Pairing Interactions and Gibbs Adsorption at the Liquid Bi-In Surface: A Resonant X-Ray Reflectivity Study

Abstract

Resonant x-ray reflectivity measurements from the surface of liquid Bi22In78 find only a modest surface Bi enhancement, with 35 atomic % 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.

11 pages, 2 figures, 2 tables, published in Phys. Rev. Lett

References in corpus (3)

• Surface Structure of Liquid Metals and the Effect of Capillary Waves: X-ray Studies on Liquid Indium
• Wetting Phase Transition at the Surface of Liquid Ga-Bi alloys: An X-ray Reflectivity Study
• Surface Induced Order in Liquid Metals and Binary Alloys

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• Ab initio study of the atomic motion in liquid metal surfaces: comparison with Lennard-Jones systems
• Spatial modulation of the composition of a binary liquid near a repulsive wall