Glasses formation, characterization, and crystal-structure determination in the Bi₂O₃-Sb₂O₃-TeO₂ system prepared in...

A glass-forming domain is found and studied within Bi₂O₃-Sb₂O₃-TeO₂ system. The glasses composition were obtained in pseudo-binary xSbO_1.5, (1-x)TeO₂ for 0.05 ≤ x ≤ 0.20. The constitution of glasses in the system Sb₂O₃-TeO₂ was investigated by DSC, Raman, and Infrared spectroscopy. The influence of a gradual addition of the modifier oxides on the coordination geometry of tellurium atoms has been elucidated based Infrared and Raman studies and showed the transition of TeO₄, TeO₃₊₁, and TeO₃ units with increasing Sb₂O₃ content. XRD results reveal the presence of three crystalline: γ-TeO₂, α-TeO₂, and SbTe₃O₈ phases during the crystallization process. The density of glasses has been measured. The investigation in the ternary system by the solid state reaction using XRD reveals the existence of a solid solution Bi_1- Sb_1- Te₂ O₄ isotopic to BiSbO₄ with 0 ≤ x ≤ 0.1.