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AN UNEXPECTED SURFACE SEGREGATION PHENOMENON OF GOLD ON THE SURFACE OF APb(Au)SOLID SOLUTION

Author

Listed:
  • H. OUGHADDOU

    (CRMC2-CNRS Campus de Luminy, 13288, Marseille cedex 9, France)

  • B. AUFRAY

    (CRMC2-CNRS Campus de Luminy, 13288, Marseille cedex 9, France;)

  • J. P. BIBÉRIAN

    (CRMC2-CNRS Campus de Luminy, 13288, Marseille cedex 9, France)

  • J. BERNARDINI

    (Laboratoire de Métallurgie, URA CNRS 443, Faculté des Sciences de Saint Jérome, Marseille cedex 20, France)

Abstract

At 260°C, at the surface of a lead–gold (96·10-6at/at) solid solution we observe by Auger electron spectroscopy an unexpected surface equilibrium segregation of gold. A quantitative evaluation of the Auger data obtained at the end of the segregation kinetics shows that the segregation of gold is consistent with the formation of a surface alloy with a chemical composition close toAuPb3, with gold atoms situated under a layer of lead. We propose that this unusual segregation is related to the lower surface energy of this intermetallic compoundAuPb3compared to the gold and lead ones.

Suggested Citation

  • H. Oughaddou & B. Aufray & J. P. Bibérian & J. Bernardini, 1997. "AN UNEXPECTED SURFACE SEGREGATION PHENOMENON OF GOLD ON THE SURFACE OF APb(Au)SOLID SOLUTION," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 4(06), pages 1139-1141.
    • Handle: RePEc:wsi:srlxxx:v:04:y:1997:i:06:n:s0218625x97001437
    DOI: 10.1142/S0218625X97001437
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