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Phase stability investigations of the palladium-cadmium system: part i. thermodynamic studies

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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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Authors and Affiliations

  1. Square D Company, 53201, Milwaukee, WI

    Y. Maa

  2. Institut für Anorganische Chemie, Universität Wien, Vienna, Austria

    A. Mikula

  3. Department of Metallurgical and Mineral Engineering, University of Wisconsin-Madison, 1509 University Avenue, 53706, Madison, WI

    Y. A. Chang (Professor of Metallurgical Engineering)

  4. Institut für Anorganische Chemie, Universität Wien, Vienna, Austria

    W. Schuster

Authors
  1. Y. Maa
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  2. A. Mikula
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  3. Y. A. Chang
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  4. W. Schuster
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Additional information

Y. MAA, formerly Graduate Student, Materials Department, University of Wisconsin-Milwaukee

Y. A. CHANG, formerly Professor of Materials Engineering and Associate Dean for Research, Graduate School, University of Wisconsin-Milwaukee

W. SCHUSTER, formerly a Postdoctoral Research Associate, Materials Department, University of Wisconsin-Milwaukee.

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Maa, Y., Mikula, A., Chang, Y.A. et al. Phase stability investigations of the palladium-cadmium system: part i. thermodynamic studies. Metall Trans A 13, 1115–1121 (1982). https://doi.org/10.1007/BF02645491

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  • DOI: https://doi.org/10.1007/BF02645491

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