Calculation of excess enthalpies for binary mixtures of liquid metal halides

Abstract

A semi-empirical equation, based on simple regular solution theory and involving only dispersion and charge–dipole interactions, is deduced for the excess enthalpy, H^E, of a family of molten salt mixtures. The hard-core separation, λ, calculated from scaled particle theory, is adopted for the anion-cation separation in the melt. When the excess enthalpies at the equimolar composition, calculated from the derived equation, are compared with the experimental H^E values available for 37 of the possible 40 binary alkali halide mixtures with a common anion, almost perfect agreement is obtained.