Abstract
A useful general equation of state based on thermodynamic analysis is proposed to investigate the properties of solids under the effect of high pressures. It is shown that the Murnaghan equation of state widely used in the literature is a particular case of the proposed equation of state. The equation of state is applied to investigate the compression behaviour of solids up to their transition pressures. The results are found to present a better agreement with the experimental data as compared with the Murnaghan equation of state of high pressures. It is concluded that the Murnaghan equation of state holds good only in the low pressure range, ∼ 40 kbar, while the equation of state proposed in the present paper is fairly applicable from atmospheric pressure up to the transition pressures of solids.
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