Application of simple perturbation theory to uni-univalent molten salts

Abstract

A simple perturbation theory for molten salts has been examined using the restricted primitive model fluid as the reference of the perturbation. The internal energy and the compressibility factor of the reference system have been correlated using the Padé approximation as developed by Larsen. The weak long-range attractive potentials are accounted as the perturbation terms, in which the first-order perturbation terms with respect to the temperature were retained. The internal energy and the compressibility factor of molten potassium chloride calculated using this perturbation theory satisfactorily agree with the results of the Monte Carlo simulation. The effect of the ion-size difference between unlike ions is also discussed.