Glass composition and member having the same on substrate
View Patent ↗A glass composition having high refractive index, softening property at low temperature and small average thermal expansion coefficient, and a member provided with the composition on a substrate, are provided. The glass composition of the present invention has a refractive index (n d ) of from 1.88 to 2.20, a glass transition temperature (T g ) of from 450 to 490° C., and an average thermal expansion coefficient at temperatures from 50° C. to 300° C. (α 50-300 ) of from 60×10 −7 /K to 90×10 −7 /K, and includes Bi 2 O 3 in an amount of from 5 to 25% in terms of mol % on the basis of oxides.
1. A glass composition having a refractive index (n d ) of from 1.88 to 2.20, a glass transition temperature (T g ) of from 450 to 490° C. and an average thermal expansion coefficient at temperatures from 50° C. to 300° C. (α 50-300 ) of from 60×10 −7 /K to 85×10 −7 /K, and comprising Bi 2 O 3 in an amount of from 5 to 25% in terms of mol % on the basis of oxides.
2. The glass composition according to claim 1 , comprising, in terms of mol % on the basis of oxides:
15 to 30% of P 2 O 5 ,
5 to 27% of Nb 2 O 5 , and
4 to 35% of ZnO.
3. The glass composition according to claim 2 , comprising, in terms of mol % on the basis of oxides:
0 to 17% of B 2 O 3 ,
0 to 14% of Li 2 O,
0 to 7% of Na 2 O,
0 to 7% of K 2 O,
0 to 13% of TiO 2 ,
0 to 20% of WO 3 ,
0 to 7% of TeO 2 ,
0 to 7% of GeO 2 ,
0 to 2% of Sb 2 O 3 , and
0 to 10% of alkaline earth metal oxides,
wherein a total content of alkali metal oxides is 14% or less.
4. The glass composition according to claim 2 , which does not substantially contain Na 2 O and K 2 O.
5. The glass composition according to claim 2 , wherein the total content of the alkali metal oxides is 2 to 7 mol %.
6. The glass composition according to claim 3 , wherein a content of ZnO exceeds 23 mol % and exceeds 10 mass %, and TiO 2 is not substantially contained.
7. The glass composition according to claim 1 , which does not substantially contain lead oxide.
8. A glass frit having the composition according to claim 1 .
9. A member provided with a glass layer having the composition according to claim 1 on a glass or ceramic substrate.
10. A member provided with a glass layer obtained by firing the glass frit according to claim 8 on a glass or ceramic substrate.