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SURFACE SEGREGATION ONAu3Cu(001)

Author

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  • S. SCHÖMANN

    (Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching bei München, Germany)

  • E. TAGLAUER

    (Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching bei München, Germany)

Abstract

In relation to investigations of the surface composition of ordered alloys in the region of their critical temperature, the elemental concentrations of the top two atomic layers of aAu3Cu(001)alloy surface were determined with low energy ion scattering in the temperature range of 300–925 K. Up to 550 K the first layer consists only of Au atoms and the second layer of Cu atoms. Above this temperature desegregration occurs; from the temperature dependence a segregation enthalpy of 47 kJ/mole could be deduced. The segregation results in a contraction of the top layer distances compared to the bulk values. The segregation kinetics can be described as an exchange process between the top atomic layers with an activation energy of 0.2–0.3 eV. The temperature dependence of the surface concentration of this alloy is determined by the segregation process rather than by the bulk ordering phase transition.

Suggested Citation

  • S. Schömann & E. Taglauer, 1996. "SURFACE SEGREGATION ONAu3Cu(001)," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 3(05n06), pages 1823-1829.
    • Handle: RePEc:wsi:srlxxx:v:03:y:1996:i:05n06:n:s0218625x96002758
    DOI: 10.1142/S0218625X96002758
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