Studies on the phase diagram of CaCl2–CaBr2 system

A study on pseudo-binary CaCl2–CaBr2 system was carried out using differential thermal analysis (DTA) technique covering the complete composition range of the constituents between room temperature and 1073 K. From the DTA results the contour of solidus and liquidus temperatures with composition are plotted and the phase diagram of CaCl2–CaBr2 system is constructed. The solidus and liquidus curves exhibit a minimum at 971 K and at a composition of 56.5 mol% CaBr2. Below 971 K, the system exhibits complete solid solution. Long-term equilibration of samples of several compositions was carried out at 923 and 673 K and the phases were characterized by XRD. The XRD results supported solid solution formation in the CaCl2–CaBr2 system between 673 and 923 K.