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Atomic-scale surface demixing in a eutectic liquid BiSn alloy.

Oleg G Shpyrko1, Alexei Yu Grigoriev, Reinhard Streitel

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA. oleg@xray.harvard.edu

Physical Review Letters
|October 4, 2005
PubMed
Summary
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Resonant x-ray reflectivity revealed atomic-scale demixing in liquid bismuth-tin (Bi-Sn) alloy surfaces. This indicates strong attractive Bi-Sn interactions dominate surface behavior over entropy in the near-surface layers.

Area of Science:

  • Materials Science
  • Surface Science
  • Physical Chemistry

Background:

  • Adsorption studies in liquid alloys offer unique insights into surface interatomic interactions due to the absence of a fixed atomic lattice.
  • Understanding surface composition is crucial for predicting alloy behavior and properties.

Purpose of the Study:

  • To investigate the near-surface atomic structure and composition of the Bi(43)Sn(57) eutectic alloy in its liquid phase.
  • To explore the nature of interatomic interactions at the surface of liquid alloys.

Main Methods:

  • Utilizing resonant x-ray reflectivity to probe the surface structure with atomic resolution.
  • Applying multilayer extensions of the Gibbs adsorption model (Defay-Prigogine and Strohl-King) for quantitative analysis.

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Main Results:

  • Atomic-scale demixing was observed, extending over three near-surface atomic layers in the liquid Bi-Sn alloy.
  • The composition modulation was quantitatively explained by multilayer adsorption models.
  • Attractive Bi-Sn interactions were found to dominate over entropic effects at the near-surface region.

Conclusions:

  • Liquid alloy surfaces exhibit complex compositional variations beyond simple surface tension effects.
  • The study demonstrates the applicability of multilayer adsorption models to liquid systems.
  • Strong specific interactions between bismuth and tin atoms significantly influence the surface structure of their eutectic alloy.