Constitution of porcelain before and after heat-treatment .1. mineralogical composition

Porcelain compositions were prepared with and without the addition of mineralizers/nucleating agents and their phase assemblages were studied before and after subjecting them to heat-treatment. Mullite, quartz and glass were defected in the compositions before hear-treatment, but cristobalite appeared as an additional phase after heat-treatment. Heat-treated compositions were comparatively rich in mullite following crystallization from the glassy phase. Nb2O5 was the most efficient nucleating agent among those tried