Phase equilibria and glass formation studies in the (1-x)TeO₂-xCdO (0.05≤x≤0.33mol) system

Phase equilibria and glass formation studies of the (1-x)TeO₂-xCdO system (0.05≤x≤0.33mol) were realized by using differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The samples were prepared by applying a conventional melt-quenching technique at 800°C. The glass formation range of the system was determined as 0.05≤x<0.15 and the sample containing 10mol% CdO showed the highest glass stability. Crystallization behavior of the TeO₂-CdO glasses was investigated and formation and/or transformation of different phases were detected for each crystallization reaction. In order to obtain thermal stability of the system, as-cast samples were heat-treated above all crystallization reaction temperatures at 550°C for 24h. A binary eutectic: liquid→TeO₂+CdTe₂O₅ was detected at 638±4°C. Crystallization behavior of the TeO₂-CdO glasses and microstructural characterization of the TeO₂-CdTe₂O₅ system was realized.