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Phase stability investigations of the palladium-cadmium system: part ii. structural studies

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Abstract

The crystal structure and the precise lattice parameters of palladium-cadmium alloys containing 33 to 60 at. pct Cd were determined by X-ray diffraction at 294 K, using samples quenched from 1073 K. The results indicate that at 1073 K the β1(Ll0) phase extends from 33 to 55 at. pct Cd while the β′(B2) phase is stable from 56 to 60 at. pct Cd. No evidence for the existence of a separate high-temperature phase between the β, and β′ phase fields was found. A modification of the currently accepted Pd-Cd phase diagram near the equiatomic composition is proposed. The lattice parameters of the fct β1 - phase have the following values at the stoichiometric composition:a = 0.4 2817 nm,c = 0.3 6310 nm. The molar volume of the β1-phase is a linear function of composition from 33 to 50 at. pct Cd. The partial molar volumes of Pd and Cd have the following values in this range: VPd = 8.87 cm3/g-atom, VCd = 11.18 cm3/g-atom. An analysis of Pd-and Pt-based Ll0 phases indicates that the c/a ratio of these phases is related to their enthalpy of formation. Phases with a small enthalpy of formation have a high c/a ratio while phases with a large enthalpy of formation exhibit a small c/a ratio.

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Authors and Affiliations

  1. Department of Chemical and Metallurgical Engineering, University of Alabama, University, 35486, AL

    J. P. Neumann (Associate Professor of Metallurgical Engineering)

  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)

Authors
  1. J. P. Neumann
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  2. A. Mikula
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  3. Y. A. Chang
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Y. A. CHANG, formerly Professor of Materials Engineering and Associate Dean for Research, Graduate School, University of Wisconsin-Milwaukee

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Neumann, J.P., Mikula, A. & Chang, Y.A. Phase stability investigations of the palladium-cadmium system: part ii. structural studies. Metall Trans A 13, 1123–1126 (1982). https://doi.org/10.1007/BF02645492

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