Glass and optical element
Provided is oxide glass in which a content of P 5+ is 7 to 43 cation %, a content of Nb ions is 10 to 21 cation %, a content of Li + is 20 cation % or more, a total content of Nb ions and Li + is 48 to 70 cation %, a content of Bi ions is more than 0 cation % and is equal to or less than 6 cation %, a content of Ba 2+ is 5 cation % or less, a content of Zr 4+ is 2 cation % or less, a total content of Ti ions and W ions is 5 cation % or less, and a cation ratio of the content of Li + to a total content of Li + , Na + , and K + [Li + /(Li + +Na + +K + )] is 0.5 or more.
1. An oxide glass, wherein:
a content of P 5+ is 7 to 43 cation %,
a content of Nb ions is 10 to 21 cation %,
a content of Li + is 30 cation % or more,
a total content of Nb ions and Li + is 48 to 70 cation %,
a content of Bi ions is more than 0 cation % and is equal to or less than 6 cation %,
a content of Ba 2+ is 5 cation % or less,
a content of Zr 4+ is 2 cation % or less,
a total content of Ti ions and W ions is 5 cation % or less, and
a cation ratio of the content of Li + to a total content of Li + , Na + , and K + [Li + /(Li + +Na + +K + )] is 0.7 or more.
2. The oxide glass according to claim 1 , wherein the content of Li + is 40 cation % or more.
3. The oxide glass according to claim 1 , wherein:
the content of P 5+ is 27 to 43 cation %,
the content of Li + is 35 cation % or more,
the total content of Ti ions and W ions is 4 cation % or less, and
a cation ratio of the total content of Ti ions, Nb ions, W ions, and Bi ions to the total content of P 5+ , B 3+ , and Si 4+ [(Ti+Nb+W+Bi)/(P 5+ +B 3+ +Si 4+ )] is 0.7 or less.
4. The oxide glass according to claim 1 , wherein;
the content of P 5+ is 27 to 43 cation %,
the content of Li + is 40 cation % or more,
the total content of Ti ions and W ions is 4 cation % or less, and
a cation ratio of the total content of Ti ions, Nb ions, W ions, and Bi ions to the total content of P 5+ , B 3+ , and Si 4+ [(Ti+Nb+W+Bi)/(P 5+ +B 3+ +Si 4+ )] is 0.7 or less.
5. The oxide glass according to claim 1 , wherein the oxide glass has a specific gravity of 3.5 or less.
6. An optical element comprising the oxide glass according to claim 1 .
7. The optical element according to claim 6 , wherein the optical element is a cover glass.
8. The optical element according to claim 6 integrally comprising:
a light-transmitting portion; and
a light-shielding portion in which a transmittance of visible light is smaller in comparison to the light-transmitting portion,
wherein a total content of Nb ions and Li + is 50 cation % or more in the oxide glass.
9. The optical element according to claim 8 , wherein the oxide glass has a specific gravity of 3.5 or less.
10. The optical element according to claim 8 , wherein the optical element is a cover glass.
11. The optical element according to claim 6 , wherein:
the oxide glass has a specific gravity of 3.5 or less,
the optical element integrally includes a light-transmitting portion in which an internal transmittance at a wavelength of 380 nm in terms of a thickness of 1.0 mm is 96% or more, and a light-shielding portion in which an optical density OD at a wavelength of 1100 nm is 0.5 or more, and
the light-transmitting portion and the light-shielding portion have the same glass composition.
12. The optical element according to claim 11 , wherein the light-shielding portion and the light-transmitting portion have substantially the same refractive index.
13. The optical element according to claim 11 , wherein the optical element is a cover glass.