Abstract
A microscopic approach to considering the influence of atomic local static displacement (ASD) on binary alloy thermodynamic properties has been developed. An equation that permits the calculation of ASD amplitudes from first principles has been derived. The value of the ASD amplitude is shown to depend on the difference in the effective interatomic potentials of the alloy components. The expression for the alloy free energy, which takes the ASD into account, is obtained by the collective variables method. The theoretical results are illustrated by numerical calculations, performed for alloys of the K-Rb system. The dependence of the ASD squared, averaged over configurations, on temperature and alloy concentration has been investigated, in particular.
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