Abstract
An electrochemical method was used to study the Galvani potential between two coexisting equilibrium phases of molten AgI + LiCl and AgBr + LiCl systems. The method measures the electromotive force (emf) of a cell with two silver electrodes: Ag | x ′ AgI (or AgBr) + (1 − x ′ ) LiCl | x ″ AgI (or AgBr) + (1 − x ″ ) LiCl | Ag. The measurement was performed beginning with the melting point of the mixtures until reaching the temperature of full mixing, T c , to establish the Galvani potential magnitude and its temperature dependence near the critical point of mixing. It is shown that in the temperature range of 200 K below the critical mixing point, the temperature dependence of the Galvani potential for both systems is described by a universal equation, ∆E ≈ τ n , where τ = (T c − T)/T c , with the critical exponent n = 1.228.
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