THERMODYNAMIC ANALYSIS OF PHASE-EQUILIBRIA IN THE COPPER-(I) HALIDE-SYSTEMS

Free enthalpy of mixing in the molten salt systems SnBr2 - CuBr and SnI2 - CuI, over the whole range of compositions, was determined on the basis of liquidus data. The magnitude as well as the sign of deviations from ideal behaviour (Temkin's model and Forland's model) are different in these two systems, what is consistent with their phase diagrams. In the SnBr2 - CuBr system, forming a solid compound, free enthalpy of mixing is negative and of higher absolute value. In the SnI2 - Cul system, of the eutectic type, free enthalpy of mixing is positive and smaller.