Abstract
The formation of CaO-SiO2 glasses, which could not have been prepared with the conventional glass-melting technique because of the presence of the stable liquid-liquid immiscibility zone, was investigated by the gel method. The monolithic transparent glasses of CaO·9SiO2 and CaO·4SiO2 composition were obtained by slowly heating to 800° C the transparent gels formed by hydrolysis with atmospheric moisture. In this binary system, the promotion of hydrolysis by the addition of water was not so favourable, because it caused the precipitation of the hydrolysed product, i.e. Ca(OH)2, and therefore the gels obtained were translucent or opaque. The values of true density and refractive index measured for the transparent glasses were comparable with those calculated from the corresponding compositions. Crystallization occured during heat-treatment above 800° C and wollastonite was precipitated.
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