Calculation of activities in some gallium-based systems with a miscibility gap

Abstract

The calculations of thermodynamic properties in some gallium-based systems with a miscibility gap – Ga–Tl, Ga–Hg and Ga–Pb are presented in this paper. The determination of the gallium activities in the mentioned liquid alloys was based on their known phase diagrams using the Zhang-Chou method for calculating activities from phase diagrams involving two liquid or solid coexisting phases. The activities of gallium in Ga–Tl, Ga–Hg and Ga–Pb system were calculated in the 973–1273 K, 573–873 K and 1000–1100 K, temperature ranges, respectively. The activities of the other component in all the investigated systems were obtained by the Gibbs-Duhem equation. The results of the calculations are compared with literature data.

Keywords

• thermodynamic calculation
• Ga–Tl
• Ga–Hg
• Ga–Pb systems
• phase diagrams
• miscibility gap