glass

Abstract

A glass composition which comprises main components consisting of, in % by mass: 50-80% of TeO2; 0-30% of Bi2O3; 0-30% of WO3; 0-30% of ZnO; 0-30% of BaO; 0-30% of GeO2; and 0-30% of Ga2O3, and to which at least one of the following elements to be added is introduced: 1-1000 mg / kg of Si4+; 1-1000 mg / kg of B3+; 1-1000 mg / kg of P5+; 1-1000 mg / kg of Li+; 1-1000 mg / kg of Na+; 1-1000 mg / kg of K+; 1-1000 mg / kg of Mg2+; 1-1000 mg / kg of Ca2+; and 1-1000 mg / kg of Al3+.

Description

Technical Field

[0001] The present invention relates to S ...

Background Art

[0002] In elemental analysis of solids in inductively coupled plasma (ICP) mass spectrometry, secondary ion mass spectrometry (SIMS), and X-ray fluorescence analysis (XRF), solid standard samples that enable analysis of trace elements are required.

Summary of the Invention

Means for Solving the Problems

[0003] The first aspect of the present invention is, in mass%, TeO2 content: 50% or more and 80% or less, Bi2O3 content: 0% or more and 30% or less, WO3 content: 0% or more and 30% or less, ZnO content: 0% or more and 30% or less, BaO content: 0% or more and 30% or less, GeO2 content: 0% or more and 30% or less, Ga2O3 content: 0% or more and 30% or less, including two or more of Bi2O3, WO3, ZnO, BaO, GeO2, Ga2O3, Si 4+ : 1 mg / kg or more and 1000 mg / kg or less, B 3+ : 1 mg / kg or more and 1000 mg / kg or less, P 5+ : 1 mg / kg or more and 1000 mg / kg or less, Li + : 1 mg / kg or more and 1000 mg / kg or less, Na + : 1 mg / kg or more and 1000 mg / kg or less, K + : 1 mg / kg or more and 1000 mg / kg or less, Mg 2+ : 1 mg / kg or more and 1000 mg / kg or less, Ca 2+ : 1 mg / kg or more and 1000 mg / kg or less, and Al 3+It is a glass containing multiple elements in the range of 1 mg / kg to 1000 mg / kg, with a melting temperature of 900°C or lower. Furthermore, in mass%, the content is as follows: TeO2 content: 50% to 80%, Bi2O3 content: 0% to 30%, WO3 content: 0% to 30%, ZnO content: 0% to 30%, BaO content: 0% to 30%, GeO2 content: 0% to 30%, Ga2O3 content: 0% to 30%, and Si 4+ :1mg / kg or more and 1000mg / kg or less, B 3+ :1mg / kg or more and 1000mg / kg or less, K + :1mg / kg or more and 1000mg / kg or less, Mg 2+ : 1 mg / kg or more and 1000 mg / kg or less, and Ca 2+ A glass containing at least one of the following: 1 mg / kg to 1000 mg / kg, with a melting temperature of 900°C or lower. Also, a glass used as a standard sample for elemental analysis, with a TeO2 content of 50% to 80% by mass, and below: Si 4+ :1mg / kg or more and 1000mg / kg or less, B 3+ :1mg / kg or more and 1000mg / kg or less, P 5+ :1mg / kg or more and 1000mg / kg or less, Li + :1mg / kg or more and 1000mg / kg or less, Na + :1mg / kg or more and 1000mg / kg or less, K + :1mg / kg or more and 1000mg / kg or less, Mg 2+ :1mg / kg or more and 1000mg / kg or less, Ca 2+ : 1 mg / kg or more and 1000 mg / kg or less, and Al 3+ The glass contains at least one of the following: 1 mg / kg or more and 1000 mg / kg or less.

[0004] A second aspect of the present invention is, i) A step of washing the crucible and melting equipment by immersing them in an acidic solution for 1 to 24 hours; ii) A step of rinsing the crucible and melting equipment with purified water; iii) A step of drying the crucible and melting equipment; iv) The main components and Si 4+ : 1-1000 mg / kg, B 3+ : 1-1000 mg / kg, P 5+ : 1-1000 mg / kg, Li + : 1-1000 mg / kg, Na + : 1-1000 mg / kg, K + : 1-1000 mg / kg, Mg 2+ : 1-1000 mg / kg, Ca 2+ : 1-1000 mg / kg, and / or Al 3+ The process includes: a) mixing the target element in an amount of 1 to 1000 mg / kg in the crucible, melting it at a temperature of 800 to 900°C for 30 minutes to 8 hours while stirring with the apparatus to obtain a mixture, and a) pouring the mixture into a mold and slowly cooling it. This is a method for producing a glass composition. [Modes for carrying out the invention]

[0005] The following describes embodiments of the present invention (hereinafter referred to as "these embodiments"). These embodiments are illustrative examples for explaining the present invention and are not intended to limit the present invention to the following content.

