the minimum wavelength (λ70) corresponding to at least 70% of the total transmittance for a 10 mm thick glass sample. [Figure 2] Plots showing the relationship between density dRT (g / cm3) measured at room temperature and density parameter Pd calculated according to formula (VII) for several comparative example glasses and several exemplary glasses according to certain embodiments of the present disclosure. [Figure 3] Plots showing the relationship between the refractive index nd, measured at 587.56 nm, and the refractive index parameter Pn, calculated according to equation (VI), for several comparative example glasses and several exemplary glasses according to certain embodiments of the present disclosure. [Figure 4] Plots showing the relationship between the ratio of refractive index to density ("refractive index") (nd-1) / dRT and the refractive index parameter Pref calculated according to equation (VIII) for several comparative examples of glass and several exemplary glasses according to certain embodiments of the present disclosure. [Figure 5] Plots of exemplary cooling schedules according to “15-minute test” and “2.5-minute test” conditions for several exemplary glasses according to one embodiment of the present disclosure. [Figure 6] Plots showing the relationship between total transmittance τ and wavelength for some exemplary glass according to certain embodiments of this disclosure. [Figure 7] Plots showing the relationship between the density parameter Pd calculated according to formula (VII) and the refractive index parameter Pn calculated according to formula (VI) for several comparative example glasses and several exemplary glasses according to certain embodiments of the present disclosure. [Figure 8] Plots showing the relationship between density dRT (g / cm3) measured at room temperature and refractive index nd measured at 587.56 nm for some comparative example glasses and some exemplary glasses according to certain embodiments of the present disclosure. [Figure 9] Plots showing the relationship between the transmittance index Ti calculated according to formula (III) and the refractive index parameter Pn calculated according to formula (VI) for several comparative example glasses and several exemplary glasses according to certain embodiments of the present disclosure. [Figure 10] Plots showing the relationship between the transmittance index Ti, calculated according to formula (III), and the refractive index nd, measured at 587.56 nm, for some comparative example glasses and some exemplary glasses according to certain embodiments of the present disclosure. [Figure 11] Plots showing the relationship between the transmittance index Ti calculated according to formula (III) and the refractive parameter Pref calculated according to formula (VIII) for several comparative example glasses and several exemplary glasses according to certain embodiments of the present disclosure. [Figure 12] Plots showing the relationship between the transmittance index Ti, calculated according to formula (III), and the ratio of refractive index to density ("refractive index") (nd-1) / dRT for several comparative example glasses and several exemplary glasses according to certain embodiments of the present disclosure. [Modes for carrying out the invention]

[0033] The following "Modes for Carrying Out the Invention" provide a complete understanding of the various principles of this disclosure by describing exemplary embodiments that disclose specific details for illustrative purposes, not limitation. However, it will be apparent to those skilled in the art who have benefited from this disclosure that the disclosure can also be practiced in other embodiments that deviate from the specific details disclosed herein. Furthermore, descriptions of known devices, methods, and materials may be omitted so as not to obscure the explanation of the various principles of this disclosure. Finally, where applicable, similar reference numerals refer to similar elements.

[0034] As used herein, the term "and / or" means, when used in an enumeration of two or more items, that any one of the enumerated items may be taken alone, or any combination of two or more of the enumerated items may be taken. For example, if a composition is described as containing components A, B, and / or C, the composition may contain: A alone; B alone; C alone; A and B together; A and C together; B and C together; or A, B, and C together.

[0035] Those skilled in the art and those who create or use the Disclosure will be able to imagine modified forms of the Disclosure. Therefore, it will be understood that the embodiments shown in the drawings and described above are for illustrative purposes only and are not intended to limit the scope of the Disclosure as defined by the following claims, which are to be interpreted in accordance with the principles of patent law, including the doctrine of equivalents.

[0036] Where used herein, the term “about” means that quantities, sizes, formulations, parameters, and other quantities and characteristics are approximate and / or large or small, reflecting tolerances, conversion factors, rounding, measurement errors, and other factors known to those skilled in the art, as necessary, but not necessarily exact. Generally, quantities, sizes, formulations, parameters, or other quantities or characteristics are “about” or “approximate,” whether explicitly stated as such. Where the term “about” is used to describe a value or an endpoint of a range, it should be understood that this disclosure includes the specific value or endpoint mentioned. Whether or not a numerical value or range endpoint in this specification is described as “about,” it is intended to include two embodiments: embodiments modified with “about” and embodiments not modified with “about.” Furthermore, it will be understood that each range endpoint is important both in relation to other endpoints and independently of other endpoints.

[0037] The term "formed from" can mean one or more of the following: "comprise," "consist essentially of," or "consists of." For example, a component formed from a particular material may contain, essentially consist of, or consist of that material.

[0038] Unless otherwise specified, all compositions are expressed in mole percent (mol%) of the as-batch state. As those skilled in the art will understand, various molten components (e.g., fluorine, alkali metals, boron, etc.) may undergo varying levels of volatilization during the melting of these components (depending on, for example, vapor pressure, melting time, and / or melting temperature). Accordingly, the term “about” with respect to such components is intended to encompass values ​​of no more than about 0.2 mol% when the final article is measured compared to the as-batch state compositions provided herein. With this in mind, substantial compositional equivalence between the final article and the as-batch state compositions is expected. In some embodiments, where indicated so, the composition may be expressed in weight percent (wt%) of the oxides in the as-batch state.

[0039] When fluorine is added to oxide glass, or when fluorine is present in oxide glass, the molecular representation of the resulting glass composition can be expressed in several different ways. In this disclosure, when fluorine is present, the fluorine content as a single term is expressed in units of atomic percent (atomic%), which is determined based on 100 times the fraction of fluorine relative to the total number of atoms in the glass composition.

[0040] In this disclosure, the following methods of indicating fluorine-containing compositions and concentration ranges are used. The concentration limits for all oxides (e.g., SiO2, B2O3, Na2O, etc.) are given by their respective cations (e.g., silicon [Si 4+ ], boron [B 3+ ], sodium [Na + The following is presented under the assumption that the substances (etc.) are first presented in the form of their corresponding oxides. If fluorine is present, some of the oxygen in the oxide is replaced with equivalent fluorine (i.e., one oxygen atom is replaced by two fluorine atoms) in order to calculate the concentration of the components in the composition. Since the above fluorine is assumed to exist in the form of silicon fluoride (SiF4), the total amount of all oxides and SiF4 is 100 mole percent or 100% by weight in all compositions.

[0041] The terms "free" and "substantially free" are used interchangeably to refer to the amount and / or absence of specific components in a glass composition that are not intentionally added. A glass composition may contain trace amounts of certain components as impurities or blunt materials, in amounts less than 0.10 mol%.

[0042] When used to describe a particular component in a glass composition, the term "tramp" as used herein refers to a component that is not intentionally added to the glass composition but is present in an amount of less than 0.05 mol%. Tramp components may be unintentionally added to a glass composition as an impurity in another component, and / or by migration into the composition during processing of the glass composition.

[0043] In this specification, the term "glass former" refers to a component that exists alone in a glass composition (i.e., without other components except playing cards) and is capable of forming glass when the molten material is cooled at a rate of approximately 200°C / min to approximately 300°C / min or less.

[0044] As used herein, the term “modifier” refers to an oxide of a monovalent or divalent metal, i.e., M2O or MO (where “M” represents a metal). By adding a modifier to a glass composition, the atomic structure of the molten material and the resulting glass can be altered. In some embodiments, the modifier can alter the coordination number of cations present in the glass-forming agent (e.g., boron in B2O3), thereby enabling the formation of a more polymerized atomic network and consequently providing better glass formation.

[0045] As used herein, the term "RO" refers to the total content of divalent metal oxides, the term "R2O" refers to the total content of monovalent metal oxides, and the term "Alk2O" refers to the total content of alkali metal oxides. The term R2O includes alkali metal oxides (Alk2O) in addition to other monovalent metal oxides such as Ag2O, Tl2O, and Hg2O. As described below, in this disclosure, rare earth metal oxides are not included in the term "RO" because rare earth metals are referred to by their normalized formula (RE2O3) in which the redox state "+3" is present.

[0046] As used herein, the term “rare earth metal” refers to the metals listed in the lanthanide series of the IUPAC periodic table, as well as yttrium and scandium. As used herein, the term “rare earth metal oxide” refers to oxides of rare earth metals in various redox states, such as lanthanum at “+3” in La2O3, cerium at “+4” in CeO2, europium at “+2” in EuO, and so on. In general, the redox state of rare earth metals in oxide glasses can vary, and in particular, the redox state can change during melting based on the batch composition and / or the redox conditions in the furnace in which the glass is melted and / or heat-treated (e.g., annealed). Unless otherwise specified, rare earth metal oxides are referred herein by their normalized formula in which the rare earth metal has a redox state of “+3”. Therefore, when rare earth metals having a redox state other than "+3" are added to a batch of glass compositions, the glass composition is recalculated by adding or removing some oxygen to maintain stoichiometry. For example, when CeO2 (containing cerium in a redox state of "+4") is used as a batch component, the resulting glass composition is recalculated assuming that 2 moles of CeO2 are equivalent to 1 mole of Ce2O3, and the resulting glass composition is presented with respect to Ce2O3. Where used herein, the term "RE" m O nThe term "+3" is used to refer to the total content of rare earth metal oxides in all existing redox states, while the term "RE2O3" is used to refer to the total content of rare earth metal oxides in the "+3" redox state.

[0047] The measured density values ​​of glass reported in this specification are 0.001 g / cm³. 3 Using a helium pycnometer with an error of g / cm², 3 The unit is measured at room temperature. When used herein, the density measurement value at room temperature (d RT The values ​​(as described) are indicated as being measured at 20°C or 25°C and include multiple measurements obtained at temperatures that may be within the range of 20°C to 25°C. It is understood that room temperature may vary between approximately 20°C and approximately 25°C, but for the purposes of this disclosure, the variation in density within the temperature range of 20°C to 25°C is 0.001 g / cm³. 3 Since this is expected to be smaller than the error, it is not expected to affect the density measurements at room temperature reported herein.

[0048] As used herein, the term "low density" means 5.5 g / cm³ unless otherwise specified. 3 The term "low density parameter" refers to the density parameter P. d The value is 5.5 g / cm³. 3 This means the following:

[0049] As used herein, the term "refraction" means ratio: (n d -1) / d RT This refers to the relationship between refractive index and density, where the refractive index n d It was measured at 587.56 nm, and the density was g / cm³ at 25°C. 3 It is measured in units of [unit].

[0050] As used herein, “good glass-forming ability” refers to the ability of the molten material to withstand devitrification during cooling. Glass-forming ability can be measured by determining the critical cooling rate of the molten material. The term “critical cooling rate” or “v cr In this specification, "critical cooling rate" is used to refer to the minimum cooling rate at which a molten material of a given composition forms a glass that does not contain crystals visible under an optical microscope at a magnification of 100 to 500 times. The critical cooling rate can be used to measure the glass-forming ability of a composition, i.e., the ability of a molten material of a given glass composition to form glass upon cooling. Generally, the lower the critical cooling rate, the better the glass-forming ability.

[0051] The term "liquidus temperature" is used herein to refer to the lowest temperature at which the glass composition becomes completely liquid without the crystallization of its constituent components. The liquidus temperature values ​​reported herein were obtained by measuring samples using DSC or by isothermal holding of samples wrapped in platinum foil. To measure a sample using DSC, a powdered sample was heated to 1250°C at 10 K / min. The liquidus temperature was obtained at the end of the endothermic event corresponding to the melting of the crystals. For the second technique (isothermal holding), a glass block (approximately 1 cm) was used. 3 The glass block was wrapped in platinum foil to prevent volatilization and placed in a furnace at a given temperature for 17 hours. Next, the glass block was observed under an optical microscope to examine the crystals.

[0052] The refractive index values ​​reported herein were measured at room temperature (approximately 25°C) unless otherwise specified. The refractive index of glass samples was measured using a Metricon Model 2010 prism-coupler refractometer with an error of approximately ±0.0002. Using the Metricon, the refractive index of glass samples was measured at two or more wavelengths: approximately 406 nm, 473 nm, 532 nm, 633 nm, 828 nm, and 1064 nm. The measured dependence characterizes the dispersion, and by applying this to Cauchy's law or Sellmeyer's equation, the refractive index of the sample at a given wavelength of interest among the above multiple measurement wavelengths could be calculated. (Term: "refractive index n") d In this specification, "refractive index n" is used to refer to the refractive index calculated as described above at a wavelength of 587.56 nm, which corresponds to the helium d-line wavelength. C In this specification, the term "refractive index n" is used to refer to the refractive index at a wavelength of 656.3 nm, calculated as described above. F In this specification, the term "refractive index n" is used to refer to the refractive index at a wavelength of 486.1 nm, calculated as described above. g In this specification, "f" is used to refer to the refractive index calculated as described above at a wavelength of 435.8 nm.

[0053] Where used herein, the term “high refractive index” (or “high index”) refers to the refractive index of glass that is at least 1.80 when measured at a wavelength of 587.56 nm, unless otherwise specified. Where specified, “high refractive index” refers to the refractive index of glass that is at least 1.80, 1.85, 1.90, 1.95, or 2.00 when measured at a wavelength of 587.56 nm. The term “high refractive index parameter” refers to the refractive index parameter P that is 1.80 or higher, 1.85 or higher, at least 1.90, 1.95, or 2.00. n This refers to the value of [the object].

[0054] Where used herein, unless otherwise specified, the term "internal transmittance" refers to the transmittance through a glass sample corrected for Fresnel loss. The term "transmittance" refers to the transmittance value without considering Fresnel loss. The transmittance of a glass sample was measured for a 2 mm thick sample using an integrating sphere with a Cary 5000 spectrophotometer with a wavelength of 250 nm to 2500 nm and a resolution of 1 nm. The internal transmittance value for a 10 mm thick sample was calculated at 375 nm to 1175 nm using the measured refractive index and the measured raw transmittance.

[0055] The term "blue light" is used herein to refer to blue and ultraviolet light corresponding to wavelengths of approximately 330 nm to approximately 480 nm. Where used herein, the term "internal transmittance for blue light" refers to the Fresnel loss-corrected transmittance measured at a given wavelength for a 10 mm thick glass sample. The term "transmittance for blue light" refers to the transmittance for blue light without considering Fresnel loss. Where used herein, the internal transmittance (considering Fresnel loss) in the blue light region, measured at a wavelength of 460 nm for a 10 mm thick sample, can be considered acceptable if it is 90% or higher, good if it is 95% or higher, and excellent if it is 97% or higher.

[0056] Embodiments of this disclosure generally relate to diatomaceous phosphate and borosilicate glasses having a high refractive index and high transmittance to blue light. In some embodiments, the glasses may also be characterized by low density and / or good glass-forming properties. In some embodiments, the glasses are characterized by good transmittance to light in the visible spectrum.

[0057] According to one embodiment of the present disclosure, the glass described herein comprises silicon dioxide (SiO2) and / or boron oxide (B2O3) as a glass-forming agent. Increasing the amount of glass-forming oxides such as SiO2 and B2O3 can correspondingly increase the viscosity at a given temperature, thereby protecting the molten material from crystallization during cooling and thus providing a glass with a lower critical cooling rate. In some embodiments, the glass of the present disclosure may contain both SiO2 and B2O3 to provide a glass with a desired critical cooling rate, i.e., a desired degree of glass-forming ability.

[0058] According to some embodiments, the glass composition may contain silica (SiO2) in an amount of 0.0 mol% or more and 45.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain SiO2 in an amount of 0.0 mol% or more, 0.3 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 5.0 mol% or more, 9.6 mol% or more, 10.0 mol% or more, 15.0 mol% or more, 20.0 mol% or more, 25.0 mol% or more, 30.0 mol% or more, 31.0 mol% or more, or 40.0 mol% or more. In some other embodiments, the glass composition may contain SiO2 in amounts of 45.0 mol% or less, 40.0 mol% or less, 32.0 mol% or less, 31.0 mol% or less, 30.0 mol% or less, 25.0 mol% or less, 20.0 mol% or less, 15.0 mol% or less, 10.0 mol% or less, 5.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, or 1.0 mol% or less. In some further embodiments, the glass composition contains SiO2 in the following concentrations: 0.0 mol% to 45.0 mol%, 0.0 mol% to 40.0 mol%, 0.0 mol% to 32.0 mol%, 0.0 mol% to 10.0 mol%, 0.3 mol% to 45.0 mol%, 0.3 mol% to 40.0 mol%, 0.3 mol% to 30.0 mol%, 0.3 mol% to 10.0 mol%, 1.0 mol% to 25.0 mol%, 1.0 mol% to 10.0 mol%, 2.0 mol% to 25.0 mol%, and 3.0 mol% to 45. It may be included in amounts of 0 mol%, 40.0 mol% to 3.0 mol%, 3.0 mol% to 30.0 mol%, 3.0 mol% to 20.0 mol%, 3.0 mol% to 10.0 mol%, 10.0 mol% to 45.0 mol%, 10.0 mol% to 40.0 mol%, 10.0 mol% to 30.0 mol%, 10.0 mol% to 20.0 mol%, 15.0 mol% to 31.0 mol%, 15.0 mol% to 30.0 mol%, 17 mol% to 26 mol%, 4 mol% to 20 mol%, or 15 mol% to 30 mol%.

[0059] According to some embodiments, the glass composition may contain boron oxide (B2O3) in an amount of 1.0 mol% or more and 45.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain B2O3 in an amount of 1.0 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 4.0 mol% or more, 5.0 mol% or more, 9.0 mol% or more, 10.0 mol% or more, 15.0 mol% or more, 16.9 mol% or more, 20.0 mol% or more, 25.0 mol% or more, 30.0 mol% or more, 35.0 mol% or more, 37.0 mol% or more, 38.0 mol% or more, or 39.0 mol% or more. In some other embodiments, the glass composition may contain B2O3 in amounts of 45.0 mol% or less, 40.0 mol% or less, 39.0 mol% or less, 38.0 mol% or less, 37.0 mol% or less, 35.0 mol% or less, 30.0 mol% or less, 29.0 mol% or less, 25.0 mol% or less, 20.0 mol% or less, 15.0 mol% or less, 10.0 mol% or less, 5.0 mol% or less, 4.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, or 1.0 mol% or less.In some further embodiments, the glass composition contains B2O3 in amounts of 0.0 mol% to 45.0 mol%, 0.0 mol% to 40.0 mol%, 0.0 mol% to 30.0 mol%, 1.0 mol% to 45.0 mol%, 1.0 mol% to 40.0 mol%, 1.0 mol% to 35.0 mol%, 1.0 mol% to 29.0 mol%, 1.0 mol% to 15.0 mol%, 2.0 mol% to 35.0 mol%, 3.0 mol% to 35.0 mol%, 3.0 mol% to 29.0 mol%, 3.0 mol% to 15.0 mol%, 4.0 mol% to 40.0 mol%, 4.0 mol% to 25.0 mol%, 5.0 mol% to 40.0 mol%, 5.0 mol% to 37.0 mol%, and 5.0 It may be included in amounts of mol% to 29.0 mol%, 5.0 mol% to 25.0 mol%, 9.0 mol% to 33.0 mol%, 10.0 mol% to 25.0 mol%, 1.0 mol% to 29.0 mol%, 10.0 mol% to 33.0 mol%, 15.0 mol% to 38.0 mol%, 15.0 mol% to 35.0 mol%, 15.0 mol% to 33.0 mol%, 15.0 mol% to 29.0 mol%, 15.0 mol% to 25.0 mol%, 20.0 mol% to 38.0 mol%, 20.0 mol% to 35.0 mol%, 20.0 mol% to 33.0 mol%, 7.0 mol% to 33.0 mol%, 6.0 mol% to 30.0 mol%, or 12.0 mol% to 27.0 mol%.

