High-refractive index phototropic glass

Details High-refractive index phototropic glass High-refractive index phototropic glass

1994-06-10

1995-06-13

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 77, C03C 406, C03C 3064

Patent

active

054242550

ABSTRACT:
A high-refractive index phototropic glass having a refractive index of 1.69 to more than 1.7, an Abbe coefficient of at least 35 and a density of at most 3.5 g/cm.sup.3, has a composition (in % by weight based on oxide) of: SiO.sub.2 15-33; B.sub.2 O.sub.3 12-22; .SIGMA. SiO.sub.2 +B.sub.2 O.sub.3 30-50; Li.sub.2 O 0.5-5.0; Na.sub.2 O 0-3; K.sub.2 O 0-11; .SIGMA. alkali oxides 4-12; BaO 0-23; SrO 0-23; .SIGMA. SrO+BaO 0-23; ZrO.sub.2 5-14; Nb.sub.2 O.sub.5 15-24; Ta.sub.2 O.sub.5 2-11. As the carrier of the phototropism, the glass also has 0.10 to 0.35 of Ag.sub.2 O; 0.15-0.65 of Cl; 0.15-0.45 of Br and 0.005-0.030 of CuO. The glass can also be doped with 1-3 ppm of gold or one or more platinum metals, especially palladium.

REFERENCES:
patent: 4084978 (1978-04-01), Sagara
patent: 4149896 (1979-04-01), Faulstich et al.
patent: 4251278 (1981-02-01), Hares
patent: 4486541 (1984-12-01), Gliemeroth et al.
patent: 5217927 (1993-06-01), Behr et al.

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