The Effect of B₂O₃ and GeO₂ on the Crystallization of ZnO-Al₂O₃-SiO₂ Glass

Abstract

The addition of B₂O₃ and GeO₂ to ZnO-Al₂O₃-SiO₂ glasses decreased the crystallization peak temperature measured by DTA and also decreased the temperature where nucleation rate becomes maximum. ZnAl₂Si₂O₈, Al₆Si₂O₁₃ and ZnAl₂O₄ precipitated when ZnO-Al₂O₃-SiO₂ glass crystallizes, and Al₆Si₂O₁₃ and ZnAl₂O₄ are transformed to ZnAl₂O₄. The addition of B₂O₃ and GeO₂ suppressed the precipitation of ZnAl₂Si₂O₈ and Al₆Si₂O₁₃. The addition of of GeO₂ promoted the nucleation of ZnAl₂O₄.