[0060] However, the combination of SiO2 and B2O3 may result in a decrease in refractive index, which may make it more difficult to provide glass with the desired high refractive index. Therefore, in some embodiments, the total amount of SiO2 and B2O3 (SiO2 + B2O3) in the glass may be limited. In some embodiments, the glass composition may contain a total of (SiO2 + B2O3) in an amount of 0.0 mol% or more and 50.0 mol% or less, as well as all and partial ranges between the above values. In some embodiments, the glass composition may contain (SiO2 + B2O3) in an amount of 0.0 mol% or more, 2.0 mol% or more, 4.0 mol% or more, 6.0 mol% or more, 10.0 mol% or more, 20.0 mol% or more, 30.0 mol% or more, 40.0 mol% or more, 44.0 mol% or more, 46.0 mol% or more, or 48.0 mol% or more. In some other embodiments, the glass composition may contain (SiO2 + B2O3) in amounts of 50.0 mol% or less, 48.0 mol% or less, 46.0 mol% or less, 44.0 mol% or less, 40.0 mol% or less, 30.0 mol% or less, 20.0 mol% or less, 10.0 mol% or less, 6.0 mol% or less, 4.0 mol% or less, or 2.0 mol% or less. In some further embodiments, the glass composition contains (SiO2 + B2O3) in the following concentrations: 0.0 mol% to 50.0 mol%, 0.0 mol% to 48.0 mol%, 0.0 mol% to 46.0 mol%, 0.0 mol% to 44.0 mol%, 0.0 mol% to 20.0 mol%, 2.0 mol% to 50.0 mol%, 2.0 mol% to 48.0 mol%, 2.0 mol% to 46.0 mol%, 2.0 mol% to 44.0 mol%, 2.0 mol% to 20.0 mol%, 6.0 mol% to 46.0 mol%, 6.0 mol% to 20.0 mol%, and 10.0 mol% to 48.0 mol%. It may be included in amounts of 10.0 mol% to 46.0 mol%, 10.0 mol% to 40.0 mol%, 20.0 mol% to 50.0 mol%, 20.0 mol% to 48.0 mol%, 20.0 mol% to 46.0 mol%, 20.0 mol% to 40.0 mol%, 24.0 mol% to 48.0 mol%, 30.0 mol% to 48.0 mol%, 30.0 mol% to 44.0 mol%, 30.0 mol% to 40.0 mol%, 7.0 mol% to 40.0 mol%, 23.0 mol% to 48.0 mol%, 23.0 mol% to 40.0 mol%, or 8.0 mol% to 30.0 mol%.

[0061] In some embodiments, the glass composition may have a relative SiO2 / (SiO2+B2O3) [mol%] of 0.05 or more and 1.0 or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may have a relative SiO2 / (SiO2+B2O3) [mol%] of 0.05 or more, 0.1 or more, 0.1 or more, 0.2 or more, 0.25 or more, 0.3 or more, 0.5 or more, 0.8 or more, 0.85 or more, or 0.9 or more. In some other embodiments, the glass composition may have a relative SiO2 / (SiO2+B2O3) [mol%] of 1.0 or less, 0.9 or less, 0.95 or less, 0.8 or less, 0.85 or less, 0.5 or less, 0.3 or less, 0.25 or less, 0.2 or less, or 0.1 or less. In some further embodiments, the glass composition may have a relative SiO2 / (SiO2+B2O3) [mol%] of 0.05~1.0, 0.05~0.95, 0.05~0.9, 0.05~0.8, 0.05~0.6, 0.05~0.5, 0.05~0.3, 0.1~1.0, 0.1~0.8, 0.2~0.9, 0.2~0.8, 0.2~0.8, 0.3~1.0, 0.3~0.9, 0.3~0.8, 0.5~1.0, 0.5~0.9, 0.5~0.9, 0.5~0.8, 0.5~0.8, 0.8~0.9, 0.4~0.7, 0.3~0.6, or 0.4~0.7.

[0062] According to one embodiment of the present disclosure, the glass may include one or more refractive index enhancers added to increase the refractive index of the glass. Examples of refractive index enhancers that can be used with the glass of the present disclosure include titania (TiO2), niobia (Nb2O5), zirconia (ZrO2), and other rare earth metal oxides.

[0063] Titania (TiO2) is generally expected to increase the refractive index of glass, along with achieving low density and / or acceptable low dispersion. In some cases, titania may produce yellow or brown glass, which can be addressed by dissolution and / or annealing under oxidizing conditions, and / or bleaching by adding one or more oxidizing agents, such as CeO2, As2O5, and Mn2O3, to the glass batch. In some cases, too much titania may be counteracted by refractory species, such as rutile (TiO2), sphene (CaTiSiO5), and titanium niobate (e.g., Ti2Nb). 10 O 29 Titania may cause crystallization, which can raise the liquidus temperature of the glass and potentially reduce the glass-forming properties of the molten material. Furthermore, at high concentrations, titania may cause liquid-liquid separation of the molten material, which can lead to a loss of glass transmittance.

[0064] In some embodiments, the glass composition may contain titania (TiO2) in an amount of 0.0 mol% or more and 59.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain TiO2 in an amount of 0.0 mol% or more, 0.3 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 4.0 mol% or more, 6.0 mol% or more, 7.0 mol% or more, 9.0 mol% or more, 10.0 mol% or more, 20.0 mol% or more, 30.0 mol% or more, 40.0 mol% or more, 50.0 mol% or more, 53.0 mol% or more, 55.0 mol% or more, or 57.0 mol% or more. In some other embodiments, the glass composition may contain TiO2 in amounts of 59.0 mol% or less, 57.0 mol% or less, 55.0 mol% or less, 53.0 mol% or less, 50.0 mol% or less, 40.0 mol% or less, 30.0 mol% or less, 20.0 mol% or less, 10.0 mol% or less, 6.0 mol% or less, 4.0 mol% or less, or 2.0 mol% or less. In some further embodiments, the glass composition contains TiO2 in the following concentrations: 0.0 mol% to 59.0 mol%, 0.0 mol% to 50.0 mol%, 0.0 mol% to 40.0 mol%, 0.0 mol% to 18.0 mol%, 0.3 mol% to 40.0 mol%, 0.3 mol% to 18.0 mol%, 1.0 mol% to 40.0 mol%, 1.0 mol% to 18.0 mol%, 2.0 mol% to 53.0 mol%, 2.0 mol% to 30.0 mol%, 4.0 mol% to 30.0 mol%, 6.0 mol% to 59.0 mol%, 6.0 mol% to 53.0 mol%, and 10.0 It may be included in amounts of mol% to 55.0 mol%, 10.0 mol% to 50.0 mol%, 10.0 mol% to 30.0 mol%, 20.0 mol% to 55.0 mol%, 20.0 mol% to 50.0 mol%, 20.0 mol% to 30.0 mol%, 30.0 mol% to 55.0 mol%, 30.0 mol% to 50.0 mol%, 40.0 mol% to 59.0 mol%, 40.0 mol% to 57.0 mol%, 40.0 mol% to 50.0 mol%, 7.0 mol% to 24.0 mol%, 21.0 mol% to 38.0 mol%, or 30.0 mol% to 54.0 mol%.

[0065] In some embodiments of this disclosure, Niobia (Nb2O5) can be used, similar to titania, to increase the refractive index of glass while maintaining a low density. However, Niobia may introduce a yellowish tint into the glass that cannot be bleached in the same manner as titania, which may result in a loss of transmittance, particularly in the blue and UV ranges. Like titania, Niobia may cause crystallization and / or phase separation of the molten material. In some cases, Niobia may result in high light dispersion in the glass, which may be significantly higher than that induced by adding titania and any other refractive index enhancer at similar concentrations. Since the effect of Niobia may be influenced by other components of the glass, it may be difficult to determine the exact limit of Niobia. In some embodiments, the glass may not contain Niobia, or may be substantially free of it.

[0066] In some embodiments, the glass composition may contain Nb2O5 in amounts of 0.0 mol% or more and 25.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain Nb2O5 in amounts of 0.0 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 5.0 mol% or more, 10.0 mol% or more, 15.0 mol% or more, 20.0 mol% or more, 22.0 mol% or more, 23.0 mol% or more, or 24.0 mol% or more. In some other embodiments, the glass composition may contain Nb2O5 in amounts of 25.0 mol% or less, 24.0 mol% or less, 23.0 mol% or less, 22.0 mol% or less, 20.0 mol% or less, 15.0 mol% or less, 10.0 mol% or less, 5.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, or 1.0 mol% or less. In some further embodiments, the glass composition contains Nb2O5 in concentrations of 0.0 mol% to 25.0 mol%, 0.0 mol% to 22.0 mol%, 0.0 mol% to 12.0 mol%, 0.0 mol% to 10.0 mol%, 0.0 mol% to 7.0 mol%, 0.3 mol% to 15.0 mol%, 0.3 mol% to 12.0 mol%, 0.3 mol% to 7.0 mol%, 1.0 mol% to 10.0 mol%, 2.0 mol% to 25.0 mol%, 2.0 mol% to 22.0 mol%, and 3. It may be included in amounts of 0.0 mol% to 23.0 mol%, 3.0 mol% to 20.0 mol%, 3.0 mol% to 10.0 mol%, 5.0 mol% to 23.0 mol%, 10.0 mol% to 25.0 mol%, 10.0 mol% to 23.0 mol%, 15.0 mol% to 25.0 mol%, 15.0 mol% to 22.0 mol%, 15.0 mol% to 20.0 mol%, 11.0 mol% to 22.0 mol%, 8.0 mol% to 20.0 mol%, or 10.0 mol% to 21.0 mol%.

[0067] Zirconia (ZrO2) is another example of an oxide that can increase the refractive index while maintaining an acceptable low density of the glass of this disclosure. In some cases, ZrO2 can provide the glass with a higher density at similar refractive index values ​​compared to TiO2 and Nb2O5. ZrO2 can also increase the viscosity of the molten material, which may help protect the molten material from crystallization. In contrast to other refractive index enhancers such as TiO2 and Nb2O5, which can provide a low density to the glass, ZrO2 does not introduce coloration into the glass in the visible and near-UV ranges, which may help maintain the high transmittance of the glass. However, high concentrations of zirconia may cause crystallization of refractory inorganic materials such as zirconia (ZrO2), zircon (ZrSiO4), and calcium zirconate (CaZrO3), which may increase the liquidus temperature. As a result, crystallization may occur at relatively low viscosity, which may reduce the glass-forming properties of the molten material (i.e., the critical cooling rate may increase). To address these challenges, according to one aspect of this disclosure, the concentration of zirconia in the glass is 13.5 mol% or less, and in some examples, the glass is zirconia-free or substantially zirconia-free. In some cases, such as when the requirements for glass formation are low, the glass may contain a larger amount of zirconia.

[0068] In some embodiments, the glass composition may contain zirconia (ZrO2) in an amount of 0.0 mol% or more and 13.5 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain ZrO2 in an amount of 0.0 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 2.5 mol% or more, 3.0 mol% or more, 5.0 mol% or more, 6.1 mol% or more, 10.0 mol% or more, 10.5 mol% or more, 11.5 mol% or more, or 12.5 mol% or more. In some other embodiments, the glass composition may contain ZrO2 in an amount of 13.5 mol% or less, 12.5 mol% or less, 11.5 mol% or less, 10.5 mol% or less, 10.0 mol% or less, 5.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, or 1.0 mol% or less. In some further embodiments, the glass composition may contain ZrO2 in amounts of 0.0 mol% to 13.5 mol%, 0.0 mol% to 10.5 mol%, 0.0 mol% to 7.8 mol%, 0.3 mol% to 13.5 mol%, 0.3 mol% to 10.0 mol%, 0.3 mol% to 7.8 mol%, 1.0 mol% to 11.5 mol%, 1.0 mol% to 10.0 mol%, 2.0 mol% to 11.5 mol%, 2.0 mol% to 10.0 mol%, 3.0 mol% to 13.5 mol%, 5.0 mol% to 13.5 mol%, 10.0 mol% to 12.5 mol%, 6.5 mol% to 12.4 mol%, 3.6 mol% to 13.2 mol%, or 6.8 mol% to 12.4 mol%.

[0069] In some embodiments, rare earth metal oxides may be added to the glass composition to increase the refractive index of the glass of the Disclosure. Examples of rare earth metal oxides that can be added to the glass of the Disclosure include La2O3, Gd2O3, and Yb2O3. 3、Examples include Y2O3 and Sc2O3. In some embodiments, the glass composition comprises at least one rare earth metal oxide selected from La2O3, Gd2O3, Yb2O3, and combinations thereof. Oxides of the last two elements, namely Y2O3 and Sc2O3, can also provide the glass with a relatively low density, lower than titania and niobia at similar refractive indices. However, scandium oxide (Sc2O3) can be expensive and therefore undesirable for mass production. In some cases, Sc2O3 may be acceptable if the cost of the glass batch is a low priority. The cost of yttrium oxide (Y2O3) is lower than that of scandium oxide. However, in some cases, Y2O3, even at relatively low concentrations, can reduce the glass-forming properties of the glass (i.e., increase the critical cooling rate). Therefore, according to some embodiments of this disclosure, the glass may not contain, or may substantially not contain, Y2O3.

[0070] In some embodiments, the glass composition may contain yttria (Y2O3) in amounts of 0.0 mol% or more and 10.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain Y2O3 in amounts of 0.0 mol% or more, 0.5 mol% or more, 1.0 mol% or more, 1.5 mol% or more, 2.5 mol% or more, 5.0 mol% or more, 7.5 mol% or more, 8.5 mol% or more, 9.0 mol% or more, or 9.5 mol% or more. In some other embodiments, the glass composition may contain Y2O3 in amounts of 10.0 mol% or less, 9.5 mol% or less, 9.0 mol% or less, 8.5 mol% or less, 7.5 mol% or less, 5.0 mol% or less, 3.0 mol% or less, 2.5 mol% or less, 1.5 mol% or less, 1.0 mol% or less, or 0.5 mol% or less. In some further embodiments, the glass composition may contain Y2O3 in amounts of 0.0 mol% to 10.0 mol%, 0.0 mol% to 8.5 mol%, 0.0 mol% to 3.0 mol%, 0.0 mol% to 2.5 mol%, 0.0 mol% to 1.5 mol%, 1.0 mol% to 9.0 mol%, 1.5 mol% to 10.0 mol%, 2.5 mol% to 7.5 mol%, 5.0 mol% to 8.5 mol%, 1.5 mol% to 5.5 mol%, 4.7 mol% to 7.3 mol%, or 7.3 mol% to 9.9 mol%.

[0071] Among rare earth metal oxides, excluding Y2O3 and Sc2O3, lanthanum oxide (La2O3) can be a preferred refractive index enhancer in some embodiments. La2O3 can provide the glass of this disclosure with a lower density at a similar refractive index compared to several other rare earth metal oxides. La2O3 can also provide acceptablely good glass formation and is the most cost-effective among the rare earth metal oxides. Therefore, in some embodiments of this disclosure, the glass composition may contain at least a small amount of La2O3. However, in some cases, if the concentration of La2O3 becomes too high, lanthanum oxide can be replaced by lanthanum silicate (La4Si3O). 12La2O3 can cause precipitation of refractory species such as La2SiO5 (La2SiO5, La2Si2O7), lanthanum borate (LaBO3, LaB3O6), lanthanum niobate (LaNbO4), lanthanum zirconate (La2ZrO5, La2Zr2O7), and lanthanum titanate (La2TiO5, La2Ti2O7), which can raise the liquidus temperature of the glass and reduce the glass-forming properties of the composition. Furthermore, high concentrations of La2O3 can stimulate phase separation in the molten material, resulting in a loss of transmittance in the resulting glass. Similar adverse effects can occur with the addition of other rare earth metal oxides at high concentrations.

[0072] In some embodiments, the glass composition may contain lanthanum oxide (La2O3) in an amount of 0.0 mol% or more and 50.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain La2O3 in an amount of 0.0 mol% or more, 0.3 mol% or more, 2.0 mol% or more, 4.0 mol% or more, 5.0 mol% or more, 6.0 mol% or more, 10.0 mol% or more, 15.0 mol% or more, 20.0 mol% or more, 30.0 mol% or more, 40.0 mol% or more, 44.0 mol% or more, 46.0 mol% or more, or 48.0 mol% or more. In some other embodiments, the glass composition may contain La2O3 in amounts of 50.0 mol% or less, 48.0 mol% or less, 46.0 mol% or less, 44.0 mol% or less, 40.0 mol% or less, 30.0 mol% or less, 20.0 mol% or less, 10.0 mol% or less, 6.0 mol% or less, 4.0 mol% or less, or 2.0 mol% or less. In some further embodiments, the glass composition contains La2O3 in concentrations of 0.0 mol% to 50.0 mol%, 0.0 mol% to 44.0 mol%, 0.0 mol% to 30.0 mol%, 0.0 mol% to 20.0 mol%, 0.3 mol% to 30.0 mol%, 0.3 mol% to 20.0 mol%, 2.0 mol% to 20.0 mol%, 4.0 mol% to 44.0 mol%, 6.0 mol% to 50.0 mol%, 6.0 mol% to 46.0 mol%, 6.0 mol% to 40.0 mol%, 6.0 mol% to 20.0 mol%, and 10.0 mol% to 46. It may be included in amounts of 0 mol%, 10.0 mol% to 40.0 mol%, 10.0 mol% to 20.0 mol%, 15.0 mol% to 50.0 mol%, 15.0 mol% to 40.0 mol%, 15.0 mol% to 30.0 mol%, 20.0 mol% to 40.0 mol%, 30.0 mol% to 48.0 mol%, 30.0 mol% to 46.0 mol%, 30.0 mol% to 44.0 mol%, 30.0 mol% to 40.0 mol%, 7.0 mol% to 25.0 mol%, 25.0 mol% to 42.0 mol%, or 25.0 mol% to 46.0 mol%.

[0073] In some embodiments, the glass of the Disclosure may optionally contain further and / or other refractive index enhancers, such as tungsten oxide (WO3), tantalum oxide (Ta2O5), thorium oxide (ThO2), and bismuth oxide (Bi2O3), which may be used in small amounts if present. In some embodiments, the glass of the Disclosure may not contain or substantially contain tungsten oxide (WO3), tantalum oxide (Ta2O5), thorium oxide (ThO2), or bismuth oxide (Bi2O3). In some embodiments, the glass may optionally contain further and / or other refractive index enhancers selected from vanadium (V2O5), molybdenum oxide (MoO3), germania (GeO2), tellurium oxide (TeO2), fluorides (e.g., ZrF4, LaF3, etc.), and thallium oxide (Tl2O). Refractive index enhancers such as V2O5, MoO3, GeO2, TeO2, fluorides, and Tl2O may be used in some cases, although they may be less desirable in some situations due to their low transmittance, cost, and / or environmental concerns.

[0074] In some embodiments, the glass composition may contain tantalum oxide (Ta2O5) in an amount of 0.0 mol% or more and 5.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain Ta2O5 in an amount of 0.0 mol% or more, 0.2 mol% or more, 0.4 mol% or more, 0.6 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 4.0 mol% or more, 4.4 mol% or more, 4.6 mol% or more, or 4.8 mol% or more. In some other embodiments, the glass composition may contain Ta2O5 in amounts of 5.0 mol% or less, 4.8 mol% or less, 4.6 mol% or less, 4.4 mol% or less, 4.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, 1.5 mol% or less, 1.0 mol% or less, 0.6 mol% or less, 0.5 mol% or less, 0.4 mol% or less, or 0.2 mol% or less. In some further embodiments, the glass composition contains Ta2O5 in concentrations of 0.0 mol% to 5.0 mol%, 0.0 mol% to 4.4 mol%, 0.0 mol% to 2.0 mol%, 0.0 mol% to 1.5 mol%, 0.0 mol% to 0.5 mol%, 0.2 mol% to 4.4 mol%, 0.2 mol% to 2.0 mol%, 0.4 mol% to 4.4 mol%, 0.6 mol% to 4.6 mol%, 0.6 mol% to 4.0 mol%, and 0.6 It may be included in amounts of mol% to 2.0 mol%, 1.0 mol% to 5.0 mol%, 1.0 mol% to 4.6 mol%, 1.0 mol% to 4.0 mol%, 2.0 mol% to 4.0 mol%, 3.0 mol% to 5.0 mol%, 3.0 mol% to 4.6 mol%, 3.0 mol% to 4.4 mol%, 3.0 mol% to 4.0 mol%, 1.0 mol% to 3.0 mol%, 2.0 mol% to 4.0 mol%, or 1.0 mol% to 4.0 mol%.

