Abstract
The partial phase diagram of the CaO–TeO2 system was experimentally determined in the composition range 50–100 mole% TeO2 employing differential thermal analysis (DTA), room temperature and high temperature X-ray diffraction (XRD) and quenching technique. Only two intermediate compounds, CaTeO3 and CaTe2O5, melting congruently at 1072°C and 876°C respectively, were observed. CaTeO3 exhibited two high temperature polymorphs, β and γ, with corresponding transition temperatures at 882° and 894°C while CaTe2O5 showed three phase transformations at 802°, 845° and 857°C. The system has one eutectic reaction between CaTeO3 and CaTe2O5 at 870°C and ∼62.5 mole% TeO2, that is: L↔CaTeO3+CaTe2O5 and another one between CaTe2O5 and TeO2 at 650°C and 87 mole% TeO2, that is: L↔CaTe2O5+TeO2..
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