Thermodynamics of solid argon at high temperatures

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Abstract
Recent high-pressure equation-of-state data for Ar are analysed to obtain entropy, internal energy, and specific heat values for solid Ar from 84K to the melting curve at molar volumes from 21 to 24 cm3 mol-1. These equation-of-state data are also used to reanalyse earlier specific heat data along the vapour-pressure curve. The resulting thermodynamic properties are compared with theoretical calculations based on the best intermolecular potentials for Ar, and some minor inadequacies in the potentials are pointed out. These data along with the theoretical calculations provide the basis for an extensive analysis of anharmonic effects in solid Ar, and it is concluded that all the high-temperature data are consistent with a quadratic temperature dependence for the anharmonic contribution to the Helmholtz potential.

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