Calculation of phase diagrams of binary salt mixtures with a common anion

Abstract

In order to calculate excess chemical potentials of the components in binary molten salt mixtures, a simple model is proposed which requires three physical parameters for each salt: the crystal lattice energy, the latent heat of melting and the sum of the ionic radii. The model has been used to calculate the liquidus temperature for various compositions of the binary system. Calculated and experimentally determined phase equilibria for the following systems are compared: LiF–KF, LiF–NaF, NaF–KF, LiCl–KCl, NaCl–CsCl, LiNO₃–NaNO₃, CaF₂–MgF₂, LiF–CaF₂, NaF–CaF₂ and NaCl–SrCl₂.