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

H. Oughaddou, B. Aufray (), J. P. Bibérian and J. Bernardini
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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

Surface Review and Letters (SRL), 1997, vol. 04, issue 06, 1139-1141

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.

Date: 1997
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DOI: 10.1142/S0218625X97001437

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