[0075] In some embodiments, the glass composition may contain bismuth oxide (Bi2O3) in amounts of 0.0 mol% or more and 20.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain Bi2O3 in amounts of 0.0 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 5.0 mol% or more, 10.0 mol% or more, 15.0 mol% or more, 17.0 mol% or more, 18.0 mol% or more, or 19.0 mol% or more. In some other embodiments, the glass composition may contain Bi2O3 in amounts of 20.0 mol% or less, 19.0 mol% or less, 18.0 mol% or less, 17.0 mol% or less, 15.0 mol% or less, 10.0 mol% or less, 5.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, or 1.0 mol% or less. In some further embodiments, the glass composition may contain Bi2O3 in amounts of 0.0 mol% to 20.0 mol%, 0.0 mol% to 10.0 mol%, 1.0 mol% to 5.0 mol%, 2.0 mol% to 15.0 mol%, 3.0 mol% to 20.0 mol%, 3.0 mol% to 18.0 mol%, 5.0 mol% to 18.0 mol%, 5.0 mol% to 15.0 mol%, 10.0 mol% to 20.0 mol%, 10.0 mol% to 18.0 mol%, 10.0 mol% to 17.0 mol%, 5.0 mol% to 10.0 mol%, 6.0 mol% to 14.0 mol%, or 3.0 mol% to 10.0 mol%.

[0076] In some embodiments, the glass composition may contain tungsten oxide (WO3) in an amount of 0.0 mol% or more and 10.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain WO3 in an amount of 0.0 mol% or more, 2.5 mol% or more, 5.0 mol% or more, or 7.5 mol% or more. In some other embodiments, the glass composition may contain WO3 in an amount of 10.0 mol% or less, 7.5 mol% or less, 5.0 mol% or less, or 2.5 mol% or less. In some further embodiments, the glass composition may contain WO3 in amounts of 0.0 mol% to 10.0 mol%, 0.0 mol% to 7.5 mol%, 0.0 mol% to 5.0 mol%, 0.0 mol% to 2.5 mol%, 2.5 mol% to 10.0 mol%, 2.5 mol% to 7.5 mol%, 2.5 mol% to 5.0 mol%, 5.0 mol% to 10.0 mol%, 5.0 mol% to 7.5 mol%, 4.5 mol% to 7.9 mol%, 5.9 mol% to 9.6 mol%, or 3.0 mol% to 8.0 mol%.

[0077] In some embodiments, the glass composition may contain germania (GeO2) in amounts of 0.0 mol% or more and 10.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain GeO2 in amounts of 0.0 mol% or more, 0.5 mol% or more, 1.0 mol% or more, 1.5 mol% or more, 2.5 mol% or more, 5.0 mol% or more, 7.5 mol% or more, 8.5 mol% or more, 9.0 mol% or more, or 9.5 mol% or more. In some other embodiments, the glass composition may contain GeO2 in amounts of 10.0 mol% or less, 9.5 mol% or less, 9.0 mol% or less, 8.5 mol% or less, 7.5 mol% or less, 5.0 mol% or less, 2.5 mol% or less, 1.5 mol% or less, 1.0 mol% or less, or 0.5 mol% or less. In some further embodiments, the glass composition may contain GeO2 in amounts of 0.0 mol% to 10.0 mol%, 0.0 mol% to 2.5 mol%, 0.5 mol% to 2.5 mol%, 1.0 mol% to 10.0 mol%, 1.0 mol% to 9.0 mol%, 1.0 mol% to 7.5 mol%, 1.5 mol% to 9.0 mol%, 1.5 mol% to 7.5 mol%, 2.5 mol% to 10.0 mol%, 2.5 mol% to 9.0 mol%, 2.5 mol% to 7.5 mol%, 5.0 mol% to 8.5 mol%, 5.0 mol% to 7.5 mol%, 7.5 mol% to 9.5 mol%, 7.0 mol% to 9.9 mol%, 3.4 mol% to 8.3 mol%, or 5.0 mol% to 9.0 mol%.

[0078] In some embodiments, the glass composition may contain tellurium oxide (TeO2) in an amount of 0.0 mol% or more and 10.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain TeO2 in an amount of 0.0 mol% or more, 0.5 mol% or more, 1.0 mol% or more, 1.5 mol% or more, 2.5 mol% or more, 5.0 mol% or more, 7.5 mol% or more, 8.5 mol% or more, 9.0 mol% or more, or 9.5 mol% or more. In some other embodiments, the glass composition may contain TeO2 in an amount of 10.0 mol% or less, 9.5 mol% or less, 9.0 mol% or less, 8.5 mol% or less, 7.5 mol% or less, 5.0 mol% or less, 2.5 mol% or less, 1.5 mol% or less, 1.0 mol% or less, or 0.5 mol% or less. In some further embodiments, the glass composition may contain TeO2 in amounts of 0.0 mol% to 10.0 mol%, 0.0 mol% to 5.0 mol%, 0.0 mol% to 2.5 mol%, 0.5 mol% to 10.0 mol%, 0.5 mol% to 2.5 mol%, 1.0 mol% to 9.0 mol%, 1.0 mol% to 7.5 mol%, 1.5 mol% to 9.0 mol%, 1.5 mol% to 7.5 mol%, 2.5 mol% to 9.0 mol%, 2.5 mol% to 7.5 mol%, 5.0 mol% to 9.5 mol%, 5.0 mol% to 8.5 mol%, 5.0 mol% to 7.5 mol%, 1.9 mol% to 6.0 mol%, 5.0 mol% to 9.2 mol%, or 3.5 mol% to 9.2 mol%.

[0079] In some embodiments, the glass composition may contain hafnium oxide (HfO2) in amounts of 0.0 mol% or more and 5.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain HfO2 in amounts of 0.0 mol% or more, 0.2 mol% or more, 0.4 mol% or more, 0.6 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 4.0 mol% or more, 4.4 mol% or more, 4.6 mol% or more, or 4.8 mol% or more. In some other embodiments, the glass composition may contain HfO2 in amounts of 5.0 mol% or less, 4.8 mol% or less, 4.6 mol% or less, 4.4 mol% or less, 4.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, 1.0 mol% or less, 0.6 mol% or less, 0.4 mol% or less, or 0.2 mol% or less. In some further embodiments, the glass composition contains HfO2 in concentrations of 0.0 mol% to 5.0 mol%, 0.0 mol% to 4.4 mol%, 0.0 mol% to 2.0 mol%, 0.0 mol% to 1.0 mol%, 0.2 mol% to 5.0 mol%, 0.2 mol% to 4.4 mol%, 0.2 mol% to 2.0 mol%, 0.2 mol% to 1.0 mol%, 0.4 mol% to 2.0 mol%, 0.6 mol% to 4.0 mol%, and 0.6 mol%. It may be included in amounts of 1.0 mol% to 2.0 mol%, 1.0 mol% to 4.6 mol%, 1.0 mol% to 4.0 mol%, 2.0 mol% to 4.6 mol%, 2.0 mol% to 4.0 mol%, 3.0 mol% to 4.8 mol%, 3.0 mol% to 4.6 mol%, 3.0 mol% to 4.4 mol%, 3.0 mol% to 4.0 mol%, 1.0 mol% to 3.0 mol%, 3.0 mol% to 5.0 mol%, or 2.0 mol% to 3.0 mol%.

[0080] In some embodiments, the glass composition may contain gadolinium oxide (Gd2O3) in amounts of 0.0 mol% or more and 27.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain Gd2O3 in amounts of 0.0 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 5.0 mol% or more, 10.0 mol% or more, 15.0 mol% or more, 20.0 mol% or more, 25.0 mol% or more, or 26.0 mol% or more. In some other embodiments, the glass composition may contain Gd2O3 in amounts of 27.0 mol% or less, 26.0 mol% or less, 25.0 mol% or less, 20.0 mol% or less, 15.0 mol% or less, 10.0 mol% or less, 5.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, or 1.0 mol% or less. In some further embodiments, the glass composition contains Gd2O3 in concentrations of 0.0 mol% to 27.0 mol%, 0.0 mol% to 15.0 mol%, 2.0 mol% to 27.0 mol%, 2.0 mol% to 25.0 mol%, 2.0 mol% to 15.0 mol%, 3.0 mol% to 25.0 mol%, 5.0 mol% to 25.0 mol%, 5.0 mol% to 15.0 mol%, and 10.0 mol% to 2 It may be included in amounts of 7.0 mol%, 10.0 mol% to 25.0 mol%, 10.0 mol% to 20.0 mol%, 10.0 mol% to 15.0 mol%, 15.0 mol% to 26.0 mol%, 15.0 mol% to 25.0 mol%, 15.0 mol% to 20.0 mol%, 13.0 mol% to 25.0 mol%, 4.0 mol% to 24.0 mol%, or 10.0 mol% to 26.0 mol%.

[0081] In some embodiments, the glass composition may contain alumina (Al2O3) in an amount of 0.0 mol% or more and 10.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain Al2O3 in an amount of 0.0 mol% or more, 0.5 mol% or more, 1.0 mol% or more, 1.5 mol% or more, 2.5 mol% or more, 5.0 mol% or more, 7.5 mol% or more, 8.5 mol% or more, 9.0 mol% or more, or 9.5 mol% or more. In some other embodiments, the glass composition may contain Al2O3 in an amount of 10.0 mol% or less, 9.5 mol% or less, 9.0 mol% or less, 8.5 mol% or less, 7.5 mol% or less, 5.0 mol% or less, 2.5 mol% or less, 1.5 mol% or less, 1.0 mol% or less, or 0.5 mol% or less. In some further embodiments, the glass composition may contain Al2O3 in amounts of 0.0 mol% to 10.0 mol%, 0.0 mol% to 2.5 mol%, 0.5 mol% to 8.5 mol%, 0.5 mol% to 2.5 mol%, 1.0 mol% to 9.0 mol%, 1.5 mol% to 7.5 mol%, 2.5 mol% to 9.0 mol%, 2.5 mol% to 7.5 mol%, 5.0 mol% to 10.0 mol%, 5.0 mol% to 9.5 mol%, 5.0 mol% to 8.5 mol%, 5.0 mol% to 7.5 mol%, 4.2 mol% to 9.3 mol%, 4.4 mol% to 9.3 mol%, or 3.2 mol% to 8.0 mol%.

[0082] In some embodiments, the glass of the Disclosure may be fluorine-free or substantially fluorine-free. In some embodiments, the glass composition may contain fluorine (F) in amounts of 0.0 atomic% or more and 1.0 atomic% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain F in amounts of 0.0 atomic% or more, 0.05 atomic% or more, 0.10 atomic% or more, 0.15 atomic% or more, 0.25 atomic% or more, 0.5 atomic% or more, 0.75 atomic% or more, 0.85 atomic% or more, 0.9 atomic% or more, or 0.95 atomic% or more. In some other embodiments, the glass composition may contain F in an amount of 1.0 atomic% or less, 0.95 atomic% or less, 0.9 atomic% or less, 0.85 atomic% or less, 0.75 atomic% or less, 0.5 atomic% or less, 0.25 atomic% or less, 0.15 atomic% or less, 0.10 atomic% or less, or 0.05 atomic% or less. In some further embodiments, the glass composition may contain F in amounts of 0.0 to 1.0 atomic%, 0.0 to 0.85 atomic%, 0.0 to 0.25 atomic%, 0.05 to 0.85 atomic%, 0.05 to 0.25 atomic%, 0.15 to 1.0 atomic%, 0.15 to 0.9 atomic%, 0.15 to 0.75 atomic%, 0.5 to 0.9 atomic%, 0.5 to 0.85 atomic%, 0.5 to 0.75 atomic%, 0.75 to 0.95 atomic%, 0.24 to 0.68 atomic%, 0.36 to 0.83 atomic%, or 0.25 to 0.70 atomic%.

[0083] According to certain embodiments of the present disclosure, the glass may contain one or more modifiers. As stated above, the term “modifier” refers to an oxide of a monovalent or divalent metal, i.e., M2O or MO (where “M” represents a metal). Adding modifiers to the glass compositions of the present disclosure can improve the glass-forming properties of the molten material, i.e., reduce the critical cooling rate. Examples of modifiers that can be used in the glass of the present disclosure include alkali and alkaline earth modifiers such as CaO, MgO, BaO, Li2O, Na2O, and K2O, as well as other modifiers such as ZnO and Ag2O. According to one embodiment, the glass composition may contain CaO and / or Li2O, which have been found to provide a desired ratio between refractive index and density of the glass. In some embodiments, other alkali and alkaline earth metal oxides (e.g., Na2O, K2O, MgO, SrO, BaO) and other modifiers that do not cause discoloration (e.g., ZnO, Ag2O) may be included in the glass composition. While these other modifiers may not facilitate the provision of desired refractive index and / or density like CaO and Li2O, adding them to the glass composition can provide other properties. For example, adding barium oxide (BaO), potassium oxide (K2O), sodium oxide (Na2O), etc., can increase the solubility of refractive index enhancers (TiO2, Nb2O5, ZrO2, etc.) in the glass melt, which can lead to an overall increase in the refractive index of the glass and / or an increase in the refractive index-to-density ratio. According to one embodiment of the present disclosure, the glass may contain at least CaO as a modifier, as CaO has been found to provide a good balance of desired attributes of density, refractive index, and glass-forming properties. Therefore, in many examples of the present disclosure, all or at least some of the one or more modifiers present in the glass composition are in the form of CaO. In some embodiments, the glass may not contain or may substantially not contain any modifiers.

[0084] In some embodiments, the glass composition may contain calcium oxide (CaO) in an amount of 0.0 mol% or more and 40.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain CaO in an amount of 0.0 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 5.0 mol% or more, 10.0 mol% or more, 15.0 mol% or more, 20.0 mol% or more, 25.0 mol% or more, 30.0 mol% or more, 35.0 mol% or more, 37.0 mol% or more, 38.0 mol% or more, or 39.0 mol% or more. In some other embodiments, the glass composition may contain CaO in amounts of 40.0 mol% or less, 39.0 mol% or less, 38.0 mol% or less, 37.0 mol% or less, 35.0 mol% or less, 30.0 mol% or less, 25.0 mol% or less, 20.0 mol% or less, 15.0 mol% or less, 10.0 mol% or less, 5.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, or 1.0 mol% or less. In some further embodiments, the glass composition contains CaO in amounts of 0.0 mol% to 40.0 mol%, 0.0 mol% to 35.0 mol%, 0.0 mol% to 32.0 mol%, 0.0 mol% to 30.0 mol%, 0.0 mol% to 15.0 mol%, 1.0 mol% to 35.0 mol%, 1.0 mol% to 32.0 mol%, 1.0 mol% to 32.0 mol%, 1.0 mol% to 15.0 mol%, 2.0 mol% to 40.0 mol%, 2.0 mol% to 35.0 mol%, 3.0 mol% to 37.0 mol%, 3.0 mol% to 25.0 mol%, and 3.0 mol% to 10.0 mol%. It may be included in amounts of 10%, 5.0 mol% to 37.0 mol%, 5.0 mol% to 32.0 mol%, 5.0 mol% to 32.0 mol%, 10.0 mol% to 40.0 mol%, 10.0 mol% to 32.0 mol%, 10.0 mol% to 32.0 mol%, 10.0 mol% to 25.0 mol%, 15.0 mol% to 35.0 mol%, 15.0 mol% to 25.0 mol%, 20.0 mol% to 35.0 mol%, 25.0 mol% to 38.0 mol%, 25.0 mol% to 35.0 mol%, 6 mol% to 20 mol%, 24 mol% to 35 mol%, or 11 mol% to 25 mol%.

[0085] In some embodiments, the glass composition may contain zinc oxide (ZnO) in an amount of 0.0 mol% or more and 5.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain ZnO in an amount of 0.0 mol% or more, 0.2 mol% or more, 0.4 mol% or more, 0.6 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 4.0 mol% or more, 4.4 mol% or more, 4.6 mol% or more, or 4.8 mol% or more. In some other embodiments, the glass composition may contain ZnO in an amount of 5.0 mol% or less, 4.8 mol% or less, 4.6 mol% or less, 4.4 mol% or less, 4.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, 1.0 mol% or less, 0.8 mol% or less, 0.6 mol% or less, 0.4 mol% or less, or 0.2 mol% or less. In some further embodiments, the glass composition may contain ZnO in amounts of 0.0 mol% to 5.0 mol%, 0.0 mol% to 4.4 mol%, 0.0 mol% to 2.0 mol%, 0.0 mol% to 0.8 mol%, 0.2 mol% to 2.0 mol%, 0.4 mol% to 5.0 mol%, 0.4 mol% to 4.4 mol%, 0.6 mol% to 2.0 mol%, 1.0 mol% to 4.6 mol%, 1.0 mol% to 4.0 mol%, 2.0 mol% to 4.0 mol%, 3.0 mol% to 4.8 mol%, 3.0 mol% to 4.4 mol%, 1.0 mol% to 5.0 mol%, 2.0 mol% to 4.0 mol%, or 3.0 mol% to 4.0 mol%.

[0086] In some embodiments, the glass composition may contain cadmia (CdO) in amounts of 0.0 mol% or more and 10.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain CdO in amounts of 0.0 mol% or more, 0.5 mol% or more, 1.0 mol% or more, 1.5 mol% or more, 2.5 mol% or more, 5.0 mol% or more, 7.5 mol% or more, 8.5 mol% or more, 9.0 mol% or more, or 9.5 mol% or more. In some other embodiments, the glass composition may contain CdO in amounts of 10.0 mol% or less, 9.5 mol% or less, 9.0 mol% or less, 8.5 mol% or less, 7.5 mol% or less, 5.0 mol% or less, 2.5 mol% or less, 1.5 mol% or less, 1.0 mol% or less, or 0.5 mol% or less. In some further embodiments, the glass composition may contain CdO in amounts of 0.0 mol% to 10.0 mol%, 0.0 mol% to 8.5 mol%, 0.0 mol% to 2.5 mol%, 0.5 mol% to 8.5 mol%, 0.5 mol% to 2.5 mol%, 1.0 mol% to 10.0 mol%, 1.0 mol% to 9.0 mol%, 1.0 mol% to 7.5 mol%, 1.5 mol% to 10.0 mol%, 1.5 mol% to 7.5 mol%, 2.5 mol% to 9.0 mol%, 2.5 mol% to 7.5 mol%, 5.0 mol% to 9.0 mol%, 5.0 mol% to 7.5 mol%, 2.0 mol% to 6.5 mol%, 2.1 mol% to 9.3 mol%, or 4.5 mol% to 8.5 mol%.

[0087] In some embodiments, the glass composition may contain lead oxide (PbO) in an amount of 0.0 mol% or more and 5.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain PbO in an amount of 0.0 mol% or more, 0.2 mol% or more, 0.4 mol% or more, 0.6 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 4.0 mol% or more, 4.4 mol% or more, 4.6 mol% or more, or 4.8 mol% or more. In some other embodiments, the glass composition may contain PbO in an amount of 5.0 mol% or less, 4.8 mol% or less, 4.6 mol% or less, 4.4 mol% or less, 4.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, 1.0 mol% or less, 0.6 mol% or less, 0.4 mol% or less, or 0.2 mol% or less. In some further embodiments, the glass composition may contain PbO in amounts of 0.0 mol% to 5.0 mol%, 0.0 mol% to 4.4 mol%, 0.0 mol% to 2.0 mol%, 0.0 mol% to 1.0 mol%, 0.4 mol% to 5.0 mol%, 0.4 mol% to 2.0 mol%, 0.4 mol% to 1.0 mol%, 0.6 mol% to 2.0 mol%, 1.0 mol% to 5.0 mol%, 1.0 mol% to 4.0 mol%, 1.0 mol% to 2.0 mol%, 2.0 mol% to 5.0 mol%, 2.0 mol% to 4.6 mol%, 2.0 mol% to 4.0 mol%, 3.0 mol% to 4.8 mol%, 3.0 mol% to 4.0 mol%, 2 mol% to 4 mol%, 1 mol% to 4 mol%, or 1 mol% to 3 mol%.

