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Integral and differential (with respect to the composition) isotherms of changes in the interfacial free energy (σm– σ), the charge density q, and the surface composition X Au ωof alloys equilibrated with an aqueous surface-inactive electrolyte are obtained in terms of a finite-thickness interfacial layer, with use of concentration dependences of activity coefficients of components of a polycrystalline binary alloy. Using ac measurements of the double-layer parameters, it is stated that the surface-active component in the Ag–Au|F–, H2O and Ag–Au|ClO– 4, H2O systems at 298 K is gold. The Ag–Au solid solution shows negative deviations from Raoult's law, except for the compositions X Au≤ 0.04 and X Au≥ 0.80, where the solid solution properties approach those of an ideal solution. |
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