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The variational [1] method with the additive hardsphere (HS) reference system had been applied to investigation of binary liquid metal alloys for the first time in the work [2]. Since then, it continues to be used in this field (for example, [3–10]; see also the review [11]). In our previous studies of liquid alkali-metal’s alloys [12– 15] by different methods of the thermodynamic perturbation theory (TPT) including the variational one, it was shown that the Animalu–Heine (AH) model pseudopotential (MP) [16] in the local approximation [17] allows to obtain very good results for such thermodynamic characteristics as the Helmholtz free energy, internal energy, entropy, and their mixing quantities. In the present work, the applicability of the named pseudopotential for calculating the bulk moduli of liquid alkali-alkali metal alloys is estimated on the example of Na–K, Na–Cs, and K–Rb equiatomic alloys near their melting temperatures in the framework of the HS variational method.

The Variational Calculation of Bulk Moduli for Liquid Binary Alloys of Alkali Metals