Thermodynamics of multicomponent systems. The quasichemical approximation

Abstract

Thermodynamic functions to the second order in terms of the nearest‐neighbor interactions are derived for a multicomponent system. Expressions for the energy of mixing ΔE, the excess free energy G^E, and the partial excess free energy of mixing of the component r, ${Ḡ}_r^E$ , are derived. The expressions are an improvement over the regular solution model, particularly in calculating phase boundaries.