[0006] The glass composition according to this embodiment has the following main components in mass%, with TeO2 content: 50-80%, Bi2O3 content: 0-30%, WO3 content: 0-30%, ZnO content: 0-30%, BaO content: 0-30%, GeO2 content: 0-30%, Ga2O3 content: 0-30%, and the following additive elements, Si 4+ : 1-1000 mg / kg, B 3+ : 1-1000 mg / kg, P 5+ : 1-1000 mg / kg, Li + : 1-1000 mg / kg, Na + : 1-1000 mg / kg, K + : 1-1000 mg / kg, Mg 2+ : 1-1000 mg / kg, Ca 2+ : 1-1000 mg / kg, and Al 3+ The glass composition contains at least one of the following: 1 to 1000 mg / kg.

[0007] Furthermore, the glass composition according to this embodiment contains the following additive elements as its main components: Si 4+ : 1-1000 mg / kg, B 3+ : 1-1000 mg / kg, P 5+ : 1-1000 mg / kg, Li + : 1-1000 mg / kg, Na + : 1-1000 mg / kg, K +: 1-1000 mg / kg, Mg 2+ : 1-1000 mg / kg, Ca 2+ : 1-1000 mg / kg, and Al 3+ The glass composition contains at least one of the following: 1 to 1000 mg / kg.

[0008] In this specification, unless otherwise specified, the content of each major component shall be expressed as mass % of the total weight of the glass in terms of oxide composition. The oxide-equivalent composition referred to here is the composition in which each component contained in the glass is expressed, assuming that the oxides, complex salts, etc. used as raw materials for the glass components all decompose into oxides during melting, and the total mass of said oxides is set to 100%. Furthermore, unless otherwise specified, the content of the added elements shall be expressed in "mg / kg" as the content in the cation state. "mg / kg" is synonymous with mass ppm.

[0009] The expression "0 to N%" for the Q content includes cases where the Q component is not present, and cases where the Q component is greater than 0% but less than or equal to N%.

[0010] Furthermore, the expression "devitrification resistance stability" refers to the glass's resistance to devitrification. Here, "devitrification" refers to the phenomenon in which the transparency of glass is lost due to crystallization or phase separation that occurs when the glass is heated above its glass transition temperature or when it is cooled from a molten state to below its liquidus temperature.

[0011] The glass composition according to this embodiment has a low melting temperature and high devitrification resistance stability. Conventional glass compositions contain trace amounts of unintended elements as "impurities." The glass composition according to this embodiment is a glass composition that contains trace amounts of intended elements while suppressing the inclusion of unintended elements. Therefore, it can be used as a solid standard sample for mass spectrometry such as inductively coupled plasma (ICP) mass spectrometry, secondary ion mass spectrometry (SIMS), and X-ray fluorescence analysis (XRF).

[0012] The component composition of the glass composition according to this embodiment is described below.

[0013] In this specification, the main constituent components refer to various oxides commonly used in glass compositions, such as TeO2, Bi2O3, WO3, ZnO, BaO, GeO2, and Ga2O3, and represent the components that constitute a glass composition in which the additive elements according to the present invention have not been introduced.

[0014] TeO2 is an essential component in this invention, as it lowers the melting temperature of the glass and improves its devitrification resistance stability. However, if the TeO2 content is too high, the devitrification resistance stability decreases. From this viewpoint, the TeO2 content is 50% to 80%. The lower limit of this content is preferably 55%, more preferably 60%. The upper limit of this content is preferably 75%, more preferably 70%.

[0015] Bi2O3 is a component that can lower the melting temperature of glass and improve the devitrification resistance stability of glass by coexisting with TeO2. However, if the Bi2O3 content is too high, the TeO2 content will relatively decrease, and the devitrification resistance stability will actually worsen. From this viewpoint, the Bi2O3 content is between 0% and 30%. The lower limit of this content is preferably 5%, more preferably 10%. The upper limit of this content is 25%, more preferably 20%.

