Lead-free and arsenic-free niobium phosphate optical glass

Details Lead-free and arsenic-free niobium phosphate optical glass Lead-free and arsenic-free niobium phosphate optical glass

2006-08-15

2009-06-30

Ward, Jessica L (Department: 1793)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S042000, C501S045000

Reexamination Certificate

active

07553785

ABSTRACT:
The lead-free, arsenic-free, preferably gadolinium-free and fluorine-free, optical glass has a refractive index of 1.86≦nd≦1.95, an Abbe number of 19≦vd≦24, a transformation temperature of ≦595° C., preferably ≦550° C., good crystallization stability, good processing properties and production properties. The optical glass is free of Na2O, frre of B2O3and has a composition (based on oxide content in % by weight) of P2O5, 14-31; Nb2O5, 22-50; Bi2O3, 5-36; WO3, >10-25; GeO2, 0-14; Li2O, 0-6; K2O, 0-6; Cs2O, 1-7; MgO, 0-6; CaO, 0-6; SrO, 0-6; BaO, 0-6; ZnO, 0-6; TiO2, 0-4; Σ alkali oxides, 2-12; Σ alkaline earth oxides, 0-10; Σ Nb2O5, WO3, Bi2O3≦50 and fining agents, 0-2.

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