Highly refractive optical glass with refractive indices >1.83

Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...

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501 74, 501 75, 501 77, 501 78, 501901, C03C 3062

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047343893

ABSTRACT:
A highly refractive optical glass (n.sub.d .gtoreq.1.83) with high dispersion (v.sub.d .ltoreq.25) and very good chemical stability at relatively low density (.delta..ltoreq.3.5 g/cm.sup.3) consists of (in weight percent) SiO.sub.2 19-25, Na.sub.2 O 7-10, K.sub.2 O 4-7, Cs.sub.2 O 0-12, Cao 0.5-2.0, BaO 9-15, TiO.sub.2 25-30, ZrO.sub.2 0-6, Nb.sub.2 O.sub.5 16-20, WO.sub.3 0-3, with Nb.sub.2 O.sub.5 :TiO.sub.2 =0.6-0.71.

REFERENCES:
patent: 3870531 (1975-03-01), Jahn
patent: 4526874 (1985-07-01), Grabowski et al.
patent: 4584279 (1986-04-01), Grabowski et al.

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