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Tellurite glasses containing calcium and bismuth oxides have been prepared at 800°C and investigated by X-ray diffraction, DSC, IR and Raman spectroscopy. The crystalline phases of glasses in TeO 2 –CaO revealed γTeO 2 phase which transforms into the stable αTeO 2 phase up to 500°C. IR and Raman studies show the transition of TeO 4 , TeO 3+1 and TeO 3 ...
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