Abstract
Atomic absorption spectroscopy was used to measure the thermodynamic activity of zinc at 643°K in solid ϵ phase AuZn alloys. Data were obtained by measuring the attenuation of the resonance line of zinc at 3076 Å by zinc vapor in equilibrium, with the alloy contained in an evacuated, sealed quartz cell. Relative partial molar and excess relative partial molar quantities were calculated from the data. The results indicate a decrease in slope of the activity coefficient of zinc with respect to mole fraction at approximately the same composition at which Massalski and King observed a reversal in the crystallographic axial ratio. The occurence of this anomaly in the thermodynamic data is also attributed to a zone overlap. The stability function, as proposed by Darken, was also evaluated for these alloys. It indicates the presence of a miscibility gap in the system.
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