In Situ High-Temperature X-ray Observations of Crystallization of Zinctellurite Glass

Abstract

A reliable fabrication process of non-silica glasses is required to suppress crystallization. The crystallization behavior of zinctellurite (ZnO–TeO₂) glass at different rates of heating and cooling were studied by an in situ high-temperature X-ray diffractometer (a rapid measurement system) and differential thermal analysis (DTA). The DTA results compared with the X-ray diffraction data resulted in crystallization and phase relations, during heating and cooling, of the glass. During the heating process, α-TeO₂ and ZnTeO₃ were found to crystallize first, followed by the crystallization of Zn₂Te₃O₈. While during the cooling process from melt, α-TeO₂ was found to crystallize first, followed by the crystallization of Zn₂Te₃O₈. The present study results in reliable data of the crystallization process and presents a possibility of an approach to make accurate T-T-T diagram which can show the crystallization tendency.