Abstract
The vapor pressure of cadmium in palladium-cadmium alloys was determined between 830 and 1350 K and between 33 and 65 at. pct Cd by two different isopiestic methods. An analysis of the resulting partial molar quantities of Cd in the β1-phase in terms of Chang's theoretical model for the Ll0-structure yielded a disorder parameter α= 7 × 10-4 and a second-nearest neighbor parameter η = 0.75 at 1073 K. Available literature data for the thermodynamic activities of Cd in the α-phase (solid solution of Cd in Pd) were evaluated using a subregular solution model. By combining these values with the present experimental data, all relevant partial and integral thermodynamic properties for the α- and β1-phase could be derived. At the stoichiometric composition of the β1-phase, values of ΔG = -38.0 kJ(g-atom)-1 and ΔH = -53.7 kJ(g-atom)-1, referred to Pd(s) and Cd(l), were obtained for a temperature of 1073 K.
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