Abstract
Silver segregation on a (100) surface of Al-3 at. % Ag, induced by heat treatment, is studied at temperatures up to 480 \ifmmode^\circ\else\textdegree\fi{}C. The surface concentration of silver is monitored with Auger-electron spectroscopy, while its geometry is determined with low-energy electron diffraction. The measurements show that the segregation results in a Ag concentration of up to 30 at. % at the surface which forms a disordered overlayer. The electronic information about the Ag atoms, obtained both by means of x-ray-photoelectron and electron energy-loss spectroscopy, reveals that ${\mathrm{Ag}}_{2}$Al-like clusters segregate to the surface at temperatures ranging up to 440 \ifmmode^\circ\else\textdegree\fi{}C. At higher temperatures, the clusters reversibly dissolve, in agreement with the bulk phase diagram, without changing the average Ag concentration at the surface.
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