Abstract

A quantum statistical approach is utilized to give a unified treatment of the metal-non-metal and liquid-vapour transition in expanded mercury. An equation of state is proposed with respect to thermodynamic stability. The resulting coexistence curve and the location of the critical point are in good agreement with experimental data. The static structure factor is calculated along the coexistence line within the MHNC approximation. The limiting cases of the metallic liquid and the insulating vapour are treated by an effective ion-ion interaction potential derived within the nearly free electron model and a Lennard-Jones potential, respectively. The resulting structure factors are compared with experiments.

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