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Abstract
SiO2 and 1.4Na2O20.8ZrO277.8SiO2 glasses doped with small-sized CdS crystals were prepared by the sol-gel process. Gels synthesized by the hydrolysis of Si(OC2H5)4, Zr(OC3H7)4, NaOCH3 and Cd(CH3CO2)22H2O were heated at 500°C, and then allowed to react with H2S gas to form the glasses doped with hexagonal CdS microcrystals. The degradation of the glasses was investigated with respect to the oxidation of CdS crystals. CdS crystals were incompletely embedded in the porous silica glass with high specific surface area. When heated, CdS crystals were oxidized in air at temperatures from 300 to 500°C and disappeared from glass at temperatures from 500 to 700°C in nitrogen atmosphere. On the other hand, 1.4Na2O20.8ZrO277.8SiO2 gel shrank at lower temperatures, in which CdS crystals were embedded. CdS crystals doped in the glass were stable against oxidation even though heated 500°C in air.
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