Crystallization Behavior of SnO₂-Doped ZnO-Al₂O₃-SiO₂ Glass

Abstract

The effect of the addition of SnO₂ on the crystallization behavior was investigated for ZnO-Al₂O₃-SiO₂ glass, which can be used to produce transparent crystallized glass. Addition of SnO₂ promoted nucleation, and nucleation proceeded most actively at 775°C after the heat treatment of 24 hours. During crystallization, ZnAl₂O₄ and Al₆Si₂O₁₃ precipitated, but Al₆Si₂O₁₃ changed to ZnAl₂O₄ at temperatures above 1000℃. SnO₂ is dissolved in ZnAl₂O₄ as a solid solution, but SnO₂ in the solid solution is metastable and precipitated as stable SnO₂ at high temperatures.