[0016] WO3 is a component that can lower the melting temperature of glass and improve the devitrification resistance stability of glass by coexisting with TeO2. However, if the WO3 content is too high, the TeO2 content will relatively decrease, and the devitrification resistance stability will actually worsen. From this viewpoint, the WO3 content should be between 0% and 30%. The lower limit of this content is preferably 5%, more preferably 10%. The upper limit of this content is 25%, more preferably 20%.

[0017] ZnO is a component that improves the devitrification resistance stability of glass and can enhance this stability when combined with TeO2. However, excessive ZnO addition can raise the melting temperature of the glass. From this perspective, the ZnO content is between 0% and 30%. The lower limit of this content is preferably 7%, more preferably 15%. The upper limit of this content is preferably 26%, more preferably 22%.

[0018] BaO is a component that improves the devitrification resistance stability of glass and can enhance this stability when combined with TeO2. However, introducing it in excess will raise the melting temperature of the glass. From this perspective, the BaO content is between 0% and 30%. The lower limit of this content is preferably 7%, more preferably 15%. The upper limit of this content is preferably 26%, more preferably 22%.

[0019] GeO2 is a component that improves the devitrification resistance stability of glass, but if it is too high, the melting temperature of the glass will rise. GeO2 is also an expensive raw material. From this viewpoint, the GeO2 content is between 0% and 30%. The lower limit of this content is preferably 5%, more preferably 10%. The upper limit of this content is preferably 25%, more preferably 20%.

[0020] Ga2O3 teeth, While Ga2O3 is a component that improves the devitrification resistance stability of glass, too much of it will raise the melting temperature of the glass. Furthermore, Ga2O3 is an expensive raw material. From this perspective, the Ga2O3 content is between 0% and 30%. The lower limit of this content is preferably 5%, more preferably 10%. The upper limit of this content is preferably 25%, more preferably 20%.

[0021] TeO2 alone cannot form a stable glass, but by coexisting with a certain amount of Bi2O3, WO3, ZnO, BaO, GeO2, Ga2O3, etc., a stable glass with high devitrification resistance can be obtained. Therefore, the total content of Bi2O3, WO3, ZnO, BaO, GeO2, and Ga2O3 (Bi2O3 + WO3 + ZnO + BaO + GeO2 + Ga2O3) is 15% or more and 50% or less. The lower limit of this total content is preferably 25%, more preferably 30%. The upper limit of this total content is preferably 40%, more preferably 35%.

[0022] The content of the first oxide, which is the main component, is 50% or more and 80% or less. The lower limit of this content is preferably 55%, more preferably 60%. The upper limit of this content is preferably 75%, more preferably 70%. In addition, cations (Si) can be added as elements to be added. 4+ B 3+ , P 5+ Li + kaNa + , K + Mg 2+ Ca 2+ and / or Al 3+ It is preferable that the material does not contain oxides containing ) such as SiO2, B2O3, P2O5, etc. Furthermore, it is even more preferable that the first oxide is TeO2.

[0023] The content of the second oxide, which is the main component, is 0% to 30%. The lower limit of this content is preferably 5%, more preferably 10%. The upper limit of this content is preferably 25%, more preferably 20%. The second oxide is at least one of Bi2O3, WO3, ZnO, BaO, GeO2, and Ga2O3. If there are two or more oxides that constitute the second oxide, the content of each oxide is also 0% to 30%, similar to the case where there is only one second oxide.

[0024] Furthermore, if the second oxide is one or more of Bi2O3, WO3, ZnO, BaO, GeO2, or Ga2O3, it is preferable that the total content of Bi2O3, WO3, ZnO, BaO, GeO2, and Ga2O3 (Bi2O3 + WO3 + ZnO + BaO + GeO2 + Ga2O3) is 15 to 50%.

[0025] The content of the third oxide, which is the main component, is 0% or more and 1% or less. The upper limit of this content is preferably 0.5%. The third oxide is preferably at least one of BeO, PbO, As2O3, Tl2O, CdO, UO2, and Th2O3. If there are two or more oxides that make up the third oxide, the content of each oxide is also 0% or more and 1% or less, similar to the case where there is only one third oxide.

[0026] Furthermore, if the third oxide is one or more of BeO, PbO, As2O3, Tl2O, CdO, UO2, and Th2O3, it is even more preferable that the total content of BeO, PbO, As2O3, Tl2O, CdO, UO2, and Th2O3 (BeO + PbO + As2O3 + Tl2O + CdO + UO2 + Th2O3) is 1% or less.