[0088] In some embodiments, the glass composition may contain lithium oxide (Li2O) in an amount of 0.0 mol% or more and 7.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain Li2O in an amount of 0.0 mol% or more, 0.5 mol% or more, 1.0 mol% or more, 1.5 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 4.0 mol% or more, 5.5 mol% or more, 6.0 mol% or more, or 6.5 mol% or more. In some other embodiments, the glass composition may contain Li2O in an amount of 7.0 mol% or less, 6.5 mol% or less, 6.0 mol% or less, 5.5 mol% or less, 4.0 mol% or less, 2.0 mol% or less, 1.5 mol% or less, 1.0 mol% or less, or 0.5 mol% or less. In some further embodiments, the glass composition contains Li2O in amounts of 0.0 mol% to 7.0 mol%, 0.0 mol% to 5.5 mol%, 0.0 mol% to 4.0 mol%, 0.0 mol% to 3.5 mol%, 0.0 mol% to 0.5 mol%, 0.5 mol% to 7.0 mol%, 0.5 mol% to 6.0 mol%, 0.5 mol% to 4.0 mol%, 0.5 mol% to 3.5 mol%, and 1.0 mol% to 6.0 mol%. It may contain in amounts of 0%, 1.0 mol% to 4.0 mol%, 1.5 mol% to 7.0 mol%, 1.5 mol% to 4.0 mol%, 2.0 mol% to 7.0 mol%, 2.0 mol% to 5.5 mol%, 2.0 mol% to 4.0 mol%, 4.0 mol% to 6.5 mol%, 4.0 mol% to 5.5 mol%, 0.0 mol% to 6.0 mol%, 1.0 mol% to 3.0 mol%, or 1.0 mol% to 4.0 mol%. In some embodiments, the glass composition may contain sodium oxide (Na2O) in an amount of 0.0 mol% or more and 10.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain Na2O in an amount of 0.0 mol% or more, 2.5 mol% or more, 5.0 mol% or more, or 7.5 mol% or more. In some other embodiments, the glass composition may contain Na2O in an amount of 10.0 mol% or less, 7.5 mol% or less, 5.0 mol% or less, or 2.5 mol% or less. In some further embodiments, the glass composition may contain Na2O in amounts of 0.0 mol% to 10.0 mol%, 0.0 mol% to 7.5 mol%, 0.0 mol% to 5.0 mol%, 0.0 mol% to 2.5 mol%, 2.5 mol% to 10.0 mol%, 2.5 mol% to 7.5 mol%, 2.5 mol% to 5.0 mol%, 5.0 mol% to 10.0 mol%, 5.0 mol% to 7.5 mol%, 3.7 mol% to 6.3 mol%, 2.5 mol% to 7.5 mol%, or 2.7 mol% to 6.6 mol%.

[0089] In some embodiments, the glass composition may contain potassium oxide (K2O) in an amount of 0.0 mol% or more and 10.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain K2O in an amount of 0.0 mol% or more, 2.0 mol% or more, 2.5 mol% or more, 5.0 mol% or more, or 7.5 mol% or more. In some other embodiments, the glass composition may contain K2O in an amount of 10.0 mol% or less, 7.5 mol% or less, 5.0 mol% or less, or 2.5 mol% or less. In some further embodiments, the glass composition may contain K2O in amounts of 0.0 mol% to 10.0 mol%, 0.0 mol% to 7.5 mol%, 0.0 mol% to 5.0 mol%, 0.0 mol% to 2.5 mol%, 2.5 mol% to 10.0 mol%, 2.5 mol% to 7.5 mol%, 2.5 mol% to 5.0 mol%, 5.0 mol% to 10.0 mol%, 5.0 mol% to 7.5 mol%, 1.4 mol% to 6.5 mol%, 3.8 mol% to 6.8 mol%, or 2.0 mol% to 6.0 mol%.

[0090] In some embodiments, the glass composition may contain (Na2O + K2O) in an amount of 0.0 mol% or more and 10.0 mol% or less, as well as all and partial ranges between the above values. In some embodiments, the glass composition may contain (Na2O + K2O) in an amount of 0.0 mol% or more, 2.0 mol% or more, 2.5 mol% or more, 5.0 mol% or more, or 7.5 mol% or more. In some other embodiments, the glass composition may contain (Na2O + K2O) in an amount of 10.0 mol% or less, 7.5 mol% or less, 5.0 mol% or less, or 2.5 mol% or less. In some further embodiments, the glass composition may contain (Na2O+K2O) in amounts of 0.0 mol% to 10.0 mol%, 0.0 mol% to 7.5 mol%, 0.0 mol% to 5.0 mol%, 0.0 mol% to 2.5 mol%, 2.5 mol% to 10.0 mol%, 2.5 mol% to 7.5 mol%, 2.5 mol% to 5.0 mol%, 5.0 mol% to 10.0 mol%, 5.0 mol% to 7.5 mol%, 1.4 mol% to 6.5 mol%, 3.8 mol% to 6.8 mol%, or 2.0 mol% to 6.0 mol%.

[0091] In some embodiments, the glass composition may contain barium oxide (BaO) in an amount of 0.0 mol% or more and 15.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain BaO in an amount of 0.0 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 4.0 mol% or more, 5.0 mol% or more, 10.0 mol% or more, 12.0 mol% or more, 13.0 mol% or more, or 14.0 mol% or more. In some other embodiments, the glass composition may contain BaO in an amount of 15.0 mol% or less, 14.0 mol% or less, 13.0 mol% or less, 12.0 mol% or less, 10.0 mol% or less, 5.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, or 1.0 mol% or less. In some further embodiments, the glass composition may contain BaO in amounts of 0.0 mol% to 15.0 mol%, 0.0 mol% to 14.0 mol%, 0.0 mol% to 12.0 mol%, 0.0 mol% to 10.0 mol%, 2.0 mol% to 14.0 mol%, 2.0 mol% to 13.0 mol%, 2.0 mol% to 10.0 mol%, 3.0 mol% to 13.0 mol%, 5.0 mol% to 13.0 mol%, 5.0 mol% to 12.0 mol%, 5.0 mol% to 10.0 mol%, 10.0 mol% to 14.0 mol%, 6.0 mol% to 12.0 mol%, 2.6 mol% to 14.0 mol%, or 1.0 mol% to 7.2 mol%.

[0092] In some embodiments, the glass composition may contain magnesia (MgO) in an amount of 0.0 mol% or more and 10.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain MgO in an amount of 0.0 mol% or more, 0.5 mol% or more, 1.0 mol% or more, 1.5 mol% or more, 2.5 mol% or more, 5.0 mol% or more, 7.5 mol% or more, 8.5 mol% or more, 9.0 mol% or more, or 9.5 mol% or more. In some other embodiments, the glass composition may contain MgO in an amount of 10.0 mol% or less, 9.5 mol% or less, 9.0 mol% or less, 8.5 mol% or less, 7.5 mol% or less, 5.0 mol% or less, 2.5 mol% or less, 1.5 mol% or less, 1.0 mol% or less, or 0.5 mol% or less. In some further embodiments, the glass composition may contain MgO in amounts of 0.0 mol% to 10.0 mol%, 0.0 mol% to 8.5 mol%, 0.0 mol% to 5.0 mol%, 0.0 mol% to 2.5 mol%, 0.5 mol% to 8.5 mol%, 0.5 mol% to 5.0 mol%, 0.5 mol% to 2.5 mol%, 1.0 mol% to 10.0 mol%, 1.0 mol% to 9.0 mol%, 1.5 mol% to 10.0 mol%, 5.0 mol% to 9.5 mol%, 5.0 mol% to 9.0 mol%, 5.0 mol% to 7.5 mol%, 7.5 mol% to 9.5 mol%, 1.4 mol% to 5.0 mol%, 2.5 mol% to 7.0 mol%, or 3.5 mol% to 7.5 mol%.

[0093] In some embodiments, the glass composition may contain strontium oxide (SrO) in an amount of 0.0 mol% or more and 35.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain SrO in an amount of 0.0 mol% or more, 5.0 mol% or more, 10.0 mol% or more, 15.0 mol% or more, 20.0 mol% or more, 25.0 mol% or more, or 30.0 mol% or more. In some other embodiments, the glass composition may contain SrO in an amount of 35.0 mol% or less, 30.0 mol% or less, 25.0 mol% or less, 20.0 mol% or less, 15.0 mol% or less, 10.0 mol% or less, or 5.0 mol% or less. In some further embodiments, the glass composition contains SrO in amounts of 0.0 mol% to 35.0 mol%, 0.0 mol% to 25.0 mol%, 0.0 mol% to 15.0 mol%, 5.0 mol% to 35.0 mol%, 5.0 mol% to 25.0 mol%, 5.0 mol% to 15.0 mol%, 10.0 mol% to 35.0 mol%, 10.0 mol% to 30.0 mol%, 10.0 mol% to 25.0 mol%, and 10.0 mol% to 20.0 mol. It may be contained in amounts of %, 15.0 mol% to 35.0 mol%, 15.0 mol% to 30.0 mol%, 15.0 mol% to 25.0 mol%, 20.0 mol% to 35.0 mol%, 20.0 mol% to 30.0 mol%, 10.0 mol% to 20.0 mol%, 0.0 mol% to 7.5 mol%, 2.0 mol% to 7.5 mol%, 2.5 mol% to 7.5 mol%, 5.0 mol% to 28.0 mol%, or 19.0 mol% to 29.0 mol%.

[0094] In some embodiments, the glass composition may contain a total content of divalent metal oxide (RO) in an amount between 0.0 mol% and 40.0 mol%, and within all and partial ranges between the above values. Examples of divalent metal oxides include alkaline earth metal oxides. In some embodiments, the glass composition may contain RO in amounts of 0.0 mol% or more, 3.0 mol% or more, 5.0 mol% or more, 8.5 mol% or more, 10.0 mol% or more, 15.0 mol% or more, 20.0 mol% or more, 25.0 mol% or more, or 30.0 mol% or more. In some other embodiments, the glass composition may contain RO in amounts of 40.0 mol% or less, 35.0 mol% or less, 30.0 mol% or less, 25.0 mol% or less, 20.0 mol% or less, 15.0 mol% or less, 10.0 mol% or less, or 5.0 mol% or less. In some further embodiments, the above glass composition contains RO in the following concentrations: 0.0 mol% to 40.0 mol%, 0.0 mol% to 35.0 mol%, 0.0 mol% to 25.0 mol%, 0.0 mol% to 15.0 mol%, 3.0 mol% to 40.0 mol%, 3.0 mol% to 35.0 mol%, 3.0 mol% to 30.0 mol%, 3.0 mol% to 25.0 mol%, 5.0 mol% to 40.0 mol%, 5.0 mol% to 35.0 mol%, 5.0 mol% to 25.0 mol%, 5.0 mol% to 15.0 mol%, 10.0 mol% to 40.0 mol%, 10.0 mol% to 35.0 mol%, 10.0 mol% to 30.0 mol%, and 10. It may be contained in amounts of 0 mol% to 25.0 mol%, 10.0 mol% to 20.0 mol%, 15.0 mol% to 40.0 mol%, 15.0 mol% to 35.0 mol%, 15.0 mol% to 30.0 mol%, 15.0 mol% to 25.0 mol%, 20.0 mol% to 40.0 mol%, 20.0 mol% to 35.0 mol%, 20.0 mol% to 30.0 mol%, 8.5 mol% to 40.0 mol%, 8.5 mol% to 35.0 mol%, 8.5 mol% to 25.0 mol%, 8.5 mol% to 15.0 mol%, 12.0 mol% to 23.0 mol%, 15.0 mol% to 29.0 mol%, or 8.0 mol% to 32.0 mol%.

[0095] In some embodiments, the glass composition may contain monovalent metal oxide (R2O) in an amount of 0.0 mol% or more and 15.0 mol% or less, and within all and partial ranges between the above values. Examples of monovalent metal oxide R2O include alkali metal oxides. In some embodiments, the glass composition may contain R2O in amounts of 0.0 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 5.0 mol% or more, 10.0 mol% or more, 12.0 mol% or more, 13.0 mol% or more, or 14.0 mol% or more. In some other embodiments, the glass composition may contain R2O in amounts of 15.0 mol% or less, 14.0 mol% or less, 13.0 mol% or less, 12.0 mol% or less, 10.0 mol% or less, 5.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, or 1.0 mol% or less. In some further embodiments, the glass composition may contain R2O in amounts of 0.0 mol% to 15.0 mol%, 0.0 mol% to 12.0 mol%, 1.0 mol% to 15.0 mol%, 1.0 mol% to 13.0 mol%, 2.0 mol% to 15.0 mol%, 2.0 mol% to 13.0 mol%, 3.0 mol% to 15.0 mol%, 3.0 mol% to 13.0 mol%, 3.0 mol% to 10.0 mol%, 5.0 mol% to 14.0 mol%, 5.0 mol% to 13.0 mol%, 5.0 mol% to 12.0 mol%, 5.0 mol% to 10.0 mol%, 10.0 mol% to 14.0 mol%, 2.1 mol% to 9.0 mol%, 2.5 mol% to 7.4 mol%, or 7.5 mol% to 13.7 mol%.

[0096] In some embodiments, the glass composition is expressed in units of mol% (RE m O n The total of (+TiO2+Nb2O5+ZrO2+Bi2O3+WO3) may be present in amounts of 0.0 mol% or more and 65.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain 0.0 mol% or more, 10.0 mol% or more, 20.0 mol% or more, 25.0 mol% or more, 30.0 mol% or more, 39.0 mol% or more, 40.0 mol% or more, 50.0 mol% or more, or 60.0 mol% or more of (RE m O nThe total of (+TiO2+Nb2O5+ZrO2+Bi2O3+WO3) may be present. In some other embodiments, the glass composition may have 65.0 mol% or less, 60.0 mol% or less, 50.0 mol% or less, 40.0 mol% or less, 30.0 mol% or less, 20.0 mol% or less, or 10.0 mol% or less, (RE m O n The total of (+TiO2+Nb2O5+ZrO2+Bi2O3+WO3) may be... In some further embodiments, the glass composition may have a concentration of 0.0 mol% to 65.0 mol%, 0.0 mol% to 50.0 mol%, 0.0 mol% to 30.0 mol%, 5.0 mol% to 65.0 mol%, 5.0 mol% to 50.0 mol%, 5.0 mol% to 30.0 mol%, 20.0 mol% to 65.0 mol%, 20.0 mol% to 60.0 mol%, 20.0 mol% to 55.0 mol%, 20.0 mol% to 50.0 mol%, and 25.0 mol% to 6... 5.0 mol%, 25.0 mol%~60.0 mol%, 25.0 mol%~55.0 mol%, 25.0 mol%~50.0 mol%, 25.0 mol%~40.0 mol%, 30.0 mol%~65.0 mol%, 30.0 mol%~60.0 mol%, 30.0 mol%~50.0 mol%, 39.0 mol%~50.0 mol%, 18.0 mol%~45.0 mol%, 13.0 mol%~44.0 mol%, or 13.0 mol%~40.0 mol%, (RE m O n It may have the sum of (+TiO2+Nb2O5+ZrO2+Bi2O3+WO3).

[0097] In some embodiments, the glass composition may contain (SiO2 + B2O3 + Alk2O + MgO + CaO + SrO + BaO + ZnO) in an amount of 0.0 mol% or more and 69.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain (SiO2 + B2O3 + Alk2O + MgO + CaO + SrO + BaO + ZnO) in amounts of 0.0 mol% or more, 2.0 mol% or more, 4.0 mol% or more, 6.0 mol% or more, 10.0 mol% or more, 20.0 mol% or more, 30.0 mol% or more, 40.0 mol% or more, 50.0 mol% or more, 60.0 mol% or more, 63.0 mol% or more, 65.0 mol% or more, or 67.0 mol% or more. In some other embodiments, the glass composition may contain (SiO2 + B2O3 + Alk2O + MgO + CaO + SrO + BaO + ZnO) in amounts of 69.0 mol% or less, 67.0 mol% or less, 65.0 mol% or less, 63.0 mol% or less, 60.0 mol% or less, 50.0 mol% or less, 40.0 mol% or less, 30.0 mol% or less, 20.0 mol% or less, 10.0 mol% or less, 6.0 mol% or less, 4.0 mol% or less, or 2.0 mol% or less. In some further embodiments, the glass composition (SiO2 + B2O3 + Alk2O + MgO + CaO + SrO + BaO + ZnO) is expressed in concentrations of 0.0 mol% to 69.0 mol%, 0.0 mol% to 60.0 mol%, 0.0 mol% to 20.0 mol%, 2.0 mol% to 69.0 mol%, 2.0 mol% to 60.0 mol%, 2.0 mol% to 20.0 mol%, 4.0 mol% to 69.0 mol%, 4.0 mol% to 63.0 mol%, and 4.0 mol% to 4 It may be included in amounts of 0.0 mol%, 6.0 mol% to 63.0 mol%, 10.0 mol% to 63.0 mol%, 20.0 mol% to 65.0 mol%, 20.0 mol% to 60.0 mol%, 20.0 mol% to 40.0 mol%, 30.0 mol% to 69.0 mol%, 30.0 mol% to 60.0 mol%, 40.0 mol% to 60.0 mol%, 7.0 mol% to 6.03 mol%, 13.0 mol% to 45.0 mol%, or 15.0 mol% to 55.0 mol%.

[0098] In some embodiments, the glass composition may contain the total amount of ZnO and Y2O3 (ZnO + Y2O3) in an amount of 0.0 mol% or more and 5.0 mol% or less, and within all and partial ranges between the above values. In some embodiments, the glass composition may contain (ZnO + Y2O3) in an amount of 0.0 mol% or more, 0.2 mol% or more, 0.4 mol% or more, 0.6 mol% or more, 1.0 mol% or more, 2.0 mol% or more, 3.0 mol% or more, 4.0 mol% or more, 4.4 mol% or more, 4.6 mol% or more, or 4.8 mol% or more. In some other embodiments, the glass composition may contain (ZnO+Y2O3) in amounts of 5.0 mol% or less, 4.8 mol% or less, 4.6 mol% or less, 4.4 mol% or less, 4.0 mol% or less, 3.0 mol% or less, 2.0 mol% or less, 1.0 mol% or less, 0.6 mol% or less, 0.4 mol% or less, or 0.2 mol% or less. In some further embodiments, the glass composition may contain (ZnO+Y2O3) in amounts of 0.0 mol% to 5.0 mol%, 0.0 mol% to 4.4 mol%, 0.2 mol% to 4.4 mol%, 0.4 mol% to 5.0 mol%, 0.0 mol% to 2.0 mol%, 0.6 mol% to 2.0 mol%, 1.0 mol% to 5.0 mol%, 1.0 mol% to 4.6 mol%, 1.0 mol% to 4.0 mol%, 1 It may be included in amounts of 0.0 mol% to 2.0 mol%, 2.0 mol% to 4.6 mol%, 2.0 mol% to 4.0 mol%, 3.0 mol% to 5.0 mol%, 3.0 mol% to 4.8 mol%, 3.0 mol% to 4.6 mol%, 3.0 mol% to 4.4 mol%, 3.0 mol% to 4.0 mol%, 0.0 mol% to 3.0 mol%, 1.0 mol% to 3.0 mol%, or 1.0 mol% to 5.0 mol%.

[0099] According to one embodiment of this disclosure, the glass described herein has a refractive index n of 1.80 or greater when measured at 587.56 nm. d In some examples, the above glass has a refractive index n of 1.80 or higher, 1.85 or higher, 1.90 or higher, 1.95 or higher, 2.00 or higher, 2.05 or higher, or 2.10 or higher when measured at 587.56 nm. dIn some examples, the above glass has refractive indices n of 1.80~2.10, 1.85~2.10, 1.90~2.10, 1.91~2.10, 1.95~2.10, 2.00~2.10, 2.05~2.10, 1.80~2.05, 1.85~2.05, 1.90~2.05, 1.91~2.05, 1.95~2.05, 2.00~2.05, 1.80~2.00, 1.85~2.00, 1.90~2.00, 1.91~2.00, 1.95~2.00, 1.80~1.95, 1.85~1.95, 1.90~1.95, or 1.91~1.95 when measured at 587.56 nm. d It has.

