Atomic-Scale Surface Demixing in a Eutectic Liquid BiSn Alloy

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Atomic-Scale Surface Demixing in a Eutectic Liquid BiSn Alloy

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Title: Atomic-Scale Surface Demixing in a Eutectic Liquid BiSn Alloy
Author: Shpyrko, Oleg G.; Grigoriev, Alexei Yu.; Streitel, Reinhard; Pontoni, Diego; Pershan, Peter S.; Deutsch, Moshe; Ocko, Ben; Meron, Mati; Lin, Binhua

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Citation: Shpyrko, Oleg G., Alexei Yu. Grigoriev, Reinhard Streitel, Diego Pontoni, Peter S. Pershan, Moshe Deutsch, Ben Ocko, Mati Meron, and Binhau Lin. 2005. Atomic-scale surface demixing in a eutectic liquid BiSn alloy. Physical Review Letters 95(106103).
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Abstract: Resonant x-ray reflectivity of the surface of the liquid phase of the Bi43Sn57 eutectic alloy reveals atomic-scale demixing extending over three near-surface atomic layers. Because of the absence of an underlying atomic lattice which typically defines adsorption in crystalline alloys, studies of adsorption in liquid alloys provide unique insight on interatomic interactions at the surface. The observed composition modulation could be accounted for quantitatively by the Defay-Prigogine and Strohl-King multilayer extensions of the single-layer Gibbs model, revealing a near-surface domination of the attractive Bi-Sn interaction over the entropy.
Published Version: doi:10.1103/PhysRevLett.95.106103
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