Thermodynamic properties of Zn in Te-saturated ZnSe-ZnTe solid solutions

Abstract

The activity of Zn in Te-saturated ZnSe-ZnTe solid solutions was measured in the temperature range 710-845 K by an electrochemical technique using LiCl-KCl + 5 wt.% ZnCl2 as the molten salt electrolyte. From the activity data, the equilibrium vapour pressure of Zn over the solid solutions has been calculated. The e.m.f. values of the galvanic cell measured at different temperatures have been used to generate various partial and excess molar thermodynamic data, i.e. ΔGZnM, ΔGZnXS, ΔHZnM, ΔSZnM and ΔSZnXS. The continuous variation of the activity and other thermodynamic parameters with composition indicates that the system ZnSe-ZnTe consists of a single phase and forms solid solutions throughout the entire composition range. © 1994.