The Fe3O4 origin of the "Biphase" reconstruction on α-Fe2O3(0 0 0 1)

Courtney H. Lanier, Ann N. Chiaramonti, Laurence D. Marks, Kenneth R. Poeppelmeier

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The so-called Biphase termination on α-Fe2O3 has been widely accepted to be a structure with a ∼40 Å unit supercell composed of coexisting islands of Fe1-xO and α-Fe2O3. Based on thermodynamic arguments and experimental evidence, including transmission electron diffraction, imaging, magnetic and spectroscopic information, it is found that the previously proposed structure model is inaccurate. The actual Biphase structure is instead a layered structure related to the reduction of α-Fe2O3 to Fe3O4. A model for the Biphase termination is proposed which does not contain islands of Fe1-xO but instead consists of bulk α-Fe2O3 and a Fe3O4-derived overlayer. The proposed model is consistent with all current and previously reported experimental findings.

Original languageEnglish
Pages (from-to)2574-2579
Number of pages6
JournalSurface Science
Volume603
Issue number16
DOIs
Publication statusPublished - Aug 15 2009

Keywords

  • Electron microscopy
  • Iron oxide
  • Surface structure

ASJC Scopus subject areas

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

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