[0100] At a given refractive index, a low density corresponds to a smaller weight for the optical element in which the glass is used. Size and weight can be important in many types of optical devices, particularly portable optical devices such as augmented reality systems. As described above, the glass of this disclosure has a high refractive index along with a low density. According to one embodiment of this disclosure, the glass described herein has a density of 5.5 g / cm³ when measured at 25°C. 3 The density d below RT In some examples, the glass of this disclosure has a density of 5.5 g / cm³ when measured at 25°C. 3 Below, 5.3g / cm 3 Below, 5.1g / cm 3 Below, 4.9g / cm 3 Below 4.8g / cm 3 The following, or 4.5 g / cm³ 3 The density d below RT It may have a refractive index n of 1.95 or higher when measured at a wavelength of 587.56 nm. In some examples, the glass may have a refractive index n of 1.95 or higher when measured at a wavelength of 587.56 nm. d And, when measured at 25℃, it was 5.3 g / cm³. 3 The density d below RT It has the following characteristics. In some examples, the above glass has a refractive index n of 1.95 to 2.0 when measured at a wavelength of 587.56 nm. d And, when measured at 25℃, it was 4.3 g / cm³. 3 ~5.3g / cm 3 density d RT It has the following characteristics.

[0101] In some embodiments, the glass of the present disclosure is of formula (I)(a):

[0102]

number

[0103] Refractive index n according to d and density d RT It can be characterized as follows, where refractive index n d It was measured at a wavelength of 587.56 nm, and the density d RT g / cm³ at 25℃ 3 It is measured in units of [unit].

[0104] In some embodiments, the glass of the present disclosure is of formula (I)(b):

[0105]

number

[0106] Refractive index n according to d and density d RT It can be characterized by the refractive index n d It was measured at a wavelength of 587.56 nm, and the density was g / cm³ at 25°C. 3 It is measured in units of [unit].

[0107] In some embodiments, the glass is characterized by high transmittance. Generally, the higher the transmittance of glass, the longer the path that light travels at a given optical loss, which can improve optical performance in many applications. High refractive index glass typically includes species such as TiO2 and Nb2O5 that absorb at least a portion of light, particularly light in the blue and near-UV regions of the electromagnetic spectrum. In embodiments of this disclosure, the transmittance of glass may be characterized with respect to several different wavelengths in the range of about 300 nm to 2300 nm. In some applications, high transmittance in the visible and near-UV ranges (blue region) is particularly desirable. Achieving high transmittance in the blue region with high refractive index glass can be difficult. High levels of TiO2 and / or Nb2O5, which are typically used in glass to increase the refractive index, tend to reduce transmittance in the near-UV region and shift the UV cutoff to higher wavelengths. In the case of blue light, the internal transmittance (considering Fresnel loss) can be considered acceptable if the internal transmittance of a 10 mm thick sample at a wavelength of 460 nm is 90% or higher, good if it is 95% or higher, and excellent if it is 97% or higher.

[0108] In some embodiments, the glass is of formula (II)(a):

[0109]

number

[0110] A refractive index n that satisfies the conditions d (measured at 587.56nm) and transmittance index T i This is a characteristic feature, where the transmittance index T i Equation (III):

[0111]

number

[0112] Determined according to, each oxide listed in formula (III) refers to the amount of oxide expressed in mol% in the above glass. Transmittance index T i is the molar ratio of the colorless refractive index increasing agents La2O3, Gd2O3, and ZrO2 to the total of the five refractive index increasing agents La2O3, Gd2O3, ZrO2, Nb2O5, and TiO2. T i The amount of has been found to correlate with the transmittance of blue light of the high refractive index and low density glass of the present disclosure.

[0113] Figure 1 shows the transmittance index T according to formula (III) i and the quantity λ 70% The relationship between is shown. This quantity λ 70% represents the minimum wavelength corresponding to a total transmittance of 70% or more for a plate-like glass sample with a thickness of 10 mm. λ 70% The fact that the value of is small generally corresponds to a large wavelength range in which the glass sample has a high internal transmittance, so the fact that the value of λ 70% is small generally corresponds to a high transmittance of the entire glass sample. The data points in Figure 1 correspond to the data obtained from U.S. Patent No. 8,728,963 and U.S. Patent No. 9,643,880. The R value shown on the graph corresponds to the Pearson correlation coefficient. U.S. Patent No. 9,643,880 reports the glass composition in terms of cation percent. To calculate the transmittance index T i in mol% according to formula (III), it was assumed that the cation percent value was equal to the atomic percent of atoms excluding oxygen, and the cation percent value was converted to the molar percent of oxygen and applied to formula (III). As shown in Figure 1, this data demonstrates the correlation between the quantity λ 70% and the transmittance index T i .

[0114] In some embodiments, the above glass has the formula (IV):

[0115]

Number

[0116] Refractive index n satisfying d (measured at 587.56 nm) and transmittance index T i may be characterized.

[0117] In some embodiments, the glass has a transmittance index T determined according to formula (III) that is 0.25 or more and 0.75 or less, and all ranges and sub-ranges between the above values i [mol% / mol%]. In some embodiments, the glass composition has a transmittance index T of 0.25 or more, 0.30 or more, 0.40 or more, 0.485 or more, 0.50 or more, 0.52 or more, 0.532 or more, 0.55 or more, 0.60 or more, or 0.70 or more i [mol% / mol%]. In some other embodiments, the glass composition has a transmittance index T of 0.75 or less, 0.70 or less, 0.60 or less, 0.50 or less i [mol% / mol%]. In some further embodiments, the glass composition has a transmittance index T of 0.25 - 0.75, 0.25 - 0.60, 0.25 - 0.40, 0.30 - 0.60, 0.30 - 0.50, 0.40 - 0.60, 0.50 - 0.75, 0.60 - 0.75, 0.60 - 0.70, 0.38 - 0.65, 0.39 - 0.74, or 0.50 - 0.71 i [mol% / mol%]. In some embodiments, in some concentration ranges, it has been found that values of the transmittance index Ti of 0.532 or more correspond to an acceptably high internal transmittance of approximately 95% or more in the visible range for a glass sample with a thickness of 10 mm.

[0118] In some embodiments, the relationship between the refractive index nd and the density d RT is characterized using the ratio (n d -1) / d RT Here, the refractive index n d is measured at 587.56 nm, and the density is measured in g / cm 3 at 25°C as the unit. (n d -1) / d RTThe ratio is also called "refraction" or "refractive value". At a given density, the higher the refractive value, the higher the refractive index.

[0119] In some embodiments, the glass has the formula (V):

[0120]

Number

[0121] satisfies the refractive index n d (measured at 587.56 nm), density d RT (measured at 25 °C), and transmission index T i and is well characterized, where the transmission index T i is determined according to the above formula (III).

[0122] The refractive index, density, and refraction are properties that can be predicted from the glass composition. A linear regression analysis of the glass of the comparative example near the glass composition space of the examples of the present disclosure was performed to determine the composition dependence of the refractive index n d at a wavelength of 587.56 nm, the composition dependence of the density of the glass (g / cm 3 ) at 25 °C, and the composition dependence of the refraction of the glass, and equations for prediction were determined. The following equations (VI), (VII), and (VIII) were obtained from the linear regression analysis and were used for predicting the refractive index, density, and refraction of the glass, respectively:

[0123]

Number

[0124] where P n is the refractive index parameter for predicting the refractive index n d of the glass at a wavelength of 587.56 nm, and P d is the density parameter for predicting the density of the glass (g / cm 3 ) at 2 °C based on the glass composition, and P refThe refractive parameter predicts the refractive index of the glass based on the glass composition, and each oxide listed in formulas (VI), (VII), and (VIII) refers to the amount of the oxide expressed in mol% in the above glass.

[0125] Table 1 below identifies the concentration limits from which formulas (VI), (VII), and (VIII) were derived. The linear regression analysis used to determine formulas (VI), (VII), and (VIII) randomly selected glasses for use as a training data set to advance the regression and also selected glasses for use as a validation data set to evaluate the ability to perform interpolation within the pre-defined composition limits (shown in Table 1 below). A training data set of glass compositions that meet the criteria specified in Table 1 below and have measured values of the properties of interest, approximately 100 glass compositions for each property, was randomly selected from the literature data presented in the publicly available SciGlass Information System database and from the example glasses of the embodiments presented herein. Formulas (VI), (VII), and (VIII) were determined using the linear regression analysis of the data sets specified above, and insignificant variables and outliers were excluded. The resulting formulas (VI), (VII), and (VIII) are presented in Table 2 below. Another portion of glass compositions that meet the same criteria was used as a validation set to evaluate the ability to perform interpolation within the pre-defined composition limits. This corresponds to the standard deviation specified in Table 2. This also evaluated the ability to predict specific properties outside the specified composition limits with reasonable accuracy using an external data set of prior art glass compositions, also randomly selected from the SciGlass Information System database. This process was repeated multiple times to determine the best variant of each property of interest corresponding to the above regression formulas specified in Table 2.

[0126] [Table 1]

[0127] [Table 2]

[0128] Figure 2 shows the density parameter P for several comparative example glasses ("Comp. Glass") and example glass ("Ex. Glass") d The measured refractive index n as a function of d Measured density d RT (Measured at 25°C, g / cm³) 3 This is a plot of the refractory density parameter P. As shown by the data in Figure 2, the refractory density parameter P d The composition dependence of the measured density d is as follows for most glasses. RT ±0.12 g / cm³ 3 The error was within the range of [value]. Figure 3 shows the refractive index parameter P for several comparative example glasses ("Comp. Glass") and example glass ("Ex. Glass"). n The measured refractive index n as a function of d This is a plot of the (measured at 587.56 nm) values. As shown by the data in Figure 3, the refractive index parameter P n The composition dependence of the measured refractive index n is as follows for most glasses. d The error was within the range of ±0.019 units. Figure 4 shows the measured refractive index n for several comparative example glasses ("Comp. Glass") and example glass ("Ex. Glass"). d (Measured at 587.56 nm) minus 1, and the measured density d RT (Measured at 25°C, g / cm³) 3 ) ratio, (n d -1) / d RT The refraction parameter P ref This is a plot of the refractive parameter P as a function of the data in Figure 4. ref The composition dependence of the measured refractive index was within an error range of ±0.003 units for most of the glass.

[0129] The concentration limits representing some embodiments of this disclosure are specified in Tables 3-5 below.

[0130] According to another embodiment of this disclosure, the glass of the present invention is of formula (IX) and (X):

[0131]

number

[0132] Refractive index parameter P that satisfies one or more of the following conditions n and density parameter P d It can have, where P n P is the refractive index parameter determined according to equation (VI), and d is the density parameter determined according to equation (VII). According to another embodiment of the present disclosure, the glass of the present invention comprises one or more of the formulas (XI)(a) and (XI)(b):

[0133]

number

[0134] Refractive index parameter P that satisfies this condition n and transmittance index T i It can have, where P n is the refractive index parameter determined according to equation (VI), and T i This is the transmittance index determined according to equation (III).

[0135] According to one embodiment of this disclosure, the glass of the present invention is of formula (XII):

[0136]

number

[0137] Refractive index parameter P that satisfies this condition ref and transmittance index T i It can have, where P refis the refractive parameter determined according to formula (VIII), and T i is the transmittance index determined according to formula (III).

[0138] In some embodiments, the glass can be characterized by good glass-forming ability, which can be evaluated as resistance to devitrification during cooling. As described above, the glass-forming ability can be numerically measured by determining the critical cooling rate of the melt, i.e., the minimum cooling rate at which the melt forms a glass without crystallization. According to one embodiment, the glass may be characterized by a critical cooling rate of 300 °C / min or less, and in some examples, 100 °C / min or less. In some embodiments, the glass of the present disclosure can be characterized in that it can be cooled from 1100 °C to 500 °C in 2.5 minutes without crystallization in air. The glass characterized by this glass-forming ability can cope with the press molding process.

[0139] Glass A of an example of the present disclosure according to some embodiments of the present disclosure is shown in Table 3 below. Table 3 specifies combinations of components and the amounts of each component according to some embodiments of the present disclosure. Glass A of the examples in Table 3 may contain additional components according to any aspect of the present disclosure described herein in an amount of 0.5 mol% or less.

[0140] [Table 3]

[0141] Glass A of the examples in Table 3 may also have a ratio of SiO2 / (B2O3 + SiO2), expressed in mol% of each oxide, that is 0.05 or more and 0.95 or less.

[0142] Glass A of an example according to some embodiments of the present disclosure may also have a transmittance index T of 0.532 or more i where the transmittance index T i is determined according to formula (III).

[0143] Glass A in some embodiments is also (IX) and (X):

[0144]

number

[0145] One or more of the following conditions may be met, where P n P is the refractive index parameter determined according to equation (VI), and d is the density parameter determined according to equation (VII).

[0146] Glass A in some embodiments is also derived from formulas (I)(a) and (I)(b):

[0147]

number

[0148] It is acceptable to satisfy one or more of the following conditions, where n d This is the refractive index measured at 587.56 nm, and d RT This is the density (g / cm³) measured at 25℃. 3 )

[0149] Examples of Glass B of the Disclosure in some embodiments of the Disclosure are shown in Table 4 below. Table 4 specifies the combinations of components and the amounts of each component in some embodiments of the Disclosure. The Examples of Glass B in Table 4 may contain additional components in any embodiment of the Disclosure described herein in an amount of 0.5 mol% or less.

[0150] [Table 4]

[0151] Glass B in the examples of Table 4 may contain fluorine in an amount of 0.0 to 1.0 atomic percent. In some embodiments, glass B in the examples of Table 4 may contain a total of 50.0 mol% or less of (SiO2 + B2O3).

[0152] Glass B in some embodiments of the present disclosure may have a total of (SiO2 + B2O3 + Alk2O + MgO + CaO + SrO + BaO + ZnO) of 69.0 mol% or less, where Alk2O is the total content of alkali metal oxides. Glass B in some embodiments may also have 25.0 mol% or more of (RE m O n The sum of (+TiO2+Nb2O5+ZrO2+Bi2O3+WO3) may be, where RE m O n This represents the total content of rare earth metal oxides. In some embodiments, the example glass B may also contain a total of 8.5 mol% or more of divalent metal oxides RO.

[0153] Glass B in some embodiments is given by formulas (XI)(a) and (XI)(b):

[0154]

number

[0155] One or more of the following conditions may be met, where P n is the refractive index parameter determined according to equation (VI), and T i This is the transmittance index determined according to equation (III).

[0156] Glass B in some embodiments also contains one or more of the formulas (II)(a) and (II)(b):

[0157]

number

[0158] It is sufficient that the following conditions be met, where nd This is the refractive index measured at 587.56 nm, and T i This is the transmittance index determined according to equation (III).

[0159] Examples of glass C of the present disclosure according to several embodiments of the present disclosure are shown in Table 5 below. Table 5 specifies combinations of components and the amounts of each component according to certain embodiments of the present disclosure. The examples of glass C in Table 5 may include additional components according to any aspect of the present disclosure described herein.

[0160] [Table 5]

[0161] The glass C in the examples in Table 5 may contain fluorine in an amount of 0.0 to 1.0 atomic percent. In some embodiments, the glass C in the examples in Table 5 may contain a total of 45.0 mol% or less of (SiO2 + B2O3). The glass C in the examples in Table 5 may contain a total of 2.0 mol% or less of (Y2O3 + ZnO).

[0162] In some embodiments, the example glass C may contain a total content of divalent metal oxide (RO) in an amount of 0.0 mol% to 25.0 mol%. In some embodiments, the example glass C may contain a total content of monovalent metal oxide (R2O) in an amount of 0.0 mol% to 15.0 mol%.

[0163] The glass C in the embodiment according to the present disclosure has a transmittance index T of 0.25 to 0.75. i It may have equation (XII):

[0164]

number

[0165] It is sufficient that the conditions are met, where P ref is the refractive parameter determined according to equation (VIII), and T iThis is the transmittance index determined according to equation (III).

[0166] In some embodiments, the glass C of the embodiment is also of formula (V):

[0167]

number

[0168] It is sufficient that the following conditions be met, where n d This is the refractive index measured at 587.56 nm, and T i This is the transmittance index determined according to equation (III).

[0169] Embodiments of this disclosure have high transmittance, particularly for blue light, and a high refractive index n of 1.80 or higher. d , and (when measured at 25°C) 5.5 g / cm³ 3 Glass can be provided that has the following densities. In some embodiments, the glass of this disclosure has a density of equivalent value and refractive index n d This can provide improved glass-forming properties compared to some conventional diatomaceous borate glass with high transmittance. In some embodiments, the glass has an equivalent refractive index n d Compared to conventional glass with the same and / or density characteristics, it can provide equivalent or improved transmittance of light in the visible spectrum.

[0170] The transmittance of glass may, at least in part, depend on the constituent elements and / or process used to form the glass. Under manufacturing conditions where process parameters have already been determined / optimized, the transmittance of glass is essentially component-dependent. While we do not wish to be bound by any theory, it is thought that components such as TiO2 and Nb2O5 may reduce the blue light transmittance of glass, especially when used in high concentrations. However, the refractive index of glass can be increased by using components such as TiO2 and Nb2O5 without the corresponding undesirable increase in glass density. Therefore, in some embodiments, components such as TiO2 and Nb2O5 can be added at concentrations that match the desired refractive index and density, still providing glass with an acceptable level of blue light transmittance. The refractive index of the glass of the present invention can also be increased using other oxides such as ZrO2, La2O3, Gd2O3, and possibly other rare earth metal oxides. It has been shown that by adding these oxides, glass with a desirable blue light transmittance can be produced. However, these oxides can also increase density, which may be undesirable in some applications. Some of these oxides, at high concentrations, may also reduce the glass-forming properties of the composition. For example, these oxides may increase the liquidus temperature and / or precipitate a crystalline phase containing these oxides from the glass molten material at high temperatures. Among the oxides, ZrO2, La2O3, Gd2O3, TiO2, and Nb2O5, ZrO2 have been observed to have the greatest effect on the liquidus temperature in some compositions, while simultaneously having the least effect on the blue light transmittance of the glass. Therefore, attempts to increase the refractive index and / or decrease density may have undesirable effects on the glass-forming properties of the composition. Embodiments of this disclosure provide a high refractive index n, which is desirable in many applications, such as augmented reality devices, virtual reality devices, mixed reality devices, and / or eyewear. d This allows us to provide glass that offers an acceptable balance between density (measured at 25°C) and blue light transmittance characteristics. [Examples]

[0171] The following examples illustrate the various features and advantages provided by this disclosure and are not intended to limit the scope of the invention or the appended claims in any way.

[0172] All of the example and comparative example glasses were prepared by melting relatively pure oxide materials. Table 6 below lists typical tramp elements found in some of the oxides used in the preparation of the example and comparative example glasses described herein.

[0173] [Table 6]

[0174] To prepare the glass samples, approximately 15 grams of each sample (containing over 99.99% by weight of the target species) from the batch raw materials were melted in a platinum or platinum-rhodium crucible ((Pt:Rh=80:20)) at approximately 1300°C for 1 hour. Two controlled cooling conditions were applied. Under the first condition (referred to as the "15-minute test"), it took approximately 15 minutes to cool the sample from 1100°C to 500°C in the furnace. Under the second condition (referred to as the "2.5-minute test"), it took approximately 2.5 minutes to cool the sample from 1100°C to 500°C. Temperature readings were obtained by direct reading of the furnace temperature or using an IR camera with calibration scaling. The first condition (15-minute test) roughly corresponds to a maximum cooling rate of 300°C / min at 1000°C (around this temperature, the cooling rate approaches its maximum), and the second test condition (2.5-minute test) roughly corresponds to a maximum cooling rate of 600°C / min at 1000°C. As the temperature decreases, the cooling rate also decreases significantly. Typical schedules for the first and second cooling systems are shown in Figure 5. Chemical analysis was not performed on the tested samples. This is because chemical analysis was performed on similar samples prepared as separate melts using the XRF method (X-ray fluorescence, all oxides except B2O3) and the ICP method (inductively coupled plasma mass spectrometry, B2O3). These analyses yielded deviations of within ±2.0 mass% from the batch composition for major components such as Nb2O5, which are similarly present in amounts of less than approximately 1 mol%.

