X-ray scattering study of the stoichiometric recovery of the α-Fe2O3(0001) surface

C. Y. Kim, A. A. Escuadro, M. J. Bedzyk, L. Liu, P. C. Stair

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The stoichiometric recovery and accompanying changes of subsurface atomic structure of Ar ion sputtered, oxygen deficient α-Fe2O 3(0001) are studied with X-ray scattering. Although oxygen annealing up to 735°C results in a stoichiometric top surface layer manifested as a (1 × 1) surface structure, the X-ray scattering reveals the existence of a non-stoichiometric phase in the subsurface region. The non-stoichiometric region is characterized as a remnant of Fe3O4 or γ-Fe 2O3. The stoichiometric outmost surface layers act as a barrier for propagation of oxidation to underneath remnant phase. The remnant phase can be removed after annealing at a higher temperature.

Original languageEnglish
Pages (from-to)239-246
Number of pages8
JournalSurface Science
Volume572
Issue number2-3
DOIs
Publication statusPublished - Nov 20 2004

Keywords

  • Iron oxide
  • Oxidation
  • Sputtering
  • Surface structure, morphology, roughness, and topography
  • X-ray scattering, diffraction, and reflection

ASJC Scopus subject areas

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

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