Low-energy Auger and autoionization emissions of clean and O2-exposed FeTi and Fe2Ti4O

P. H. McBreen, M. Polak

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Three distinct features in the low-energy Auger spectrum of the intermetallics FeTi and Fe2Ti4O, namely the Ti(M23VV) transition, a transition involving titanium-oxygen bonding electrons, Ti(M23V)TiO(V), and gain satellites recently identified as being due to autoionization emission, were found to furnish detailed information concerning chemical bonding at the surface of clean and oxygen exposed samples. Marked changes in these spectral features upon O2 exposure indicate selective interaction of oxygen with the Ti atoms from the early stages of adsorption. The spectral changes at low oxygen exposure are discussed in terms of the population of interstitial oxygen sites to a critical local concentration, and the subsequent nucleation and growth of a stoichiometric surface oxide. At ∼ 40 L O2 exposure apparent saturation is reached with a TiO2 overlayer formed on both of the compounds at 300 K. Subtle differences between the autoionization emission feature in pure and in alloyed Fe are noted and discussed.

Original languageEnglish
Pages (from-to)L666-L674
JournalSurface Science
Volume163
Issue number1
DOIs
StatePublished - 1 Nov 1985

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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