[0175] Table 7 below lists the glass compositions and properties of Glass 1 to 78 of the examples according to embodiments of the present disclosure. Table 7 includes observations from three devitrification tests: “Devitrification Test 1,” “Devitrification Test 2,” and “Devitrification Test 3.” “Devitrification Test 1” refers to the results of observations of a glass sample melted in a 1-liter crucible under an optical microscope (magnification 100 to 500 times). The abbreviations “A,” “B,” “C,” and “D” are used as follows: No evidence of crystallization (“A”); A very small number of crystals were found under a microscope in only one or two spots in the glass and only on the surface, but more than 98% of the surface was crystal-free (“B”); There were many more crystals on the surface, but more than 90% of the glass surface was crystal-free (“C”); There were some crystals in most of the crucible, and less than 90% of the glass surface was crystal-free (“D”). “Devitrification Test 2” refers to the “15-minute test” cooling procedure described above, and “OK” is used to indicate that the glass composition passed this test. "Devitrification Test 3" refers to the "2.5-minute test" cooling procedure described above, and "OK" in the observation is used to indicate that the glass composition passed this test.

[0176] [Table 7-1]

[0177] [Table 7-2]

[0178] [Table 7-3]

[0179] [Table 7-4]

[0180] [Table 7-5]

[0181] [Table 7-6]

[0182] [Table 7-7]

[0183] [Table 7-8]

[0184] [Table 7-9]

[0185] [Table 7-10]

[0186] Table 8 below lists the glass compositions and properties of comparative examples C1 to C32.

[0187] [Table 8-1]

[0188] [Table 8-2]

[0189] [Table 8-3]

[0190] [Table 8-4]

[0191] The reference keys for each of the comparative example glasses listed in Table 8 are as follows: [1] China Patent No. 110510869 (CDGM GLASS CO LTD); [2] France Patent No. 1214486A (LEITZ GMBH ERNST); [3] US Registered Patent No. 10287205B2 (CDGM GLASS CO LTD); [4] US Published Patent No. 2004220041 (Hikari Glass Co., Ltd.); [5] US Patent No. 4584279A (SCHOTT GLASWERKE); [6] US Patent No. 5288669A (CORNING INC); [7] US Patent No. 6121176A (CORNING INC); [8] US Registered Patent No. 7490485B2 (HOYA Corporation); [9] US Registered Patent No. 9018116B2 (SCHOTT AG);

[10] U.S. Registered Patent No. 9302930B2 (HOYA Corporation);

[11] U.S. Registered Patent No. 9394194B2 (HOYA Corporation);

[12] U.S. Registered Patent No. 9643880B2 (HOYA Corporation);

[13] International Publication No. 2006106781 (Nippon Sheet Glass Co., Ltd.);

[14] International Publication No. 2012099168A1 (Ohara Corporation);

[15] International Publication No. 2017110304A1 Figure 6 is a plot showing the total transmittance τ as a function of wavelength for several examples of glass, Examples 1-4. Transmittance was measured using a 2 mm thick glass sample with a Cary 5000 spectrophotometer using an integrating sphere, at wavelengths of 250 nm to 2500 nm, and a resolution of 1 nm. As shown in Figure 6, some of the glasses in the above examples have λ less than 400 nm. 70% In some cases, λ less than 390nm or less than 380nm 70% This indicates.

[0192] Figure 7 shows the density parameter P for some of the example glasses and some of the comparative example glasses. d and refractive index parameter P n This plot shows the relationship between the two. The glasses in the above-mentioned examples (black circles) are Examples 1-5 and 38-50 from Table 7. The glasses in the above-mentioned comparative examples (white circles) are Comparative Examples C1-C7 from Table 8. Refractive index parameter Pn This predicts the refractive index at 587.56 nm and was determined according to equation (VI). Density parameter P d This predicts the density at room temperature and was determined according to formula (VII). All example and comparative example glasses shown in Figure 7 have the characteristics specified in Table 9 below. In Table 9, if an entry "No restrictions" exists, this refers to restrictions that were not considered when selecting the composition. In Figure 7, some of the compositions listed above may be labeled for improved visibility.

[0193] [Table 9]

[0194] The comparative example glasses listed above are known glasses having the characteristics specified in Table 9, with equivalent density parameter P values. d And the highest refractive index parameter P n It has been selected as having [a certain characteristic].

[0195] The line corresponding to the equation y = 1.00 + 0.19*x shown in Figure 7 provides a visual representation of the difference between the comparative example glass having the characteristics specified in Table 9 and the examples 1-5 and 38-50 of this disclosure. As can be seen in Figure 7, above the line y = 1.00 + 0.19*x, there are the examples of the above-mentioned glass shown in Figure 7 (black circles), but not the comparative example glass (white circles). Here, y is the refractive index parameter P n Corresponding to this, x is the density parameter P d This corresponds to the following equation (IX):

[0196]

number

[0197] Some of the glass in the examples shown in Figure 7 satisfy this condition, while the glass in the comparative examples does not.

[0198] As can also be seen in Figure 7, some of the glasses from the examples shown in Figure 7 are above the line y = 1.03 + 0.19*x, while none of the glasses from the comparative examples are above it. Here, y is the refractive index parameter P. n Corresponding to this, x is the density parameter P d This corresponds to equation (IX):

[0199]

number

[0200] The glass in the above-described embodiment shown in Figure 7 satisfies this condition, while the glass in the comparative example does not.

[0201] The data shown in Figure 7 indicates that, under the conditions specified in Table 9 above, some of the glasses of the examples from this disclosure exhibited equivalent density parameter P compared to the best of the comparative example glasses meeting the same conditions. d At a higher refractive index parameter P n This indicates that the glass in these examples has a density d measured at 25°C that is equivalent to that of the glass described above. RT (g / cm 3 The refractive index n was measured at the highest value of 587.56 nm in ) d This can be interpreted as meaning that it is predicted to have a value of n. In other words, the glass of the embodiment shown in Figure 7 has a high refractive index n among the known glasses having the characteristics specified in Table 9. d and low density d at room temperature RT This is expected to provide improved combinations.

[0202] Figure 8 shows the density d for some of the example glasses and some of the comparative example glasses. RT (Measured at 25°C, g / cm³) 3 ) and refractive index n dThis plot shows the relationship between (measured at 587.56 nm). The example glasses (black circles) described above are Examples 1-5 from Table 7. The comparative example glasses (white circles) described above are Comparative Examples C1, C3, C4, and C7-C11 from Table 8. All example and comparative example glasses shown in Figure 8 have the characteristics specified in Table 10 below. In Table 10, if an entry "No restrictions" exists, this refers to restrictions that were not considered when selecting the composition. In Figure 8, some of the compositions listed above may be labeled for improved visibility.

[0203] [Table 10]

[0204] The comparative example glass listed above is one of the known glasses having the above-described characteristics specified in Table 10, with a density d of equivalent value. RT (Measured at 25°C, g / cm³) 3 ) and the highest refractive index n d It was selected as having a measured value (measured at 587.56 nm).

[0205] The line corresponding to the equation y = 1.00 + 0.19*x shown in Figure 8 provides a visual representation of the difference between the comparative example glass having the characteristics specified in Table 10 and the examples 1-5 of this disclosure. As can be seen in Figure 8, above the line y = 1.00 + 0.19*x, there are the examples glass (black circles) shown in Figure 8, but not the comparative example glass (white circles). Here, y is n d Corresponding to x is d RT This corresponds to the following equation (I)(a):

[0206]

number

[0207] Some of the glass in the examples shown in Figure 8 satisfy this condition, while the glass in the comparative example does not.

[0208] As can also be seen in Figure 8, some of the glass from the embodiment shown in Figure 8 is above the line y = 1.03 + 0.19*x, while none of the glass from the comparative example is above it. Here, y is n d Corresponding to x is d RT This corresponds to equation (I)(b):

[0209]

number

[0210] The glass in the above-described embodiment shown in Figure 8 satisfies this condition, while the glass in the comparative example does not.

[0211] The data shown in Figure 8 indicates that, under the conditions specified in Table 10 above, some of the glasses of the examples from this disclosure have equivalent density d to the best of the comparative example glasses meeting the same conditions. RT (Measured at 25°C, g / cm³) 3 ) In the measurement of higher refractive index n d This indicates that the measured value is (measured at 587.56 nm). This means that, according to the measured properties, the glass of these examples has an equivalent value of d among the glasses described above. RT The highest n d It can be interpreted that it has the value of . In other words, the glass of the embodiment shown in Figure 8, according to the measured properties, has a density d among the known glasses having the characteristics specified in Table 10. RT and refractive index n d This provides an improvement in combination with [the other element].

[0212] The predicted and measured characteristic data shown in Figures 7 and 8 respectively indicate that the glass of several embodiments from this disclosure has a refractive index n compared to the best of the comparative glass having the characteristics specified in Tables 9 and 10. d (Measured at 587.56 nm) and density d RT (Measured at 25°C, g / cm³) 3 This demonstrates that it has a better combination with ).

[0213] Tables 9 and 10, as well as the values ​​of all attributes specified by formulas (IX), (X), (I)(a), and (I)(b) for comparative example glasses C1 to C11 plotted in Figures 7 and 8, are shown in Table 11 below. The complete compositions of the comparative example glasses are shown in Table 8. The complete compositions and attributes of the examples of glasses from this disclosure are shown in Table 7.

[0214] [Table 11-1]

[0215] [Table 11-2]

[0216] Figure 9 shows the transmittance index T for some of the example glasses and some of the comparative example glasses. i and refractive index parameter P n This plot shows the relationship between the two. The glasses in the above-mentioned examples (black circles) are Examples 1 and 46-73 from Table 7. The glasses in the above-mentioned comparative examples (white circles) are comparative examples C23-C30 from Table 8. Refractive index parameter P n The refractive index n at 587.56 nm is n d This predicts the transmittance index T, which was determined according to equation (VI). i This was determined according to formula (III). All of the example and comparative example glasses shown in Figure 9 have the characteristics specified in Table 12 below. In Table 12, if an entry “No restrictions” exists, this refers to restrictions that were not considered when selecting the composition. In Figure 9, some of the compositions listed above may be labeled for improved visibility.

[0217] [Table 12]

[0218] The comparative example glass listed above is one of the known glasses having the characteristics specified in Table 12, with a transmittance index T of equivalent value. i And the highest refractive index parameter P n It has been selected as having [a certain characteristic].

[0219] The line corresponding to the equation y = 2.055 - 0.36*x shown in Figure 9 provides a visual representation of the difference between the comparative example glass having the characteristics specified in Table 12 and the examples 1 and 46-73 of the present disclosure. As can be seen in Figure 9, above the line y = 2.055 - 0.36*x, there are the examples of the above-mentioned glass shown in Figure 9 (black circles), but not the comparative example glass (white circles). Here, y is the refractive index parameter P n Corresponding to this, x is the transmittance index T i This corresponds to the following equation (XI)(a):

[0220]

number

[0221] Some of the glass in the examples shown in Figure 9 satisfy this condition, while the glass in the comparative examples does not.

[0222] As can also be seen in Figure 9, some of the glasses from the examples shown in Figure 9 are above the line y = 2.1 - 0.36*x, while none of the glasses from the comparative examples are above it. Here, y is the refractive index parameter P. n Corresponding to this, x is the transmittance index T i This corresponds to equation (XI)(b):

[0223]

number

[0224] The glass in the above-described embodiment shown in Figure 9 satisfies this condition, while the glass in the comparative example does not.

[0225] The data shown in Figure 9 indicates that, under the conditions specified in Table 12 above, some of the glasses of the examples from this disclosure exhibited equivalent transmittance index T than the best of the comparative example glasses meeting the same conditions. i At a higher refractive index parameter P n This indicates that the glass in these examples has a transmittance index T of an equivalent value among the glasses described above. i The refractive index n is highest at 587.56 nm. d This can be interpreted as meaning that it is predicted to have a value of T. In other words, the glass of the embodiment shown in Figure 9 is one of the known glasses having the characteristics specified in Table 12, with a transmittance index T. i and refractive index n d This is expected to provide improved combinations.

[0226] Figure 10 shows the transmittance index T for some of the example glasses and some of the comparative example glasses. i and the refractive index n measured at 587.56 nm d (This is a plot showing the relationship between the two. The example glass (black circle) above is Example 1 from Table 7. The comparative example glass (white circle) above is Comparative Examples C23-C27, C29, C31, and C32 from Table 8. All example and comparative example glasses shown in Figure 10 have the characteristics specified in Table 13 below. In Table 13, if there is an entry "No restrictions", this refers to restrictions that were not considered when selecting the composition. In Figure 10, some of the compositions listed above may be labeled for improved visibility.

[0227] [Table 13]

[0228] The comparative example glass listed above is one of the known glasses having the characteristics described above as specified in Table 13, with an equivalent transmittance index T. i The refractive index n was measured at the highest value of 587.56 nm. dIt has been selected as having the following measurement values.

[0229] The line corresponding to the equation y = 2.055 - 0.36*x shown in Figure 10 provides a visual representation of the difference between the comparative example glass having the characteristics specified in Table 13 and glass 1 of the embodiment according to this disclosure. As can be seen in Figure 10, above the line y = 2.055 - 0.36*x, there is the glass of the embodiment described above (black circle) shown in Figure 10, but not the comparative example glass (white circle). Here, y is the refractive index n d Corresponding to this, x is the transmittance index T i This corresponds to the following equation (II)(a):

[0230]

number

[0231] Some of the glass in the examples shown in Figure 10 satisfy this condition, while the glass in the comparative example does not.

[0232] As can also be seen in Figure 10, some of the glass from the examples shown in Figure 10 are above the line y = 2.1 - 0.36*x, while none of the glass from the comparative example is above it. Here, y is the refractive index n d Corresponding to this, x is the transmittance index T i This corresponds to equation (II)(b):

[0233]

number

[0234] The glass in the above-described embodiment shown in Figure 10 satisfies this condition, while the glass in the comparative example does not.

[0235] The data shown in Figure 10 indicates that, under the conditions specified in Table 13 above, some of the glasses of the examples from this disclosure exhibited equivalent transmittance index T than the best of the comparative example glasses meeting the same conditions. iThe refractive index n measured at a higher 587.56 nm in the measurement was d This indicates that, according to the measured properties, the glass of these examples has a transmittance index T of an equivalent value among the glasses described above. i The highest refractive index n d This can be interpreted as having a value of . In other words, the glass of the embodiment shown in Figure 10, according to the measured properties, has a transmittance index T among the known glasses having the characteristics specified in Table 13. i and refractive index n d This provides an improvement in combination with [the other element].

[0236] Tables 12 and 13, as well as the values ​​of all attributes specified by formulas (XI)(a), (XI)(b), (II)(a), and (II)(b) for comparative example glasses C23 to C32 plotted in Figures 9 and 10, are shown in Table 14 below. The complete compositions of the comparative example glasses are shown in Table 8. The complete compositions and attributes of the examples of glasses from this disclosure are shown in Table 7.

[0237] [Table 14-1]

[0238] [Table 14-2]

[0239] The predictive and measured characteristic data shown in Figures 9 and 10, respectively, indicate that the glass of several embodiments from this disclosure exhibits a transmittance index T compared to the best of the comparative glass having the characteristics specified in Tables 12 and 13. i and the refractive index n measured at 587.56 nm d This demonstrates that it has a better combination with [the other party].

[0240] Figure 11 shows the transmittance index T for some of the example glasses and some of the comparative example glasses. iand the refractive parameter P ref This plot shows the relationship between the two. The glasses in the above-mentioned examples (black circles) are examples 6 to 37 from Table 7. The glasses in the above-mentioned comparative examples (white circles) are comparative examples C12 to C19 from Table 8. Refractive parameter P ref is, (n d -1) / d RT This predicts the ratio ("refraction"), where n d This is the refractive index measured at 587.56 nm, and d RT The density (g / cm³) was measured at 25°C. 3 ) was determined according to formula (VIII). All example and comparative example glasses shown in Figure 11 have the characteristics specified in Table 15 below. In Table 15, if an entry “No restrictions” exists, this refers to restrictions that were not considered when selecting the composition. In Figure 11, some of the compositions listed above may be labeled for improved visibility.

[0241] [Table 15]

[0242] The comparative example glasses listed above are known glasses having the characteristics specified in Table 15, with equivalent transmittance index T values. i And the highest refractive parameter P ref It has been selected as having [a certain characteristic].

[0243] The line corresponding to the equation y = 0.262 - 0.115*x shown in Figure 11 provides a visual representation of the difference between the comparative example glass having the characteristics specified in Table 15 and the examples 6-37 of this disclosure. As can be seen in Figure 11, above the line y = 0.262 - 0.115*x, there are the examples of the above-mentioned glass shown in Figure 11 (black circles), but not the comparative example glass (white circles). Here, y is the refractive parameter P ref Corresponding to this, x is the transmittance index T i This corresponds to the following equation (XII):

[0244]

number

[0245] Some of the glass in the examples shown in Figure 11 satisfy this condition, while the glass in the comparative example does not.

[0246] The data shown in Figure 11 indicates that, under the conditions specified in Table 15 above, some of the glasses of the examples from this disclosure exhibited equivalent transmittance index T than the best of the comparative example glasses meeting the same conditions. i At a higher value of the refractive parameter P ref This indicates that the glass in these examples has a transmittance index T of an equivalent value among the glasses described above. i The highest density d RT Refractive index n d ratio d RT (n d -1) / d RT This can be interpreted as meaning that it is predicted to have a value of ("refractive index"). In other words, the glass in the embodiment of Figure 11 is one of the known glasses having the characteristics specified in Table 15, with a transmittance index T i This is expected to provide an improvement in the combination of refraction.

[0247] Figure 12 shows the transmittance index T for some of the example glasses and some of the comparative example glasses. i and ratio (n d -1) / d RT This plot shows the relationship between ("refraction") and, where n d This is the refractive index measured at 587.56 nm, and d RT The density (g / cm³) was measured at 25°C. 3) The example glasses (black circles) described above are Examples 6, 7, and 18 from Table 7. The comparative example glasses (white circles) described above are Comparative Examples C3, and C19-C22 from Table 8. All example and comparative example glasses shown in Figure 12 have the characteristics specified in Table 16 below. In Table 16, if there is an entry "No restrictions", this refers to restrictions that were not considered when selecting the composition. In Figure 12, some of the compositions listed above may be labeled for improved visibility.

[0248] [Table 16]

[0249] The comparative example glass listed above is one of the known glasses having the characteristics described above as specified in Table 16, with an equivalent transmittance index T. i And the highest density d RT Refractive index n d The ratio (n d -1) / d RT It has been selected as having (refraction) measurement values.

[0250] The line corresponding to the equation y = 0.262 - 0.115*x shown in Figure 12 provides a visual representation of the difference between the comparative example glass having the characteristics specified in Table 16 and the examples 6, 7, and 18 of this disclosure. As can be seen in Figure 12, above the line y = 0.262 - 0.115*x, there are the examples of the above-mentioned glass shown in Figure 12 (black circles), but not the comparative example glass (white circles). Here, y is the ratio (n d -1) / d RT (Refraction) corresponds to x, where x is the transmittance index T i This corresponds to the following equation (V):

[0251]

number

[0252] Some of the glass in the examples shown in Figure 12 satisfy this condition, while the glass in the comparative example does not.

[0253] The data shown in Figure 12 indicates that, under the conditions specified in Table 16 above, some of the glasses of the examples from this disclosure exhibited equivalent transmittance index T than the best of the comparative example glasses meeting the same conditions. i In the measured values, the ratio (n d -1) / d RT This indicates that the (refractive) measurement is present. This means that, according to the measured properties, the glass of these examples has an equivalent T value among the glasses described above. i The highest ratio (n d -1) / d RT This can be interpreted as having a value of . In other words, the glass of the embodiment shown in Figure 12, according to the measured properties, has a transmittance index T among the known glasses having the characteristics specified in Table 16. i and refraction ((n d -1) / d RT It provides an improvement in the combination with the ratio of .

