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

E. Wetli, M. Hochstrasser, D. Pescia and M. Erbudak
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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

Surface Review and Letters (SRL), 1995, vol. 02, issue 02, 141-145

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.

Date: 1995
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DOI: 10.1142/S0218625X95000133

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