Glass composition and method for producing glass composition

Abstract

This glass composition contains, as main components: 50-80 mass% of TeO2; 0-30 mass% of Bi2O3; 0-30 mass% of WO3; 0-30 mass% of ZnO; 0-30 mass% of BaO; 0-30 mass% of GeO2; and 0-30 mass% of Ga2O3, wherein at least one among the following to-be-added elements, such as 1-1,500 mg / kg of Si4+, 1-1,500 mg / kg of B3+, 1-1,500 mg / kg of P5+, 1-1,500 mg / kg of Li+, 1-1,500 mg / kg of Na+, 1-1,500 mg / kg of K+, 1-1,500 mg / kg of Mg2+, 1-1,500 mg / kg of Ca2+, 1-1,500 mg / kg of Al3+, and 1-1,500 mg / kg of Sr2+, are introduced into the glass composition.

Description

[Technical Field]

[0001] The present invention relates to a glass composition and a method for manufacturing the glass composition. This invention claims priority from International Application No. PCT / JP2021 / 011319, filed on March 19, 2021, and the contents of that application are incorporated herein by reference in designated states where incorporation by reference is permitted. [Background technology]

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

[0003] A first aspect of the present invention is a glass used for a standard sample for elemental analysis, which has, in mass %, a TeO2 content of 50% to 80%, a Bi2O3 content of 0% to 30%, a WO3 content of 0% to 30%, a ZnO content of 0% to 30%, a BaO content of 0% to 30%, a GeO2 content of 0% to 30%, and a Ga2O3 content of 0% to 30%. 、S i 4+ :1mg / kg or more and 1500mg / kg or less, B 3+ :1mg / kg or more and 1500mg / kg or less, P 5+ :1mg / kg or more and 1500mg / kg or less, Li + :1mg / kg or more and 1500mg / kg or less, Na + :1mg / kg or more and 1500mg / kg or less, K + :1mg / kg or more and 1500mg / kg or less, Mg 2+ :1mg / kg or more and 1500mg / kg or less, Ca 2+ :1mg / kg or more and 1500mg / kg or less, Al 3+ : 1mg / kg or more and 1500mg / kg or less, and Sr 2+The glass is a glass containing at least one of Te, Bi, W, Zn, Ba, Ge, and Ga, and at least one of Te, Bi, W, Zn, Ba, Ge, and Ga, in a mass percent range. The glass is a glass containing at least one of TeO2, Bi, W, Zn, Ba, Ge, and Ga, in a mass percent range. The glass is a glass containing at least one of Te ... 4+ :1mg / kg or more and 1500mg / kg or less, B 3+ :1mg / kg or more and 1500mg / kg or less, P 5+ :1mg / kg or more and 1500mg / kg or less, Li + :1mg / kg or more and 1500mg / kg or less, Na + :1mg / kg or more and 1500mg / kg or less, K + :1mg / kg or more and 1500mg / kg or less, Mg 2+ :1mg / kg or more and 1500mg / kg or less, Ca 2+ :1mg / kg or more and 1500mg / kg or less, Al 3+ : 1mg / kg or more and 1500mg / kg or less, and Sr 2+ : At least one of 1 mg / kg or more and 1500 mg / kg or less is introduced, In be 。

[0004] The second aspect of the present invention is , Ga A method for producing a glass composition i) immersing the crucible and the tools used in the melting process in an acidic solution for 1 to 24 hours to clean them; ii) rinsing the crucible and the tools used in the melting process with purified water; iii) drying the crucible and the tools used in the melting process; and iv) determining the main components and Si 4+ : 1 to 1500 mg / kg, B 3+ : 1 to 1500 mg / kg, P 5+ : 1 to 1500 mg / kg, Li + : 1 to 1500 mg / kg, Na + : 1 to 1500 mg / kg, K + : 1 to 1500 mg / kg, Mg 2+ : 1 to 1500 mg / kg, Ca 2+ : 1 to 1500 mg / kg, Al 3+ : 1 to 1500 mg / kg, and / or Sr 2+ 1 to 1500 mg / kg of the target element to be added is mixed in the crucible, and melted at a temperature of 800 to 900°C for 30 minutes to 8 hours while stirring with the tool to obtain a mixture; and v) the mixture is poured into a mold and slowly cooled. . DETAILED DESCRIPTION OF THE INVENTION

[0005] Hereinafter, an embodiment of the present invention (hereinafter referred to as "the present embodiment") will be described. The present embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content.