[0027] The glass composition according to this embodiment may be modified as an additive element, such as for elemental analysis, by adding Si. 4+ B 3+ , P 5+ Li + kaNa + , K + Mg 2+ Ca 2+ and / or Al 3+ Each of these cations is introduced in a mass of 1 to 1000 mg / kg (= ppm).

[0028] BeO, PbO, As2O3, Tl2O, CdO, UO2, and Th2O3 are components that have adverse effects on the human body and the environment. Therefore, it is preferable that the content of each component, BeO, PbO, As2O3, Tl2O, CdO, UO2, and Th2O3, be 1% or less. Furthermore, it is preferable that the total content of BeO, PbO, As2O3, Tl2O, CdO, UO2, and Th2O3 (BeO + PbO + As2O3 + Tl2O + CdO + UO2 + Th2O3) be 1% or less.

[0029] In addition to the components described above, other optional components may be added in this embodiment, as long as they do not hinder the achievement of the target glass composition.

[0030] The method for manufacturing the glass composition according to this embodiment will be described below.

[0031] The method for manufacturing the glass composition according to this embodiment is: i) A step of cleaning the crucible and the equipment used for melting by immersing them in an acidic solution for 1 to 24 hours, ii) A step of rinsing the crucible and the equipment used in the melting process with purified water, iii) A step of drying the crucible and the equipment used in the melting process, iv) Main components and, Si 4+ : 1-1000 mg / kg B 3+ : 1-1000 mg / kg P 5+ : 1-1000 mg / kg Li + : 1-1000 mg / kg Na + : 1-1000 mg / kg K + : 1-1000 mg / kg Mg 2+ : 1-1000 mg / kg Ca 2+ : 1-1000 mg / kg, and / or Al 3+The process involves mixing the target element at a concentration of 1 to 1000 mg / kg in the crucible, melting it at a temperature of 800 to 900°C while stirring with the apparatus for 30 minutes to 8 hours, and homogenizing it to obtain a mixture. v) The step of pouring the mixture into a mold and slowly cooling it.

[0032] Process i)~iii) To prevent contamination with impurities, it is preferable to immerse all melting equipment, such as crucibles, lids, and stirring blades, in an acidic solution beforehand for about 1 to 24 hours, and more preferably for about 5 to 16 hours. The acidic solution is preferably one containing at least one of hydrofluoric acid, hydrochloric acid, nitric acid, or sulfuric acid, and more preferably a hydrofluoric acid solution with a concentration of 30 to 50%. After immersion, the melting equipment, such as crucibles, lids, and stirring blades, are washed, rinsed with purified water, and then dried.

[0033] The equipment used in the melting process, such as crucibles, lids, and stirring blades, contains at least one of the following metals: platinum, gold, or iridium, due to its low reactivity with the molten glass, which suppresses erosion of the crucible by the molten glass, and its high resistance to acid.

[0034] Process iv) The main components, such as oxides, hydroxides, carbonates, and nitrates, are weighed out to achieve the component composition (mass%) of the glass composition according to the present embodiment described above.

[0035] After weighing and mixing the main components and placing them in a crucible, a fixed amount of the target element is added according to the purpose. The target element can be introduced by directly adding raw materials such as oxides, hydroxides, carbonates, or nitrates, or by dropwise adding a fixed amount of nitrate aqueous solution containing the target element. When using the dropwise addition method, the solution is not limited to nitrate aqueous solution; any solution in which the target element is stably dissolved is acceptable.

[0036] The element to be added is Si 4+ B 3+ , P 5+ Li + kaNa + , K + Mg2+ 、 Ca 2+ 、 and Al 3+ One or more cations selected from the group consisting of, each added in a mass of 1 to 1000 mg / kg.

[0037] Cover the crucible with a lid and melt at a temperature of 800 to 900 °C, preferably 800 to 850 °C, for 30 minutes to 8 hours, preferably 1 to 5 hours, and stir to homogenize.

[0038] Step v) After cooling to an appropriate temperature, pour into a mold or the like and gradually cool to obtain each glass sample. As a determination of vitrification, visually confirm that crystallization has not occurred.

[0039] The following describes the suitable properties of the glass composition in this embodiment.

[0040] The melting temperature of the glass composition according to this embodiment is 900 °C or lower from the viewpoint of preventing the volatilization of the target element to be added during melting and the fluctuation of the concentration level. The upper limit of the melting temperature is preferably 850 °C, more preferably 800 °C.

