Lead segregation at clean and oxygen-covered surfaces of Al-0.01%Pb solid solution

S. Aloni, M. Polak

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20 Scopus citations

Abstract

The surface composition of A1-0.01at%Pb solid solution was studied between 300 and 700 K using low-energy Auger electron spectroscopy. Lead segregates strongly at the clean surfaces of this alloy (Xs = 0.55 at equilibrium), while above ∼ 550 K evaporation effects become dominant. Pre-adsorbed oxygen retards the segregation, but eventually, being more surface-active on A1, Pb atoms displace a large fraction of the surface oxygen. Thermodynamic aspects of the observed phenomena are discussed.

Original languageEnglish
Pages (from-to)L123-L127
JournalSurface Science
Volume349
Issue number1
DOIs
StatePublished - 20 Mar 1996

Keywords

  • Aluminum
  • Auger electron spectroscopy
  • Equilibrium thermodynamics and statistical mechanics
  • Lead
  • Solid-gas interfaces
  • Surface segregation

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