[0006] The glass composition according to this embodiment contains, in mass %, the main components: 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%, and Ga2O3 content: 0 to 30%. The glass composition also contains the following additional elements: Si 4+ : 1 to 1500 mg / kg, B 3+ : 1 to 1500 mg / kg, P 5+ : 1 to 1500 mg / kg, Li + : 1 to 1500 mg / kg, Na + : 1 to 1500 mg / kg, K + : 1 to 1500 mg / kg, Mg 2+ : 1 to 1500 mg / kg, Ca 2+ : 1 to 1500 mg / kg, Al 3+ : 1 to 1500 mg / kg, and Sr 2+ : A glass composition containing at least one of 1 to 1500 mg / kg of ZnO.

[0007] Furthermore, the glass composition according to this embodiment is a glass composition in which the main components contained in the glass composition are, in mass %, 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%, and Ga2O3 content: 0 to 30%, and the glass composition contains target elements to be added that are elements different from Te, Bi, W, Zn, Ba, Ge, and Ga, and the glass composition contains the target elements to be added in an amount of 1 to 1500 mg / kg per element.

[0008] The glass composition according to this embodiment further contains the following additional elements in addition to the main components: Si 4+ : 1 to 1500 mg / kg, B 3+ : 1 to 1500 mg / kg, P 5+ : 1 to 1500 mg / kg, Li + : 1 to 1500 mg / kg, Na + : 1 to 1500 mg / kg, K + : 1 to 1500 mg / kg, Mg 2+ : 1 to 1500 mg / kg, Ca 2+ : 1 to 1500 mg / kg, Al 3+ : 1 to 1500 mg / kg, and Sr 2+ : A glass composition containing at least one of 1 to 1500 mg / kg of ZnO.

[0009] Unless otherwise specified, the content of each major component in this specification is expressed as mass % of the total weight of the glass in terms of oxide. The oxide-equivalent composition here refers to the composition of each component contained in the glass, assuming that the oxides, complex salts, etc. used as raw materials for the glass components are all decomposed and converted to oxides during melting, with the total mass of the oxides being 100%. Furthermore, unless otherwise specified, the content of the target element is expressed as the content in the cationic state in "mg / kg." "mg / kg" is synonymous with ppm by mass.

[0010] The expression "0 to N%" of the Q content includes cases where the Q component is not included and cases where the Q component is more than 0% and not more than N%.

[0011] The expression "devitrification resistance" refers to the resistance of glass to devitrification. Here, "devitrification" refers to a phenomenon in which glass loses transparency due to crystallization or phase separation that occurs when the temperature of glass is raised to or above its glass transition temperature or when the temperature is lowered from a molten state to or below its liquidus temperature.

[0012] The glass composition according to this embodiment has a low melting temperature and high resistance to devitrification. Conventionally produced 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 minimizing 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 spectrometry (XRF).

[0013] The component composition of the glass composition according to this embodiment will be described below.

[0014] In this specification, the term "major components" refers to various oxides that are generally used in glass compositions, such as TeO2, Bi2O3, WO3, ZnO, BaO, GeO2, and Ga2O3, and refers to components that constitute the glass composition in a state in which the target additive element according to the present invention has not been incorporated.

[0015] TeO2 is a component that lowers the melting temperature of glass and improves devitrification resistance, and is an essential component in the present invention. However, if the content is too high, the devitrification resistance decreases. From this perspective, the TeO2 content 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%.

[0016] Bi2O3 is a component that lowers the melting temperature of glass and, when coexisting with TeO2, can improve the devitrification resistance of glass. However, if the content is too high, the TeO2 content decreases relatively, and the devitrification resistance deteriorates. From this perspective, the Bi2O3 content is 0% or more and 30% or less. The lower limit of this content is preferably 5%, more preferably 10%. The upper limit of this content is 25%, more preferably 20%.

[0017] WO3 is a component that lowers the melting temperature of glass and, when coexisting with TeO2, can improve the devitrification resistance of glass. However, if this content is too high, the TeO2 content decreases relatively, and devitrification resistance deteriorates. From this perspective, the WO3 content is 0% or more and 30% or less. The lower limit of this content is preferably 5%, more preferably 10%. The upper limit of this content is 25%, more preferably 20%.

[0018] ZnO is a component that improves the devitrification resistance of glass, and when coexisting with TeO2, it can enhance the devitrification resistance of glass. However, if incorporated in excess, the melting temperature of the glass increases. From this perspective, the ZnO content is 0% or more and 30% or less. 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] BaO is a component that improves the devitrification resistance of glass, and when coexisting with TeO2, can enhance the devitrification resistance of glass. However, if incorporated in excess, the melting temperature of the glass increases. From this perspective, the BaO content is 0% or more and 30% or less. The lower limit of this content is preferably 7%, more preferably 15%. The upper limit of this content is preferably 26%, more preferably 22%.

