Synthesis and characterization of new amorphous and crystalline phases in Bi2O3–SrO–TeO2 system

Tellurite glasses containing strontium and bismuth oxides have been prepared at 800 °C and investigated by X-ray diffraction, differential scanning calorimetry and infrared. The crystalline phases of glasses in TeO2–SrO revealed γTeO2 phase which transforms into the stable αTeO2 phase up to 500 °C. Infrared study shows the transition of TeO4, TeO3+1 and TeO3 units with increasing SrO content. The value of refractive index and density of glasses have been measured. The investigation in the system by the solid-state reaction technique using XRD reveals a new phase Bi2Te6SrO16.