Glass Formation and Phase Transformations in the TeO2–ZnO–MoO3 System

Abstract

The article examines a glass-forming region in the ternary TeO₂–ZnO–MoO₃ system at two melt cooling rates. Glasses containing up to 80 mol.% molybdenum trioxide were obtained with varying TeO₂/ZnO ratios. X-ray diffraction (XRD) was used to study the phase formation in the batch and glass samples under thermal treatment. No significant interaction between the initial binary oxides was observed in the temperature range of 20 – 300°C. However, further heating led to the formation of complex oxides of tellurium (IV), zinc, and molybdenum (VI), including Te₂MoO₇, Zn₂Te₃O₈, ZnMoO₄, and ZnTeMoO₆. These phases were also formed during controlled glass crystallization. The transmission spectra of the glasses exhibited a redshift of the absorption edge with an increase in molybdenum trioxide content.