Thermodynamic investigations of liquid gallium-cadmium alloys

Abstract

The activity of Cd in liquid Ga-Cd alloys in the 723-851 K range was determined by an electrochemical technique using LiCl-KCl+5 wt.% CdCl2 as molten salt electrolyte. The system exhibits a strong positive deviation from Raoult's law. From the activity values computed at different temperatures, the partial, integral, and excess molar thermodynamic quantities have been calculated. The composition dependence of the α-function confirms that the system does not follow a regular solution model. The analysis of Darken's stability function reiterates that though the stability is positive for all compositions, it is poor in the 0.25≤xCd≤0.45 composition range. This shows a tendency for immiscibility in this composition range.