Heat capacity of neon, argon, krypton and xenon crystals at high temperatures

The heat capacity of rare gas crystals is studied in the paper. For this, the cell-cluster expansion for the free energy is used, taking into account three-particle clusters, inclusive. The self-consistent field approximation is used as the basic approximation. The calculations performed for neon, argon, krypton and xenon showed good agreement between the theoretical results and experimental data. This also applies to regions at normal pressure for krypton and xenon, where the heat capacity at constant volume decreases with increasing temperature.