Pairing Interactions and Gibbs Adsorption at the Liquid Bi-In Surface: A Resonant X-Ray Reflectivity Study
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Shpyrko, O. G.
Ocko, B. M.
Berman, L. E.
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CitationDiMasi, E., H. Tostmann, O. G. Shpyrko, P. Huber, B. M. Ocko, Peter S. Pershan, M. Deutsch, and L. E. Berman. 2001. Pairing interactions and Gibbs adsorption at the liquid Bi-In surface: A resonant x-ray reflectivity study. Physical Review Letters 86(8): 1538-1541.
AbstractResonant x-ray reflectivity measurements from the surface of liquid Bi22In78 find only a modest surface Bi enhancement, with 35 at.% Bi in the first atomic layer. This is in contrast to the Gibbs adsorption in all liquid alloys studied to date, which show surface segregation of a complete monolayer of the low surface tension component. This suggests that surface adsorption in Bi-In is dominated by attractive interactions that increase the number of Bi-In neighbors at the surface. These are the first measurements in which resonant x-ray scattering has been used to quantify compositional changes induced at a liquid alloy surface.
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