Abstract
Three batch compositions of pure oxides (SiO2, Fe2O3, PbO, Na2O) with equivalent SiO2, Fe2O3 and PbO contents and a gradually increased Na2O content were vitrified through heating in a high temperature electric furnace and subsequent quenching. The resulting vitreous products were thermally treated in order to study the devitrification behaviour, under conditions designated from differential thermal analysis experiments. Depending on the Na2O content, crystal phase separation gave rise to the growth of acmite and hematite or maghemite. A uniformly phase separated glass-ceramic material, with crystallites of similar size and population density, was produced from devitrification of the vitreous product with the higher Na2O content.
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