Abstract
It is shown clearly that the Vinet equation of state (EOS) widely used in recent literature is not a new EOS. As pointed out by Stacey it is identical with the EOS derived from the Rydberg potential. We have considered several EOSs to study the behaviour of six solids viz. Ne, Ar, Cu, Al, LiH and MgO up to very high compressions. It is found that the logarithmic EOS proposed recently by Poirier and Tarantola yields results which are not consistent with the results obtained from other equations for most of the solids under study. Values of pressure ( P), isothermal bulk modulus ( K T ) and its pressure derivative ( K′ T ) calculated for the solids at different compressions have been used to assess the validity of various EOSs with help of the formulation recently developed by Stacey. The variation of K′ T with compression has been discussed in the light of recent investigations.
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