Process for reducing the damage susceptibility in optical qualit

Details Process for reducing the damage susceptibility in optical qualit Process for reducing the damage susceptibility in optical qualit

1993-09-22

1995-05-02

Bos, Steven

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423602, 117 2, 117941, 117944, 117 71, C01B 2526, C01G 2802, C30B 3100

Patent

active

054117232

ABSTRACT:
A process is disclosed for treating a crystal of MTiOXO.sub.4 which has crystal structure deficiencies of M and O, wherein M is selected from the group consisting of K, Rb, Tl and NH.sub.4 and mixtures thereof and X is selected from the group consisting of P, As and mixtures thereof, which includes the step of heating said crystal in the presence of a mixture of MTiOXO.sub.4 and at least one inorganic compound of one or more monovalent cations selected from the group consisting of Rb+, K+, Cs+ and Ti+ (said inorganic compound(s) being selected to provide a source of vapor phase monovalent cation and being present in an amount sufficient to provide at least a 0.1 mole % excess of the monovalent cation in relation to the M in the MTiOXO.sub.4 in said mixture) at a temperature of from about 400.degree. C. to 950.degree. C. and a pressure of at least 14 psi, and in the presence of a gaseous source of oxygen for a time sufficient to decrease the optical damage susceptibility of said crystal.

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