Predicting the liquid-vapor critical point from the crystal anharmonicity

A "universal" dependence is predicted of the reduced critical parameters, k BTc/E0(gamma), Vc/V0(gamma), and P-c/V-c/k(B)T(c). = Z(c)(gamma), on the cr ystal anharmonicity gamma (closely related to the Gruneisen parameter Gamma (G)) It is based on a simplified embedded-atom type approach which enables one to utilize the universal zero-temperature equation of state in a versio n of fluid perturbation theory. This model's critical temperature and densi ty agree with the experimental results for both the heavy rare gases (gamma similar or equal to 2.85) and heavy alkali metals (gamma similar or equal to 1.35). Predicted critical parameters for many other Liquid metals are co nsistent with previous estimates, but the model is not applicable when dire ctional bonding is important.