Correlations of the surface tension and some thermodynamic and transport properties of the alkali metal halides at their melting temperatures based on their corresponding molar volumes

•Modeling thermo-physical properties of alkali halide melts based only on its melting point and molar volume.•All properties can be easily determined from known constants.•The product of the isothermal compressibility and the surface tension is found to be equal to 0.131% of the internuclear distance.•All the results are compared well with existing experimental data.

Approximate expressions are proposed to determine the surface tension (γγ), isothermal compressibility (kTkT), cohesive energy density (CeD  ), surface tension and compressibility product (kTγkTγ), viscosity (ηη), self-diffusion coefficients (DCM+DCM+ and DCX−DCX−) and cation–anion internuclear distance (D) of molten alkali halides, at melting temperatures (T). The validity of these expressions is tested for all the molten alkali halides, and the expressions hold well in most cases.

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