Phys. Rev. B 75, 104209 (2007) [7 pages]X-ray reflectivity studies of atomic-level surface-segregation in a liquid eutectic alloy of AuSnReceived 27 November 2006; revised 2 February 2007; published 29 March 2007 X-ray reflectivity studies reveal atomic-level surface-segregation at the free surface of the eutectic Au71Sn29 liquid alloy. The surface-segregation extends up to three layers, in which the top layer is almost a pure monolayer of Sn, the second layer is almost a pure monolayer of Au and the third layer appears to be slightly enhanced in Au. Although the surface-segregation concentration profiles can be qualitatively accounted for by the theories of Defay-Prigogine and Strohl-King, they cannot satisfactorily account for the measured surface tension. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.104209
DOI:
10.1103/PhysRevB.75.104209
PACS:
61.20.−p, 61.10.−i, 68.03.−g
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