Surface Tensions for Liquid Polyvalent Metals

The Gibbs-Bogoliubov variational perturbation method has been generalised and applied to the study of surface tensions of liquid polyvalent metals. The calculation is made tractable by combining the above variational theory with the Generalised Nonlocal Model Pseudo-potential of Li et al recently developed for the calculations of the energetics of liquid polyvalent metals. An important feature in the present work is that it allows us to go beyond the linear screening approximation albeit in a somewhat average way. The results of computations show that the surface tensions of liquid polyvalent metals can be reasonably accounted for provided an accurate Helmboltz free energy, higher-than-second order corrections and a more realistic approximation on the interionic terms are all properly considered.

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