Das, S K and Chaudhuri, A K and Biswas, N and Thiagarajan, S (1989) Development of photochromic ophthalmic glass. Transactions of the Indian Ceramic Society, 48 (1). 1-4, 10. ISSN 0371-750X

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Abstract

Melting conditions of photochromic glasses of the ophthalmic variety were investigated. Melting consisted of two parts, viz. a pyrex type glass and then a photochromic composition with the premelted glass. The method followed suppressed the loss of halides from the molten glass by reducing the melting time. Alkali-halide-saturated air cover over the melt surface was found necessary to make the glass photochromic. Ophthalmic specifications were attained by replacing part of the alkalis by PbO and BaO for matching index and Abbe values. Absorption studies indicated the formation of AgCl1-x Brx type crystallites with sizes ranging from 100 to 500 Å during heat treatment of the glass.

Item Type:	Article
Subjects:	Glass
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	06 Dec 2013 08:43
Last Modified:	05 Mar 2016 13:35
URI:	http://cgcri.csircentral.net/id/eprint/2442

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