Pairing interactions and gibbs adsorption at the liquid Bi-in surface: a resonant x-ray reflectivity study

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.

Subjects

Physics - Statistical Mechanics

Physics - Materials Science

DDC Class

530: Physik

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Pairing interactions and gibbs adsorption at the liquid Bi-in surface: a resonant x-ray reflectivity study