Synthesis and characterization of new amorphous and crystalline phases in Bi2O3-Ta2O5-TeO2 system

A glass-forming domain is found and studied within Bi2O3- Ta2O5-TeO2 system. The glasses obtained in the system Ta2O5-TeO2 was investigated by DSC, Raman and Infrared spectroscopy. The influence of a gradual addition of the modifier oxides Ta2O5 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 Ta2O5 content. The density of glasses has been measured. The investigation in the TeO2- Ta2O5 system using XRD reveals new phases.