[0254] Tables 15 and 16, and the values ​​of all attributes specified by formulas (XII) and (V) for comparative example glasses C3 and C12-C22 plotted in Figures 11 and 12, are shown in Table 17 below. The complete compositions of the comparative example glasses are shown in Table 8. The complete compositions and attributes of the examples of glasses from this disclosure are shown in Table 7.

[0255] [Table 17-1]

[0256] [Table 17-2]

[0257] The predicted and measured characteristic data shown in Figures 11 and 12 indicate that the glass of several embodiments from this disclosure has a refractive index ((n) higher than the best of the comparative example glass having the characteristics specified in Tables 15 and 16. d -1) / d RT (ratio) and transmittance index T i It is confirmed that it has an improved combination with [the other component].

[0258] The following non-limiting aspects are included in this disclosure. Additional aspects may be formed by combining, in part or in whole, any one of the features of the first through twenty-six aspects, to the extent not yet described, with any one of the features of any one of the other aspects of this disclosure, even if such combinations are not expressly described.

[0259] According to a first aspect of this disclosure, the glass is: 9.0 mol% to 33.0 mol% of B2O3; 15.0 mol% to 50.0 mol% of La2O3; and more than 0.0 mol% of SiO2, provided that the ratio of SiO2 (expressed in mol%) to the total (SiO2 / (SiO2+B2O3)) of SiO2 and B2O3 (expressed in mol%) is 0.05 to 0.95; and also contains Nb2O5, TiO2, ZrO2, Y2O3, Li2O, Ta2O5, Al2O3, BaO, Bi2O3, CaO, Er2O3, Gd2O3, K2O, Na2O, Nd2O3, and P The glass contains at least one oxide selected from 2O5, PbO, TeO2, WO3, Y2O3, Yb2O3, and ZnO, subject to the following conditions: Nb2O5 is 0.0 mol% to 12.0 mol%, TiO2 is 0.0 mol% to 40.0 mol%, ZrO2 is 0.0 mol% to 13.5 mol%, Y2O3 is 0.0 mol% to 3.0 mol%, ZnO is 0.0 mol% to 0.8 mol%, Li2O is 0.0 mol% to 0.5 mol%, and Ta2O5 is 0.0 mol% to 1.5 mol%, and the above glass is formulated according to formula (IX):

[0260]

number

[0261] Refractive index parameter P that satisfies this condition n and density parameter P d It has the above refractive index parameter P n Equation (VI):

[0262]

number

[0263] It is calculated according to, The above density parameter P d Equation (VII):

[0264]

number

[0265] It is calculated according to, Furthermore, the above glass has a transmittance index T of 0.532 or higher. i It has the above transmittance index T i Equation (III):

[0266]

number

[0267] The calculation is performed according to the formulas (VI), (VII), and (III), where each oxide listed in formulas (VII), (VII), and (III) refers to the amount of oxide in the glass, expressed in mole percent.

[0268] According to a second aspect of this disclosure, in the glass described in aspect 1, the glass is of formula (I)(a):

[0269]

number

[0270] Refractive index n satisfying the condition d and density d RT It has the above refractive index n dIt was measured at a wavelength of 587.56 nm, and the above density d RT g / cm³ at 25℃ 3 It is measured in units of [unit].

[0271] According to a third aspect of this disclosure, in the glass described in aspect 1 or aspect 2, the transmittance index T i It is 0.550 or higher.

[0272] According to a fourth aspect of this disclosure, in the glass described in any one of aspects 1 to 3, the glass contains 0.3 mol% to 30.0 mol% of SiO2.

[0273] According to a fifth aspect of this disclosure, the glass described in any one of aspects 1 to 4 comprises at least one of: 0.3 mol% to 40.0 mol% of TiO2; 0.3 mol% to 10.0 mol% of ZrO2; and 0.3 mol% to 12.0 mol% of Nb2O5.

[0274] According to a sixth aspect of this disclosure, the glass described in any one of aspects 1 to 5 comprises at least one of the following: 0.0 mol% to 30.0 mol% of CaO; 0.0 mol% to 10.0 mol% of BaO; 0.0 mol% to 10.0 mol% of WO3; 0.0 mol% to 5.0 mol% of Na2O; 0.0 mol% to 5.0 mol% of K2O; and 0.0 mol% to 7.5 mol% of SrO.

[0275] According to the seventh aspect of this disclosure, the glass described in any one of aspects 1 to 6 is characterized in that it can be cooled in air from 1100°C to 500°C in 2.5 minutes without crystallization.

[0276] According to the eighth aspect of this disclosure, in the glass described in any one of aspects 1 to 7, the glass has a refractive index n of 1.95 or higher when measured at a wavelength of 587.56 nm. d When measured at 25℃, the concentration is 5.3 g / cm³. 3 The density d below RT It has the following characteristics.

[0277] According to the ninth aspect of this disclosure, the glass contains: 3.0 mol% or more of SiO2; 1.0 mol% or more of B2O3, provided that the total of (SiO2 + B2O3) is 48.0 mol% or less; a total content of 8.5 mol% or more of divalent metal oxides (RO); and Nb2O5, TiO2, ZrO2, Y2O3, Li2O, Ta2O5, Al2O3, BaO, Bi2O3, CaO, Er2O3, Gd2O 3. Selected from K2O, Na2O, Nd2O3, P2O5, PbO, TeO2, WO3, Y2O3, Yb2O3, and ZnO, with Gd2O3 being 0.0 mol% to 27.0 mol%, CaO being 0.0 mol% to 32.0 mol%, Li2O being 0.0 mol% to 7.0 mol%, MgO being 0.0 mol% to 5.0 mol%, and Y2O3 being 0.0 mol% to 1.5 mol%. The percentages are as follows: Ta2O5 is 0.0 mol% to 0.5 mol%, BaO is 0.0 mol% to 14.0 mol%, CdO is 0.0 mol% to 10.0 mol%, Bi2O3 is 0.0 mol% to 20.0 mol%, PbO is 0.0 mol% to 1.0 mol%, HfO2 is 0.0 mol% to 1.0 mol%, TeO2 is 0.0 mol% to 5.0 mol%, and Nb2O5 is The total content of (SiO2 + B2O3 + Alk2O + MgO + CaO + SrO + BaO + ZnO) is 0.0 mol% to 25.0 mol%, TiO2 is 0.0 mol% to 18.0 mol%, ZnO is 0.0 mol% to 2.0 mol%, and fluorine is 0.0 atom% to 1.0 atom%. The total content of (SiO2 + B2O3 + Alk2O + MgO + CaO + SrO + BaO + ZnO) is 69.0 mol% or less, where Alk2O is the total content of alkali metal oxides. (RE m O n The total of (TiO2 + Nb2O5 + ZrO2 + Bi2O3 + WO3) is 25.0 mol% or more, and here RE m O n The glass contains at least one oxide, subject to the condition that is the total content of rare earth metal oxides, and furthermore, the glass is of formula (XI)(a):

[0278]

number

[0279] Refractive index parameter P that satisfies this condition nand transmittance index T i It has the above refractive index parameter P n Equation (VI):

[0280]

number

[0281] It is calculated according to, Above transmittance index T i Equation (III):

[0282]

number

[0283] The calculation is performed according to the formula, and each oxide listed in formulas (VI) and (III) refers to the amount of oxide in the glass, expressed in mole percent.

[0284] According to the tenth aspect of this disclosure, in the glass described in aspect 9, the glass has a refractive index n measured at a wavelength of 587.56 nm. d The glass has the following properties:

[0285]

number

[0286] It satisfies the condition.

[0287] According to the eleventh aspect of this disclosure, in the glass described in aspect 9, the glass is of formula (I)(a):

[0288]

number

[0289] Refractive index n satisfying the condition d and density d RT It has the above refractive index n dIt was measured at a wavelength of 587.56 nm, and the above density d RT g / cm³ at 25℃ 3 It is measured in units of [unit].

[0290] According to a twelfth aspect of this disclosure, the glass described in any one of aspects 9 to 11 comprises: 3.0 mol% to 45.0 mol% of SiO2; and 1.0 mol% to 45.0 mol% of B2O3.

[0291] According to a thirteenth aspect of this disclosure, the glass described in any one of aspects 9 to 12 comprises at least one of: 0.0 mol% to 22.0 mol% of Nb2O5; 0.3 mol% to 30.0 mol% of La2O3; 0.0 mol% to 15.0 mol% of Gd2O3; and 0.0 mol% to 10.0 mol% of Bi2O3.

[0292] According to the 14th aspect of this disclosure, in the glass described in any one of aspects 9 to 13, the total (Na2O + K2O) content of the glass is 0.0 mol% to 10.0 mol%.

[0293] According to a 15th aspect of this disclosure, the glass described in any one of aspects 9 to 14 comprises at least one of: 0.3 mol% to 18.0 mol% of TiO2; 0.3 mol% to 10.0 mol% of ZrO2; 0.3 mol% to 15.0 mol% of Nb2O5; 0.0 mol% to 10.0 mol% of WO3; 0.0 mol% to 5.0 mol% of Na2O; 0.0 mol% to 5.0 mol% of K2O; 0.0 mol% to 7.5 mol% of SrO; and 0.0 mol% to 4.0 mol% of Li2O.

[0294] According to the sixteenth aspect of this disclosure, the glass described in any one of aspects 9 to 15 is characterized in that the glass can be cooled in air from 1100°C to 500°C in 2.5 minutes without crystallization.

[0295] According to the 17th aspect of this disclosure, in the glass described in any one of aspects 9 to 16, the glass has a refractive index n of 1.95 or greater when measured at a wavelength of 587.56 nm. d When measured at 25℃, the concentration is 5.3 g / cm³. 3 The density d below RT It has the following characteristics.

[0296] According to the 18th embodiment of this disclosure, the glass is selected from: 1.0 mol% to 40.0 mol% of TiO2; 1.0 mol% to 29.0 mol% of B2O3; 0.0 mol% to 32.0 mol% of SiO2, where the total of (SiO2 + B2O3) is 45.0 mol% or less; and Nb2O5, ZrO2, La2O3, Y2O3, Li2O, Al2O3, BaO, Bi2O3, CaO, Er2O3, Gd2O3, Na2O, Nd2O3, P2O5, PbO, WO3, Y2O3, Yb2O3, and ZnO, where La2O3 is 0.0 mol% to 30.0 mol%, ZrO2 is 0.0 mol% to 7.8 mol%, and Nb2O5 is 0.0 The glass contains at least one oxide that conforms to the following conditions: the total content is 0.0 mol% to 7.0 mol%, CaO is 0.0 mol% to 15.0 mol%, BaO is 0.0 mol% to 15.0 mol%, Li2O is 0.0 mol% to 3.5 mol%, GeO2 is 0.0 mol% to 10.0 mol%, Al2O3 is 0.0 mol% to 10.0 mol%, fluorine is 0.0 atom% to 1.0 atom%, the total (Y2O3 + ZnO) is 0.0 mol% to 2.0 mol%, the total content of divalent metal oxides (RO) is 0.0 mol% to 40.0 mol%, and the total content of monovalent metal oxides (R2O) is 0.0 mol% to 15.0 mol%. Furthermore, the glass has a transmittance index T of 0.25 to 0.75. i The glass has the following properties:

[0297]

number

[0298] Refraction parameter P that satisfies this condition ref and transmittance index T i It has the above refractive parameter P refEquation (VIII):

[0299]

number

[0300] It is calculated according to, Above transmittance index T i Equation (III):

[0301]

number

[0302] The calculation is performed according to the formula (VIII) and formula (III), where each oxide listed in formula (VIII) and formula (III) refers to the amount of oxide in the glass, expressed in mole percent.

[0303] According to the 19th aspect of this disclosure, in the glass described in aspect 18, the glass has a refractive index n measured at a wavelength of 587.56 nm. d , and density d measured at 25℃ RT (g / cm 3 ) has, and the above glass further has formula (V):

[0304]

number

[0305] It satisfies the condition.

[0306] According to the 20th aspect of this disclosure, in the glass described in aspect 18 or aspect 19, the glass has a transmittance index T of 0.485 or higher. i It holds.

[0307] According to the 21st aspect of this disclosure, in the glass described in any one of aspects 18 to 20, the glass has a refractive index n measured at a wavelength of 587.56 nm. d The glass has the following properties:

[0308]

number

[0309] It satisfies the condition.

[0310] According to the 22nd aspect of this disclosure, in the glass described in any one of aspects 18 to 21, the glass contains 0.3 mol% to 30.0 mol% of SiO2.

[0311] According to the 23rd aspect of this disclosure, in the glass described in any one of aspects 18 to 22, the glass comprises at least one of: 0.3 mol% to 30.0 mol% of La2O3; 0.3 mol% to 7.8 mol% of ZrO2; and 0.3 mol% to 7.0 mol% of Nb2O5.

[0312] According to the 24th aspect of this disclosure, the glass described in any one of aspects 18 to 23 comprises at least one of: 0.0 mol% to 10.0 mol% of BaO; 0.0 mol% to 10.0 mol% of WO3; 0.0 mol% to 5.0 mol% of Na2O; 0.0 mol% to 5.0 mol% of K2O; 0.0 mol% to 7.5 mol% of SrO; and 0.0 mol% to 3.0 mol% of Y2O3.

[0313] According to the 25th aspect of this disclosure, the glass described in any one of aspects 18 to 24 is characterized in that the glass can be cooled in air from 1100°C to 500°C in 2.5 minutes without crystallization.

[0314] According to the 26th aspect of this disclosure, in the glass described in any one of aspects 18 to 25, the glass has a refractive index n of 1.95 or greater when measured at a wavelength of 587.56 nm. d When measured at 25℃, the concentration is 5.3 g / cm³. 3 The following measured density d RT It has the following characteristics.

[0315] Numerous modifications and alterations may be made to the embodiments described herein without substantially departing from the spirit and various principles of this disclosure. All such modifications and alterations are intended to be incorporated herein within the scope of this disclosure and are protected by the following claims.

[0316] To the extent not yet described, multiple features from various aspects of this disclosure may be used in combination with each other as needed. The absence of a particular feature in relation to each aspect of this disclosure is not intended to be interpreted as meaning that the feature cannot exist, but is done for clarity and conciseness. Thus, multiple features from different aspects may be mixed or adapted as needed to form new aspects, regardless of whether these new aspects are explicitly disclosed.

[0317] Preferred embodiments of the present invention are described below in separate sections.

[0318] Embodiment 1 9.0 mol% to 33.0 mol% B2O3; 15.0 mol% to 50.0 mol% of La2O3; SiO2 greater than 0.0 mol%, where the ratio of SiO2 (expressed in mol%) to the total of SiO2 and B2O3 (expressed in mol%) (SiO2 / (SiO2+B2O3)) is 0.05-0.95; and At least one oxide selected from Nb2O5, TiO2, ZrO2, Y2O3, Li2O, Ta2O5, Al2O3, BaO, Bi2O3, CaO, Er2O3, Gd2O3, K2O, Na2O, Nd2O3, P2O5, PbO, TeO2, WO3, Y2O3, Yb2O3, and ZnO, The Nb2O5 content is between 0.0 mol% and 12.0 mol%. The concentration of TiO2 is between 0.0 mol% and 40.0 mol%. The ZrO2 content is between 0.0 mol% and 13.5 mol%, The amount of Y2O3 is between 0.0 mol% and 3.0 mol%, The ZnO content is 0.0 mol% to 0.8 mol%, The amount of Li2O is 0.0 mol% to 0.5 mol%, The concentration of Ta2O5 is between 0.0 mol% and 1.5 mol%. At least one oxide that satisfies the following condition Glass containing, The above glass is given by formula (IX):

[0319]

number

[0320] Refractive index parameter P that satisfies this condition n and density parameter P d It has the above refractive index parameter P n Equation (VI):

[0321]

number

[0322] It is calculated according to, The above density parameter P d Equation (VII):

[0323]

number

[0324] It is calculated according to, Furthermore, the above glass has a transmittance index T of 0.532 or higher. i It has the above transmittance index T i Equation (III):

[0325]

number

[0326] A glass calculated according to the formulas (VI), (VII), and (III), where each oxide listed in formulas (VI), (VII), and (III) refers to the amount of oxide in the glass, expressed in mole percent.

[0327] Embodiment 2 The above glass is given by formula (I)(a):

[0328]

number

[0329] Refractive index n satisfying the condition d and density d RT It has the above refractive index n d It was measured at a wavelength of 587.56 nm, and the above density d RT g / cm³ at 25℃ 3 The glass according to Embodiment 1, measured in units of [unit].

[0330] Embodiment 3 Above transmittance index T i The glass according to Embodiment 1 or 2, wherein the coefficient is 0.550 or higher.

[0331] Embodiment 4 The above glass is the glass according to any one of Embodiments 1 to 3, containing 0.3 mol% to 30.0 mol% of SiO2.

[0332] Embodiment 5 The above glass is: 0.3 mol% to 40.0 mol% TiO2; 0.3 mol% to 10.0 mol% of ZrO2; and 0.3 mol% to 12.0 mol% Nb2O5 A glass according to any one of embodiments 1 to 4, comprising at least one of the following.

[0333] Embodiment 6 The above glass is: 0.0 mol% to 30.0 mol% CaO; 0.0 mol% to 10.0 mol% BaO; 0.0 mol% to 10.0 mol% WO3; 0.0 mol% to 5.0 mol% Na2O; 0.0 mol% to 5.0 mol% of K2O; and 0.0 mol% to 7.5 mol% SrO A glass according to any one of embodiments 1 to 5, comprising at least one of the following.

[0334] Embodiment 7 The glass described above is characterized in that it can be cooled in air from 1100°C to 500°C in 2.5 minutes without crystallization, as described in any one of Embodiments 1 to 6.

[0335] Embodiment 8 The above glass has a refractive index n of 1.95 or higher when measured at a wavelength of 587.56 nm. d When measured at 25℃, the concentration is 5.3 g / cm³. 3 The density d below RT A glass according to any one of embodiments 1 to 7, having the following characteristics.

[0336] Embodiment 9 SiO2 of 3.0 mol% or more; B2O3 of 1.0 mol% or more, provided that the total of (SiO2 + B2O3) is 48.0 mol% or less; Total content of divalent metal oxides (RO) of 8.5 mol% or more; and At least one oxide selected from Nb2O5, TiO2, ZrO2, Y2O3, Li2O, Ta2O5, Al2O3, BaO, Bi2O3, CaO, Er2O3, Gd2O3, K2O, Na2O, Nd2O3, P2O5, PbO, TeO2, WO3, Y2O3, Yb2O3, and ZnO, The amount of Gd2O3 is between 0.0 mol% and 27.0 mol%, The amount of CaO ranges from 0.0 mol% to 32.0 mol%. The amount of Li2O is between 0.0 mol% and 7.0 mol%, The MgO content is between 0.0 mol% and 5.0 mol%. The amount of Y2O3 is between 0.0 mol% and 1.5 mol%, The amount of Ta2O5 is 0.0 mol% to 0.5 mol%, The BaO content is between 0.0 mol% and 14.0 mol%, The CdO content is between 0.0 mol% and 10.0 mol%, The Bi2O3 content is between 0.0 mol% and 20.0 mol%. The PbO content is 0.0 mol% to 1.0 mol%, The HfO2 content is between 0.0 mol% and 1.0 mol%. TeO2 is present in amounts ranging from 0.0 mol% to 5.0 mol%, The concentration of Nb2O5 is between 0.0 mol% and 25.0 mol%. The TiO2 content is between 0.0 mol% and 18.0 mol%, The ZnO content is 0.0 mol% to 2.0 mol%, Fluorine content is between 0.0 atomic% and 1.0 atomic%, The total of (SiO2 + B2O3 + Alk2O + MgO + CaO + SrO + BaO + ZnO) is 69.0 mol% or less, where Alk2O is the total content of alkali metal oxides, ( RE m O n The total of (TiO2 + Nb2O5 + ZrO2 + Bi2O3 + WO3) is 25.0 mol% or more, and here RE m O n This is the total content of rare earth metal oxides. At least one oxide that satisfies the following condition Glass containing, Furthermore, the above glass is given by formula (XI)(a):

[0337]

number

[0338] Refractive index parameter P that satisfies this condition n and transmittance index T i It has the above refractive index parameter P n Equation (VI):

[0339]

number

[0340] It is calculated according to, Above transmittance index T i Equation (III):

[0341]

number

[0342] A glass calculated according to the formula, where each oxide listed in formulas (VI) and (III) refers to the amount of oxide in the glass, expressed in mole percent.

