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Abstract
The activity coefficient and the heat of mixing of molten alkali-halide mixtures with a common ion are analyzed through the use of thermodynamic fluctuation theory and of a charged-hard-spheres model for the ionic interactions. A strain contribution is isolated and evaluated with the help of experimental data, and a Coulomb contribution is estimated within the mean spherical approximation. The difference between these contributions and experiment is attributed to electronic polarizability of the ionic cores by displaying its correlation with appropriate polarization parameters.