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

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.