[0343] Embodiment 10 The above glass has a refractive index n measured at a wavelength of 587.56 nm. d The glass has the following properties:

[0344]

number

[0345] The glass according to embodiment 9, which satisfies the requirements.

[0346] Embodiment 11 The above glass is given by formula (I)(a):

[0347]

number

[0348] Refractive index n satisfying the condition d and density d RT It has the above refractive index n d It was measured at a wavelength of 587.56 nm, and the above density d RT g / cm³ at 25℃ 3 The glass according to Embodiment 9, measured in units of .

[0349] Embodiment 12 The glass described above is the glass according to any one of Embodiments 9 to 11, comprising: 3.0 mol% to 45.0 mol% of SiO2; and 1.0 mol% to 45.0 mol% of B2O3.

[0350] Embodiment 13 The above glass is: 0.0 mol% to 22.0 mol% Nb2O5; 0.3 mol% to 30.0 mol% of La2O3; 0.0 mol% to 15.0 mol% of Gd2O3; and 0.0 mol% to 10.0 mol% Bi2O3 The glass according to any one of embodiments 9 to 12, comprising at least one of the above.

[0351] Embodiment 14 The glass described above is the glass according to any one of Embodiments 9 to 13, wherein the total amount of (Na2O + K2O) is 0.0 mol% to 10.0 mol%.

[0352] Embodiment 15 The above glass is: 0.3 mol% to 18.0 mol% TiO2; 0.3 mol% to 10.0 mol% ZrO2; 0.3 mol% to 15.0 mol% Nb2O5; 0.0 mol% to 10.0 mol% WO3; 0.0 mol% to 5.0 mol% Na2O; 0.0 mol% to 5.0 mol% K2O; 0.0 mol% to 7.5 mol% of SrO; and 0.0 mol% to 4.0 mol% Li2O The glass according to any one of embodiments 9 to 14, comprising at least one of the above.

[0353] Embodiment 16 The glass described above is characterized in that it can be cooled in air from 1100°C to 500°C in 2.5 minutes without crystallization, as described in any one of embodiments 9 to 15.

[0354] Embodiment 17 The above glass has a refractive index n of 1.95 or higher when measured at a wavelength of 587.56 nm. d When measured at 25℃, the concentration is 5.3 g / cm³. 3 The density d below RT A glass according to any one of embodiments 9 to 16, having the following characteristics.

[0355] Embodiment 18 1.0 mol% to 40.0 mol% TiO2; 1.0 mol% to 29.0 mol% of B2O3; SiO2 in an amount of 0.0 mol% to 32.0 mol%, provided that the total of (SiO2 + B2O3) is 45.0 mol% or less; and At least one oxide selected from Nb2O5, ZrO2, La2O3, Y2O3, Li2O, Al2O3, BaO, Bi2O3, CaO, Er2O3, Gd2O3, Na2O, Nd2O3, P2O5, PbO, WO3, Y2O3, Yb2O3, and ZnO, La2O3 is present in amounts ranging from 0.0 mol% to 30.0 mol%. The ZrO2 content is 0.0 mol% to 7.8 mol%, The Nb2O5 content is between 0.0 mol% and 7.0 mol%. The amount of CaO is between 0.0 mol% and 15.0 mol%, The BaO content is between 0.0 mol% and 15.0 mol%, The amount of Li2O is between 0.0 mol% and 3.5 mol%, GeO2 is present in amounts ranging from 0.0 mol% to 10.0 mol%, Al2O3 is present in amounts ranging from 0.0 mol% to 10.0 mol%. Fluorine content is 0.0 atomic% to 1.0 atomic%, The total amount of (Y2O3 + ZnO) is between 0.0 mol% and 2.0 mol%, The total content of divalent metal oxides (RO) ranges from 0.0 mol% to 40.0 mol%. The total content of monovalent metal oxides (R2O) is between 0.0 mol% and 15.0 mol%. At least one oxide that satisfies the following condition Glass containing, Furthermore, the above glass has a transmittance index T of 0.25 to 0.75. i The glass has the following properties:

[0356]

number

[0357] Refraction parameter P that satisfies this condition ref and transmittance index T i It has the above refractive parameter P ref Equation (VIII):

[0358]

number

[0359] It is calculated according to, Above transmittance index T i Equation (III):

[0360]

number

[0361] A glass calculated according to formula (VIII) and formula (III), where each oxide listed in formula (VIII) and (III) refers to the amount of oxide in the glass, expressed in mole percent.

[0362] Embodiment 19 The above glass has a refractive index n measured at a wavelength of 587.56 nm. d , and density d measured at 25℃ RT (g / cm 3 ) has, and the above glass further has formula (V):

[0363]

number

[0364] The glass according to embodiment 18, which satisfies the requirements.

[0365] Embodiment 20 The above glass has a transmittance index T of 0.485 or higher. i The glass according to embodiment 18 or 19, having the following features.

[0366] Embodiment 21 The above glass has a refractive index n measured at a wavelength of 587.56 nm. d The glass has the following properties:

[0367]

number

[0368] A glass according to any one of embodiments 18 to 20, satisfying the requirements.

[0369] Embodiment 22 The glass described above is the glass according to any one of embodiments 18 to 21, containing 0.3 mol% to 30.0 mol% of SiO2.

[0370] Embodiment 23 The above glass is: 0.3 mol% to 30.0 mol% of La2O3; 0.3 mol% to 7.8 mol% of ZrO2; and 0.3 mol% to 7.0 mol% Nb2O5 The glass according to any one of embodiments 18 to 22, comprising at least one of the above.

[0371] Embodiment 24 The above glass is: 0.0 mol% to 10.0 mol% BaO; 0.0 mol% to 10.0 mol% WO3; 0.0 mol% to 5.0 mol% Na2O; 0.0 mol% to 5.0 mol% K2O; 0.0 mol% to 7.5 mol% of SrO; and 0.0 mol% to 3.0 mol% Y2O3 The glass according to any one of embodiments 18 to 23, comprising at least one of the above.

[0372] Embodiment 25 The glass described above is characterized in that it can be cooled in air from 1100°C to 500°C in 2.5 minutes without crystallization, as described in any one of embodiments 18 to 24.

[0373] Embodiment 26 The above glass has a refractive index n of 1.95 or higher when measured at a wavelength of 587.56 nm. d When measured at 25℃, the concentration is 5.3 g / cm³. 3 The following measured density d RT A glass according to any one of embodiments 18 to 25, having the following characteristics.

[0374] Embodiment 27 9.0 mol% to 33.0 mol% B2O3; 15.0 mol% to 50.0 mol% of La2O3; SiO2 greater than 0.0 mol%, where the ratio of SiO2 (expressed in mol%) to the total of SiO2 and B2O3 (expressed in mol%) (SiO2 / (SiO2+B2O3)) is 0.05-0.95; and At least one oxide selected from Nb2O5, TiO2, ZrO2, Y2O3, Li2O, Ta2O5, Al2O3, BaO, Bi2O3, CaO, Er2O3, Gd2O3, K2O, Na2O, Nd2O3, P2O5, PbO, TeO2, WO3, Y2O3, Yb2O3, and ZnO, The Nb2O5 content is between 0.0 mol% and 12.0 mol%. The concentration of TiO2 is between 0.0 mol% and 40.0 mol%. The ZrO2 content is between 0.0 mol% and 13.5 mol%, The amount of Y2O3 is between 0.0 mol% and 3.0 mol%, The ZnO content is 0.0 mol% to 0.8 mol%, The amount of Li2O is 0.0 mol% to 0.5 mol%, The concentration of Ta2O5 is between 0.0 mol% and 1.5 mol%. At least one oxide that satisfies the following condition Glass containing, The aforementioned glass is given by formula (IX):

[0375]

number

[0376] Refractive index parameter P that satisfies this condition n and density parameter P d It has the refractive index parameter P n Equation (VI):

[0377]

number

[0378] It is calculated according to, The density parameter P d Equation (VII):

[0379]

number

[0380] It is calculated according to, Furthermore, the glass has a transmittance index T of 0.532 or higher. i It has the transmittance index T i Equation (III):

[0381]

number

[0382] A glass calculated according to formulas (VI), (VII), and (III), where each oxide listed in formulas (VI), (VII), and (III) refers to the amount of oxide in the glass, expressed in mole percent.

[0383] Embodiment 28 The glass according to Embodiment 27, characterized in that the glass can be cooled in air from 1100°C to 500°C in 2.5 minutes without crystallization.

[0384] Embodiment 29 The glass has a refractive index n of 1.95 or higher when measured at a wavelength of 587.56 nm. d When measured at 25℃, the concentration is 5.3 g / cm³. 3 The density d below RT The glass according to embodiment 27 or 28, having the above.

[0385] Embodiment 30 SiO2 of 3.0 mol% or more; B2O3 of 1.0 mol% or more, provided that the total of (SiO2 + B2O3) is 48.0 mol% or less; Total content of divalent metal oxides (RO) of 8.5 mol% or more; and At least one oxide selected from Nb2O5, TiO2, ZrO2, Y2O3, Li2O, Ta2O5, Al2O3, BaO, Bi2O3, CaO, Er2O3, Gd2O3, K2O, Na2O, Nd2O3, P2O5, PbO, TeO2, WO3, Y2O3, Yb2O3, and ZnO, The amount of Gd2O3 is between 0.0 mol% and 27.0 mol%, The amount of CaO ranges from 0.0 mol% to 32.0 mol%. The amount of Li2O is between 0.0 mol% and 7.0 mol%, The MgO content is between 0.0 mol% and 5.0 mol%. The amount of Y2O3 is between 0.0 mol% and 1.5 mol%, The amount of Ta2O5 is 0.0 mol% to 0.5 mol%, The BaO content is between 0.0 mol% and 14.0 mol%, The CdO content is between 0.0 mol% and 10.0 mol%, The Bi2O3 content is between 0.0 mol% and 20.0 mol%. The PbO content is 0.0 mol% to 1.0 mol%, The HfO2 content is between 0.0 mol% and 1.0 mol%. TeO2 is present in amounts ranging from 0.0 mol% to 5.0 mol%, The concentration of Nb2O5 is between 0.0 mol% and 25.0 mol%. The TiO2 content is between 0.0 mol% and 18.0 mol%, The ZnO content is 0.0 mol% to 2.0 mol%, Fluorine content is between 0.0 atomic% and 1.0 atomic%, The total of (SiO2 + B2O3 + Alk2O + MgO + CaO + SrO + BaO + ZnO) is 69.0 mol% or less, where Alk2O is the total content of alkali metal oxides, ( RE m O n The total of (TiO2 + Nb2O5 + ZrO2 + Bi2O3 + WO3) is 25.0 mol% or more, and here RE m O n This is the total content of rare earth metal oxides. At least one oxide that satisfies the following condition Glass containing, Furthermore, the glass is given by formula (XI)(a):

[0386]

number

[0387] Refractive index parameter P that satisfies this condition n and transmittance index T i It has the refractive index parameter P n Equation (VI):

[0388]

number

[0389] It is calculated according to, The transmittance index T i Equation (III):

[0390]

number

[0391] A glass calculated according to the formula, where each oxide listed in formulas (VI) and (III) refers to the amount of oxide in the glass, expressed in mole percent.

[0392] Embodiment 31 The aforementioned glass is given by formula (I)(a):

[0393]

number

[0394] Refractive index n satisfying the condition d and density d RT It has the refractive index n d It was measured at a wavelength of 587.56 nm, and the density d RT g / cm³ at 25℃ 3 The glass according to embodiment 30, measured in units of .

[0395] Embodiment 32 The glass has a refractive index n of 1.95 or higher when measured at a wavelength of 587.56 nm. d When measured at 25℃, the concentration is 5.3 g / cm³. 3 The density d below RT The glass according to embodiment 30 or 31, having the above.

[0396] Embodiment 33 1.0 mol% to 40.0 mol% TiO2; 1.0 mol% to 29.0 mol% of B2O3; SiO2 in an amount of 0.0 mol% to 32.0 mol%, provided that the total of (SiO2 + B2O3) is 45.0 mol% or less; and At least one oxide selected from Nb2O5, ZrO2, La2O3, Y2O3, Li2O, Al2O3, BaO, Bi2O3, CaO, Er2O3, Gd2O3, Na2O, Nd2O3, P2O5, PbO, WO3, Y2O3, Yb2O3, and ZnO, La2O3 is present in amounts ranging from 0.0 mol% to 30.0 mol%, The ZrO2 content is between 0.0 mol% and 7.8 mol%, The Nb2O5 content is between 0.0 mol% and 7.0 mol%. The amount of CaO is between 0.0 mol% and 15.0 mol%, The BaO content is between 0.0 mol% and 15.0 mol%, The amount of Li2O is between 0.0 mol% and 3.5 mol%, GeO2 is present in amounts ranging from 0.0 mol% to 10.0 mol%, Al2O3 is present in amounts ranging from 0.0 mol% to 10.0 mol%, Fluorine content is between 0.0 atomic% and 1.0 atomic%, The total amount of (Y2O3 + ZnO) is between 0.0 mol% and 2.0 mol%, The total content of divalent metal oxides (RO) ranges from 0.0 mol% to 40.0 mol%. The total content of monovalent metal oxides (R2O) is between 0.0 mol% and 15.0 mol%. At least one oxide that satisfies the following condition Glass containing, Furthermore, the glass has a transmittance index T of 0.25 to 0.75. i The glass has the formula (XII):

[0397]

number

[0398] Refraction parameter P that satisfies this condition ref and transmittance index T i It has the refractive parameter P ref Equation (VIII):

[0399]

number

[0400] It is calculated according to, The transmittance index T i Equation (III):

[0401]

number

[0402] A glass calculated according to formula (VIII) and formula (III), where each oxide listed in formula (VIII) and formula (III) refers to the amount of oxide in the glass, expressed in units of mole percent.

[0403] Embodiment 34 The aforementioned glass has a refractive index n measured at a wavelength of 587.56 nm. d , and density d measured at 25℃ RT (g / cm 3 ) has, and the glass further comprises formula (V):

[0404]

number

[0405] The glass according to embodiment 33, which satisfies the requirements.

[0406] Embodiment 35 The aforementioned glass has a refractive index n measured at a wavelength of 587.56 nm. d The glass has, and furthermore, formula (IV):

[0407]

number

[0408] A glass according to embodiment 33 or 34 that satisfies the requirements.

[0409] Embodiment 36 The glass has a refractive index n of 1.95 or higher when measured at a wavelength of 587.56 nm. d When measured at 25℃, the concentration is 5.3 g / cm³. 3 The following measured density d RT A glass according to any one of embodiments 33 to 35, having the following characteristics.

Claims

1. 3.0 mol% or more of SiO ２ , 1.0 mol% or more of B ２ O ３ However (SiO ２ +B ２ O ３ The total of ) is 48.0 mol% or less. The total content of divalent metal oxides (RO) of 8.5 mol% or more, and Nb ２ O ５ 、TiO ２ 、ZrO ２ 、Y ２ O ３ 、Li ２ O、Ta ２ O ５ 、Al ２ O ３ 、BaO、Bi ２ O ３ 、CaO、Er ２ O ３ 、Gd ２ O ３ 、K ２ O、Na ２ O、Nd ２ O ３ 、P ２ O ５ 、PbO、TeO ２ 、WO ３ 、Y ２ O ３ 、Yb ２ O ３ 、and at least one oxide selected from ZnO, Gd ２ O ３ The range is 0.0 mol% to 27.0 mol%, The CaO content ranges from 0.0 mol% to 32.0 mol%, Li ２ O is between 0.0 mol% and 7.0 mol%, The MgO content is between 0.0 mol% and 5.0 mol%. Y ２ O ３ It is between 0.0 mol% and 1.5 mol%, Ta ２ O ５ It is between 0.0 mol% and 0.5 mol%, The BaO content is between 0.0 mol% and 14.0 mol%, The CdO content is between 0.0 mol% and 10.0 mol%, Bi ２ O ３ The amount is between 0.0 mol% and 20.0 mol%, The PbO content is between 0.0 mol% and 1.0 mol%, HfO ２ It is between 0.0 mol% and 1.0 mol%, TeO ２ The amount is between 0.0 mol% and 5.0 mol%, Nb ２ O ５ The range is 0.0 mol% to 25.0 mol%, TiO ２ The amount ranges from 0.0 mol% to 18.0 mol%, The ZnO content is between 0.0 mol% and 2.0 mol%, The fluorine content is between 0.0 atomic% and 1.0 atomic%. (SiO ２ +B ２ O ３ +Alk ２ The total of (O + MgO + CaO + SrO + BaO + ZnO) is 69.0 mol% or less, where Alk ２ O is the total content of alkali metal oxides, (RE ｍ O ｎ +TiO ２ +Nb ２ O ５ +ZrO ２ +Bi ２ O ３ +WO ３ The total of ) is 25.0 mol% or more, and here RE ｍ O ｎ This is the total content of rare earth metal oxides. At least one oxide that satisfies the following condition Glass containing, Furthermore, the glass is given by formula (XI)(a): [Math 1] Refractive index parameter P that satisfies this condition ｎ and transmittance index T ｉ It has the above refractive index parameter P ｎ Equation (VI): [Math 2] It is calculated according to, The above transmittance index T ｉ は, formula (III): [Math 3] A glass calculated according to formula (VI) and formula (III), where each oxide listed in formula (VI) and formula (III) refers to the amount of oxide in the glass, expressed in units of mole percent.

2. Refractive index n measured at a wavelength of 587.56 nm ｄ It has, and furthermore, formula (II)(a): [Math 4] The glass according to claim 1, satisfying the requirements.

3. Equation (I)(a): [Math 5] Refractive index n satisfying this condition ｄ and density d ＲＴ It has, where the refractive index n ｄ It was measured at a wavelength of 587.56 nm, and the density d ＲＴ g / cm³ at 25℃ ３ The glass according to claim 1, measured in units of [unit].

4. 3.0 mol% to 45.0 mol% SiO ２ , and 1.0 mol% to 45.0 mol% of B ２ O ３ including, The glass according to any one of claims 1 to 3.

5. 0.0 mol% to 22.0 mol% Nb ２ O ５ , 0.3 mol% to 30.0 mol% La ２ O ３ , 0.0 mol% to 15.0 mol% of Gd ２ O ３ , and 0.0 mol% to 10.0 mol% of Bi ２ O ３ The glass according to any one of claims 1 to 3, comprising at least one of the following.

6. (Na ２ O+K ２ The glass according to any one of claims 1 to 3, wherein the total of O) is 0.0 mol% to 10.0 mol%.

7. 0.3 mol% to 18.0 mol% TiO ２ , 0.3 mol% to 10.0 mol% of ZrO ２ , 0.3 mol% to 15.0 mol% Nb ２ O ５ , 0.0 mol% to 10.0 mol% WO ３ , 0.0 mol% to 5.0 mol% Na ２ O, 0.0 mol% to 5.0 mol% K ２ O, 0.0 mol% to 7.5 mol% of SrO, 0.0 mol% to 4.0 mol% Li ２ O The glass according to any one of claims 1 to 3, comprising at least one of the following.

8. The glass according to any one of claims 1 to 3, characterized in that it can be cooled in air from 1100°C to 500°C in 2.5 minutes without crystallization.

9. A refractive index n of 1.95 or more when measured at a wavelength of 587.56 nm ｄ and a density d of 5.3 g / cm ３ or less when measured at 25°C ＲＴ The glass according to any one of claims 1 to 3, having such properties.

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