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OBSERVATION OF PHASE TRANSITIONS AT THE (100) SURFACE OFAl-3 at.% Ag

Author

Listed:
  • E. WETLI

    (Laboratorium für Festkörperphysik, Eidgenössische Technische Hochschule Zürich, CH-8093 Zürich, Switzerland)

  • M. HOCHSTRASSER

    (Laboratorium für Festkörperphysik, Eidgenössische Technische Hochschule Zürich, CH-8093 Zürich, Switzerland)

  • D. PESCIA

    (Laboratorium für Festkörperphysik, Eidgenössische Technische Hochschule Zürich, CH-8093 Zürich, Switzerland)

  • M. ERBUDAK

    (Laboratorium für Festkörperphysik, Eidgenössische Technische Hochschule Zürich, CH-8093 Zürich, Switzerland)

Abstract

In the bulk binary alloyAl-3 at.% Ag,Ag2Alprecipitates are formed below 410°C which are reversibly dissolved at elevated temperatures. We have followed this phase transition at a (100) surface as a function of temperature by monitoring the bandwidth of theAg4dstates in X-ray photoelectron spectroscopy. Since the bandwidth measures the coordination number of the emitting atoms, it directly reveals the short-range order of theAgatoms at the surface. The measurements show that the dissolution of theAg-rich clusters starts at temperatures at least 100 K below the bulk transition, and the observed hysteresis behavior is indicative of a first-order phase transition at the surface.

Suggested Citation

  • E. Wetli & M. Hochstrasser & D. Pescia & M. Erbudak, 1995. "OBSERVATION OF PHASE TRANSITIONS AT THE (100) SURFACE OFAl-3 at.% Ag," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 2(02), pages 141-145.
    • Handle: RePEc:wsi:srlxxx:v:02:y:1995:i:02:n:s0218625x95000133
    DOI: 10.1142/S0218625X95000133
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