[0041] The glass composition according to this embodiment has devitrification resistance stability and contains a trace amount of the intended element while suppressing the inclusion of unintended elements.

[0042] The glass composition according to this embodiment having the above-described properties can be used, for example, as a solid standard sample in elemental analysis. In particular, it can be suitably used as a solid standard sample enabling the analysis of 4+ Si 3+ B 5+ P + Li + Na + K 2+ Mg 2+ Ca 3+ or Al.

Example

[0043] Next, examples and comparative examples of the present invention will be described. The present invention is not limited to these examples.

[0044] <Preparation of glass compositions> The glass compositions for each example and each comparative example were prepared using the following procedure.

[0045] First, glass raw materials such as oxides, hydroxides, carbonates, and nitrates were weighed to a total weight of 100g, so that they matched the chemical composition (mass%) shown in Tables 1 to 7.

[0046] For the introduction of the target element, a method was used in which the raw material containing the target element was directly added for high-concentration additions (200 ppm or more), and a method was used in which a fixed amount of nitrate aqueous solution containing the target element was added dropwise for low-concentration additions (less than 200 ppm).

[0047] Next, the weighed glass raw materials were mixed and placed in a platinum crucible, where they were melted at a temperature of 800-1100°C for 1-2 hours and then stirred to homogenize them.

[0048] To prevent contamination with impurities, the platinum crucible, platinum lid, and platinum stirring blade used for stirring were all pre-cleaned by immersing them in a 30-50% hydrofluoric acid solution for 5-16 hours, then rinsed with purified water and dried. After that, the mixture was cooled to an appropriate temperature, cast into a mold, and slowly cooled to obtain each glass sample. To determine vitrification, it was confirmed by visual inspection that no crystallization had occurred.

[0049] <Quantitative analysis of glass composition> Each prepared glass sample was first washed on its surface with dilute acid, then pulverized. The pulverized glass sample was dissolved in an acidic solution, and the resulting solution, diluted to a fixed volume with pure water, was used as the test solution.

[0050] The above test solutions were subjected to quantitative analysis of the added elements using an ICP emission spectrometer (Shimadzu ICPS8100) or an ICP mass spectrometer (Agilent 7700x). During this process, a calibration curve was created using liquid standard samples with known concentrations of the target elements, and the amount of the target element in the analyte glass was determined.

[0051] Tables 1-7 show the component composition (by mass), melting temperature, and presence or absence of devitrification for each example and comparative example.

[0052] [Table 1]

[0053] [Table 2]

[0054] [Table 3]

[0055] [Table 4]

[0056] [Table 5]

[0057] [Table 6]

[0058] [Table 7]

[0059] From the above, it was confirmed that the glass compositions of each example had low melting temperatures and did not devitrify. On the other hand, for Comparative Examples 2, 3, and 6, the melting temperatures were 900°C or higher, and devitrification was confirmed in all of the comparative examples.

[0060] Furthermore, the ICP quantitative values ​​of the glass compositions in each example confirmed that the target elements were introduced into the glass compositions in the desired amounts.

Claims

1. In mass percent, TeO ２ Content rate: 50% to 80% Bi ２ O ３ Content rate: 0% to 30% WO ３ Content rate: 0% to 30% ZnO content: 0% or more and 30% or less, BaO content: 0% or more and 30% or less, GeO ２ Content rate: 0% to 30% Ga ２ O ３ Content: 0% or more and 30% or less. Bi ２ O ３ , WO ３ , ZnO, BaO, GeO ２ , Ga ２ O ３ containing two or more of them, Si ４＋ : 1 mg / kg or more, 1000 mg / kg or less B ３＋ : 1 mg / kg or more, 1000 mg / kg or less P ５＋ : 1 mg / kg or more, 1000 mg / kg or less Li ＋ : 1 mg / kg or more, 1000 mg / kg or less Na ＋ : 1 mg / kg or more, 1000 mg / kg or less K ＋ : 1 mg / kg or more, 1000 mg / kg or less Mg ２＋ : 1 mg / kg or more, 1000 mg / kg or less Ca ２＋ : 1 mg / kg or more and 1000 mg / kg or less, Al ３＋ : Contains multiple amounts ranging from 1 mg / kg to 1000 mg / kg, Glass with a melting point of 900°C or lower.

