Thermodynamic Properties of Manganous Chloride in Alkali Chloride Melts by Electromotive Force Measurements

Abstract

Electromotive force measurements on the systems where were made using cells of the type largely in the temperature range 0°–900°C. The partial molar free energies, enthalpies, and entropies of mixing have been calculated from the emf results. The systems indicate negative deviations from ideality which are increasing from Li throughout to Cs. The concentration dependence of the partial molar enthalpies and entropies of mixing has been interpreted on the basis of the “complex ion” model previously developed which is applicable to reactive change asymmetrical fused salt mixtures. The entropy of mixing has been treated by postulating vibrational as well as a configurational contributions. The vibrational contributions have the largest negative values in the system. The effect of the vibrational contribution on the partial molar properties is also discussed.