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Abstract <p>The thermal and caloric properties of crystalline argon along the sublimation line are calculated in the present work. For this purpose, a correlation cell-cluster expansion is used. Along the sublimation line, there is a monotonic increase in the molar volume, as well as in the pressure with increasing temperature. At the same time, for temperatures below <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(60\)</EquationSource> <!--BPhysMGU2570336Nikolaev-m1--> </InlineEquation> K, the pressure becomes 100 times lower than the triple point pressure, and then rapidly decreases. As for the molar volume, it remains virtually constant at temperatures below <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(10\)</EquationSource> <!--BPhysMGU2570336Nikolaev-m2--> </InlineEquation> K. The heat capacity at constant pressure for the crystalline phase increases monotonically with increasing temperature. A comparison of the theoretical data with the experimental data is performed, and good agreement is obtained for all considered regions, except in the case of the heat capacity at temperatures below <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(3\)</EquationSource> <!--BPhysMGU2570336Nikolaev-m3--> </InlineEquation> K, where collective interactions must be taken into account.</p>

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Thermal and Caloric Properties of Crystalline Argon along the Sublimation Line

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • P. N. Nikolaev

摘要

Abstract

The thermal and caloric properties of crystalline argon along the sublimation line are calculated in the present work. For this purpose, a correlation cell-cluster expansion is used. Along the sublimation line, there is a monotonic increase in the molar volume, as well as in the pressure with increasing temperature. At the same time, for temperatures below \(60\) K, the pressure becomes 100 times lower than the triple point pressure, and then rapidly decreases. As for the molar volume, it remains virtually constant at temperatures below \(10\) K. The heat capacity at constant pressure for the crystalline phase increases monotonically with increasing temperature. A comparison of the theoretical data with the experimental data is performed, and good agreement is obtained for all considered regions, except in the case of the heat capacity at temperatures below \(3\) K, where collective interactions must be taken into account.