[0020] GeO2 is a component that improves the devitrification resistance of glass, but if it is present in too much amount, the melting temperature of the glass will increase. GeO2 is also an expensive raw material. From this perspective, the GeO2 content is 0% or more and 30% or less. 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] Ga2O3 is a component that improves the devitrification resistance stability of glass, but if it is present in too much amount, the melting temperature of the glass will increase. Ga2O3 is also an expensive raw material. From this perspective, the Ga2O3 content is 0% or more and 30% or less. The lower limit of this content is preferably 5%, more preferably 10%. The upper limit of this content is preferably 25%, more preferably 20%.

[0022] Although TeO2 alone cannot form a stable glass, its coexistence with certain amounts of Bi2O3, WO3, ZnO, BaO, GeO2, Ga2O3, etc. makes it possible to obtain a stable glass with high resistance to devitrification. 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%.

[0023] The content of the first oxide of 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, the cations (Si 4+ , B 3+ , P 5+ , Li + , Na + , K. + , Mg 2+ , Ca 2+ , Al 3+ and / or Sr 2+It is preferable that the first oxide does not contain oxides containing TeO2, such as oxides of SiO2, B2O3, P2O5, etc. It is more preferable that the first oxide is TeO2.

[0024] The content of the second oxide of the main component is 0% or more and 30% or less. 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. When there are two or more oxides that become the second oxide, the content of each oxide is 0% or more and 30% or less, just like when there is only one second oxide.

[0025] Furthermore, when the second oxide is one or more of Bi2O3, WO3, ZnO, BaO, GeO2, and Ga2O3, the total content of Bi2O3, WO3, ZnO, BaO, GeO2, and Ga2O3 (Bi2O3+WO3+ZnO+BaO+GeO2+Ga2O3) is preferably 15 to 50%.

[0026] The content of the third oxide, which is a major 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. When there are two or more oxides that become the third oxide, the content of each oxide is 0% or more and 1% or less, just like when there is only one third oxide.

[0027] Furthermore, when the third oxide is one or more of BeO, PbO, As2O3, Tl2O, CdO, UO2, and Th2O3, it is 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.

[0028] The glass composition according to this embodiment may contain Si as an added element depending on the purpose of elemental analysis, etc.4+ , B 3+ , P 5+ , Li + , Na + , K. + , Mg 2+ , Ca 2+ , Al 3+ and / or Sr 2+ The cations are introduced in a mass of 1 to 1500 mg / kg (= ppm by mass) respectively. As for the cations that can be added as the added elements, 1 to 10 types of added elements can be appropriately selected and added to one glass composition.

[0029] 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 of the components BeO, PbO, As2O3, Tl2O, CdO, UO2, and Th2O3 is 1% or less. It is also 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.

[0030] In addition to the above-mentioned components, other optional components may be added within a range that does not interfere with achieving the intended glass composition in this embodiment.

[0031] A method for producing the glass composition according to this embodiment will be described below.

[0032] The method for producing a glass composition according to this embodiment includes the steps of: i) cleaning the crucible and the equipment used in melting by immersing them in an acidic solution for 1 to 24 hours; ii) rinsing the crucible and the equipment associated with the melting with purified water; iii) drying the crucible and the equipment associated with the melting; iv) major ingredients; Si 4+ :1~1500mg / kg, B 3+ :1~1500mg / kg, P 5+ :1~1500mg / kg, Li + :1~1500mg / kg, Na + :1~1500mg / kg, K + :1~1500mg / kg, Mg 2+ :1~1500mg / kg, Ca 2+ : 1 to 1500 mg / kg Al 3+ : 1 to 1500 mg / kg, and / or Sr 2+ a step of mixing 1 to 1500 mg / kg of an element to be added in the crucible, and melting the mixture at a temperature of 800 to 900°C for 30 minutes to 8 hours while stirring with the device to obtain a mixture; and v) pouring the mixture into a mold and allowing it to cool slowly.

[0033] Process i)~iii) To prevent the inclusion of impurities, all melting equipment, such as the crucible, lid, and stirring blades, is preferably immersed in an acidic solution for 1 to 24 hours, more preferably for 5 to 16 hours. The acidic solution is preferably an acidic solution containing at least one of hydrofluoric acid, hydrochloric acid, nitric acid, and sulfuric acid, more preferably a hydrofluoric acid solution with a concentration of 30 to 50%. The immersed melting equipment, such as the crucible, lid, and stirring blades, is then washed, rinsed with purified water, and dried.

