Patent ID: 7407902
Filing Date: 2008-08-05
Classification: C03C,Y10T

Abstract:
1. A Bismuth glass composition comprising 1.7 to 12 wt % of SiO 2 , 3 to 9 wt % of B 2 O 3 , 9.5 to 19 wt % of ZnO, 62 to 80 wt % of Bi 2 O 3 and 0.1 to 4 wt % of Al 2 O 3 , and further comprising 5 wt % or less of an oxide of Group A, 12 wt % or less of an oxide of Group B and 0.1 to 10 wt % of an oxide of Group C, wherein the oxide of Group A is at least one selected from the group consisting of Li the oxide of Group B is at least one selected from the group consisting of MgO, CaO, SrO and BaO, and the oxide of Group C is at least one selected from the group consisting of Sc the weight ratio of Al