Optimized Equilibrium Phase Diagram and Solution Thermodynamics of Arsenic-Lead Alloys

摘要

The thermodynamic properties of solid and liquid arsenic-lead alloys have been analyzed from the available literature sources. The excess Gibbs energies for the alloy phases were modelled by using orthogonal Legendre polynomials and the mathematical analysis was carried out by using the Lukas program. The following integral excess Gibbs energies were estimated for the alloy phases; liquid and solid lead (fcc-solid solution): G(Liq) = X(As)X(Pb)(5068.9 - 4.79625T - 2966.3 (X(As)-X(Pb)) (J/mol) and G(fcc) = X(As)X(Pb)17517.9 (J/mol). The eutectic equilibrium was calculated. The temperature dependent functions of the activity coefficients of the components at infinite dilution in liquid lead and arsenic, respectively, were calculated from the optimized parameters: Inf(sup 0)(As) = -0.577+966.5/T and Inf(sup 0)(Pb) = -0.577+252.9/T.