[0034] Equipment used in melting, such as crucibles, lids, and stirring blades, contains at least one metal selected from platinum, gold, and iridium because it has low reactivity with the glass melt, suppresses erosion of the crucible by the melt, and is highly resistant to acid.

[0035] Process iv) The main components, such as oxides, hydroxides, carbonates, and nitrates, are weighed out so as to obtain the component composition (mass %) of the glass composition according to this embodiment described above.

[0036] After the weighed main components are mixed and placed in a crucible, a certain amount of the target element is added depending on the purpose. The target element can be introduced by directly adding raw materials such as oxides, hydroxides, carbonates, and nitrates, or by dripping a certain amount of a nitrate aqueous solution containing the target element. When using the dripping method, the solution is not limited to a nitrate aqueous solution, and any solution in which the target element is stably dissolved can be used.

[0037] The added element is Si 4+ , B 3+ , P 5+ , Li + , Na + , K. + , Mg 2+ , Ca 2+ , Al 3+ , and Sr 2+ The cations are one or more cations selected from the group consisting of, and each is added in an amount of 1 to 1500 mg / kg by mass. As for the cations that can be added as the added elements, one to ten types of added elements can be selected appropriately and added to a single glass composition.

[0038] The crucible is covered with a lid, and the mixture is melted 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 stirred to homogenize.

[0039] Process v) After cooling to an appropriate temperature, the glass is poured into a mold or the like and slowly cooled to obtain a glass sample. Vitrification is judged by visually confirming that no crystallization has occurred.

[0040] Preferred properties of the glass composition of this embodiment will be described below.

[0041] The melting temperature of the glass composition according to this embodiment is 900°C or lower in order to prevent the target elements from volatilizing during melting and causing fluctuations in the concentration levels of the target elements. The upper limit of the melting temperature is preferably 850°C, more preferably 800°C.

[0042] The glass composition according to this embodiment has stability against devitrification, and further contains trace amounts of intended elements while suppressing the inclusion of unintended elements.

[0043] 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, Si 4+ , B 3+ , P 5+ , Li + , Na + , K. + , Mg 2+ , Ca 2+ , Al 3+ , or Sr 2+ It can be suitably used as a solid standard sample that enables the analysis of [Example]

[0044] Next, examples of the present invention and comparative examples will be described, but the present invention is not limited to these examples.

[0045] <Preparation of Glass Composition> The glass compositions according to the examples and comparative examples were prepared in the following manner.

[0046] First, glass raw materials such as oxides, hydroxides, carbonates, and nitrates were weighed out to a total weight of 100 g so as to obtain the chemical compositions (mass %) shown in Tables 1 to 8.

[0047] To introduce the target element, a method of directly adding raw materials containing the target element was used for high concentration additions (200 ppm or more), and a method of dropping a certain amount of nitrate aqueous solution containing the target element was used for low concentration additions (less than 200 ppm).

[0048] Next, the weighed glass raw materials were mixed and placed in a platinum crucible, melted at a temperature of 800 to 1100°C for 1 to 2 hours, and stirred to homogenize. After that, the temperature was lowered to an appropriate level, and the mixture was poured into a mold or the like and slowly cooled to obtain each glass sample. Vitrification was judged by visually confirming that no crystallization had occurred.

[0049] To prevent the inclusion of impurities, the platinum crucible, the platinum lid used during melting, and the platinum stirring blades used for stirring were all immersed in a 30-50% hydrofluoric acid solution for 5-16 hours in advance to clean them, rinsed with purified water, and then dried.

[0050] <Quantitative analysis of glass composition> The surface of each glass sample was first washed with dilute acid and then crushed. The crushed glass sample was dissolved in an acidic solution, and the resulting solution was diluted with pure water to a constant volume to prepare a test solution.

[0051] The test solution was quantitatively analyzed for the added elements using an ICP optical emission spectrometer (Shimadzu ICPS8100) or an ICP mass spectrometer (Agilent 7700x). A calibration curve was prepared for an appropriate concentration range using a liquid standard sample with a known concentration of the added element, and the amount of the added element in the analyzed glass was determined.

[0052] Tables 1 to 8 show the component composition (by mass), melting temperature, and whether or not devitrification occurred for each example and comparative example.

