Heat Capacity at Constant Pressure along the Crystallization and Melting Line of Argon

In this work, the main characteristics of the crystal–homogeneous phase transition in argon are calculated on the basis of the correlation cell-cluster expansion. Along the crystallization and melting line, the heat capacity at constant pressure is calculated for the crystalline phase and for the homogeneous phase. A monotonic decrease of the heat capacity at constant pressure with increasing temperature is observed. A comparison between theoretical data and experimental results is carried out, showing good agreement.