The Thermodynamic Properties of Liquid Transition and Rare‐Earth Metals Based on CHS Model

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Abstract
The thermodynamic properties of liquid transition and rare‐earth metals are discussed on the basis of CHS model. The validity of the Gibbs‐Bogolyubov inequality within the thermodynamic perturbation theory is assumed. The small perturbation term is approximated by s‐d hybridisation energy in the atomic sphere approximation. The results indicate that the method yields thermodynamic quantities quite in agreement with the OCP model and much better than corresponding hard sphere results. Unlike the OCP model the expressions are obtainable analytically and in this sense the model is advantageous. The role of charge and packing on entropy calculation is also discussed in some length.