2. In mass percent, TeO ２ Content rate: 50% to 80% Bi ２ O ３ Content rate: 0% to 30% WO ３ Content rate: 0% to 30% ZnO content: 0% or more and 30% or less, BaO content: 0% or more and 30% or less, GeO ２ Content rate: 0% to 30% Ga ２ O ３ Content: 0% or more and 30% or less. Si ４＋ : 1 mg / kg or more, 1000 mg / kg or less B ３＋ : 1 mg / kg or more, 1000 mg / kg or less K ＋ : 1 mg / kg or more, 1000 mg / kg or less Mg ２＋ : 1 mg / kg or more and 1000 mg / kg or less, Ca ２＋ : Contains at least one of the following: 1 mg / kg or more and 1000 mg / kg or less. Glass with a melting point of 900°C or lower.

3. In mass percent, Bi ２ O ３ WO ３ , ZnO, BaO, GeO ２ Ga ２ O ３ Total content (Bi ２ O ３ +WO ３ +ZnO+BaO+GeO ２ +Ga ２ O ３ The glass according to claim 1 or 2, wherein the content of ) is 15% or more and 50% or less.

4. In mass percent, BeO content: 0% or more and 1% or less, PbO content: 0% or more and 1% or less, As ２ O ３ Content rate: 0% to 1% Tl ２ O content: 0% to 1% CdO content: 0% or more and 1% or less, UO ２ Content rate: 0% to 1% Th ２ O ３ Glass according to any one of claims 1 to 3, wherein the content is 0% or more and 1% or less.

5. In mass percent, BeO, PbO, As ２ O ３ , Tl ２ O, CdO, UO ２ , Th ２ O ３ Total content (BeO + PbO + As ２ O ３ +Tl ２ O + CdO + UO ２ +Th ２ O ３ The glass according to claim 4, wherein the content of ) is 1% or less.

6. The glass is a standard sample for elemental analysis, as described in any one of claims 1 to 5.

7. Glass used as a standard sample for elemental analysis, In mass percent, TeO ２ The content is between 50% and 80%. below, Si ４＋ : 1 mg / kg or more, 1000 mg / kg or less B ３＋ : 1 mg / kg or more, 1000 mg / kg or less P ５＋ : 1 mg / kg or more, 1000 mg / kg or less Li ＋ : 1 mg / kg or more, 1000 mg / kg or less Na ＋ : 1 mg / kg or more, 1000 mg / kg or less K ＋ : 1 mg / kg or more, 1000 mg / kg or less Mg ２＋ : 1 mg / kg or more, 1000 mg / kg or less Ca ２＋ : 1 mg / kg or more and 1000 mg / kg or less, Al ３＋ At least one of the following is introduced: 1 mg / kg or more and 1000 mg / kg or less. Glass with a melting point of 900°C or lower.

8. In mass percent, The glass according to claim 7, wherein the content of the second oxide is 0% or more and 30% or less.

9. The second oxide is Bi ２ O ３ WO ３ , ZnO, BaO, GeO ２ Ga ２ O ３ The glass according to claim 8, comprising at least one of the following.

10. In mass percent, Bi ２ O ３ , WO ３ , ZnO, BaO, GeO ２ , Ga<\(0000085\)>O ３ The total content of (Bi ２ O ３ + WO ３ + ZnO + BaO + GeO ２ + Ga ２ O ３ ) is 15% or more and 50% or less. The glass according to claim 9. Note: The <\(0000085\)> in the English translation is to show that the original ２ is preserved as required. In a proper translation context, it should be in the correct format without the parentheses around the numbers in the tag.

11. In mass percent, The glass according to any one of claims 7 to 10, wherein the content of the third oxide is 0% or more and 1% or less.

12. The third oxide is at least one of BeO, PbO, As ２ O ３ , Tl ２ O, CdO, UO ２ , Th ２ O ３ The glass according to claim 11, comprising at least one of these.

13. In mass percent, BeO, PbO, As ２ O ３ , Tl ２ O, CdO, UO ２ , Th ２ O ３ Total content (BeO + PbO + As ２ O ３ +Tl ２ O + CdO + UO ２ +Th ２ O ３ The glass according to claim 12, wherein the percentage of ) is 1% or less.

14. The glass according to any one of claims 6 to 13, wherein the standard sample for elemental analysis is a standard sample for inductively coupled plasma (ICP) mass spectrometry, secondary ion mass spectrometry (SIMS), and / or X-ray fluorescence analysis (XRF).

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