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The Van der Waals theory of surface tension and interface structure is extended to three-phase equilibrium. The theory predicts that near a tricritical point the three interfacial tensions will satisfy "Antonoff's rule" in the form σ_αγ=σ_αβ+σ_βγ, where β is the distinguished phase, and that the composition profile of the αγ interface will be qualitatively different from that of the αβ and βγ interfaces.
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B. Widom (1975) studied this question.
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