We present a density-functional theory of the surface tension of liquid metal alloys. The theory is applied to miscible alloy Naₓ{K}_{1{{-}}x}$ and the results are similar to typical miscible alloys. The phenomenon of segregation of the low-surface-tension component to the surface is obtained with use of a simple hyperbolic tangent concentration profile. An estimation of the surface concentration is made within the monolayer surface model.
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Shih et al. (1985) studied this question.
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