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Abstract
Small-sized CdS crystals were prepared in SiO 2 and Na 2O ZrO 2 SiO 2 glasses by the sol-gel process and the oxidation of CdS crystals was investigated. Gels synthesized by the hydrolysis of a complex of metal alkoxides and Cd(CH 3COO) 2·2H 2O were heated at 500°C and allowed to react with H 2S gas to form hexagonal CdS microcrystals. CdS crystals in SiO 2 glass were sensitive to oxidation by heating in air. CdS crystals in Na 2O ZrO 2 SiO 2 glass were smaller than those in SiO 2 glass and stable against oxidation in air. The effect of glass composition on the oxidation of CdS crystals was apparent in the emission spectra of glasses soaked in methyl viologen.
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