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A noncrystalline Pt-Sb phase and its equilibration kinetics

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Abstract

Utilizing splat cooling, a metastable noncrystalline phase was obtained in Pt-Sb alloys with 30 to 43 pct Sb and in Pt-Si alloys with the eutectic composition Pt-68 Si. These nonequilibrium structures can be retained indefinitely at room temperature. The kinetics of the decomposition of the metastable noncrystalline phase in a Pt-34 pct Sb alloy was studied in detail by X-ray diffraction, electron diffraction, and electron transmission microscopy. The decomposision starts at an appreciable rate at about 210°C, and progresses gradually with the precipitation of relatively equiaxed grains of crystalline phases. From isothermal kinetic data, average activation energies from 55.5 to 49.5 (±4) kcal per mole were derived for the overall decomposition process.

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Authors and Affiliations

  1. Carbon and Metals Division, Union Carbide India, Ltd., Calcutta, India

    P. K. Srivastava

  2. Northeastern University, Boston, Mass.

    B. C. Giessen (Associate Professor of Chemistry)

  3. Department of Metallurgy and Materials Science, M.I.T, USA

    N. J. Grant (Professor)

Authors
  1. P. K. Srivastava
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  2. B. C. Giessen
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  3. N. J. Grant
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Additional information

Formerly Research Assistant, Department of Metallurgy and Materials Science, Massachusetts Institute of Technology, Cambridge, Mass.

Formerly Research Associate, Department of Metallurgy and Materials Science, M.I.T.

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Srivastava, P.K., Giessen, B.C. & Grant, N.J. A noncrystalline Pt-Sb phase and its equilibration kinetics. Metall Trans 3, 977–982 (1972). https://doi.org/10.1007/BF02647675

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