[0053] [Table 1]

[0054] [Table 2]

[0055] [Table 3]

[0056] [Table 4]

[0057] [Table 5]

[0058] [Table 6]

[0059] [Table 7]

[0060] [Table 8]

[0061] From the above, it was confirmed that the glass compositions of each Example had a low melting temperature and were free from devitrification. On the other hand, the melting temperatures of Comparative Examples 2, 3, and 6 were 900°C or higher, and devitrification was confirmed in all Comparative Examples.

[0062] Furthermore, it was confirmed from the ICP quantitative values ​​of the glass compositions of the examples that the intended added elements were introduced into the glass compositions in the intended amounts.

Claims

1. A glass used as a standard sample for elemental analysis, In mass%, 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, 1500 mg / kg or less B ３＋ : 1 mg / kg or more, 1500 mg / kg or less P ５＋ : 1 mg / kg or more, 1500 mg / kg or less Li ＋ : 1 mg / kg or more, 1500 mg / kg or less Na ＋ : 1 mg / kg or more, 1500 mg / kg or less K ＋ : 1 mg / kg or more, 1500 mg / kg or less Mg ２＋ : 1 mg / kg or more, 1500 mg / kg or less Ca ２＋ : 1 mg / kg or more, 1500 mg / kg or less Al ３＋ : 1 mg / kg or more and 1500 mg / kg or less, and Sr ２＋ : Glass into which at least one of 1 mg / kg or more and 1500 mg / kg or less is introduced.

2. A glass used as a standard sample for elemental analysis, In mass%, 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, The glass contains an element other than Te, Bi, W, Zn, Ba, Ge, and Ga in an amount of 1 mg / kg or more and 1500 mg / kg or less per element.

3. 3. The glass of claim 2, further comprising at least one of Si, B, P, Li, Na, K, Mg, Ca, Al, and Sr.

4. In mass%, Bi ２ O ３ , W.O. ３ , ZnO, BaO, GeO ２ , Ga ２ O ３ Total content of Bi ２ O ３ +WO ３ +ZnO+BaO+GeO ２ +Ga ２ O ３ 4. The glass according to claim 1, wherein the ratio of SiO 2 to SiO 2 is 15% or more and 50% or less.

5. It is glass, In mass%, 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 The glass according to any one of claims 1 to 4, wherein the content is 0% or more and 1% or less.

6. In mass%, BeO, PbO, As ２ O ３ , Tl ２ O, CdO, UO ２ , Th ２ O ３ The total content of BeO + PbO + As ２ O ３ +Tl ２ O + CdO + UO ２ +Th ２ O ３ 6. The glass of claim 5, wherein the content of C is 1% or less.

7. A glass used as a standard sample for elemental analysis, In mass%, TeO ２ Content: 50% or more and 80% or less, Si ４＋ : 1 mg / kg or more, 1500 mg / kg or less B ３＋ : 1 mg / kg or more, 1500 mg / kg or less P ５＋ : 1 mg / kg or more, 1500 mg / kg or less Li ＋ : 1 mg / kg or more, 1500 mg / kg or less Na ＋ : 1 mg / kg or more, 1500 mg / kg or less K ＋ : 1 mg / kg or more, 1500 mg / kg or less Mg ２＋ : 1 mg / kg or more, 1500 mg / kg or less Ca ２＋ : 1 mg / kg or more, 1500 mg / kg or less Al ３＋ : 1 mg / kg or more and 1500 mg / kg or less, and Sr ２＋ : Glass into which at least one of 1 mg / kg or more and 1500 mg / kg or less is introduced.

8. In mass%, 8. The glass of 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 , W.O. ３ , ZnO, BaO, GeO ２ , Ga ２ O ３ The glass according to claim 8, comprising at least one of:

10. In mass%, Bi ２ O ３ , W.O. ３ , ZnO, BaO, GeO ２ , Ga ２ O ３ Total content of Bi ２ O ３ +WO ３ +ZnO+BaO+GeO ２ +Ga ２ O ３ 10. The glass of claim 9, wherein the ratio of Cr to Cu is 15% or greater and 50% or less.

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

12. The third oxide is 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:

13. In mass%, BeO, PbO, As ２ O ３ , Tl ２ O, CdO, UO ２ , Th ２ O ３ The total content of BeO + PbO + As ２ O ３ +Tl ２ O + CdO + UO ２ +Th ２ O ３ 13. The glass of claim 12, wherein SiO 2 is 0.1% or less.

14. 14. The glass of claim 1, 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 spectrometry (XRF).

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