Morphological and structural investigation of the early stages of epitaxial growth of α-Fe2O3 (0001) on α-Al2O3 (0001) by oxygen-plasma-assisted MBE

S. I. Yi, Y. Liang, S. Thevuthasan, S. A. Chambers

Research output: Contribution to journalArticle

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Abstract

We have investigated the early stages of α-Fe2O3 (0001) film growth on α-Al2O3 (0001) using oxygen-plasma-enhanced molecular beam epitaxy along with reflection high-energy electron diffraction, non-contact atomic force microscopy, and X-ray photoelectron spectroscopy and diffraction. A compressionally strained, fully stoichiometric α-Fe2O3 film three monolayers thick forms prior to the onset of three-dimensional island formation and lattice relaxation. The surface of this film appears to buckle along 〈112̄0〉, giving rise to a new set of inwardly contracted diffraction spots, which, if not resolved from the substrate spots, could be interpreted as a 12% in-plane lattice parameter expansion. Such an interpretation has led prior investigators to conclude that the interfacial layer consists of a disordered cation layer with an in-plane lattice parameter approximately 6% larger than that of α-Fe2O3. Our interpretation of the diffraction data suggests that the interfacial layer is badly distorted but commensurate with the substrate.

Original languageEnglish
Pages (from-to)212-220
Number of pages9
JournalSurface Science
Volume443
Issue number3
DOIs
Publication statusPublished - 20 Dec 1999
Externally publishedYes

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oxygen plasma
Epitaxial growth
Molecular beam epitaxy
Diffraction
Oxygen
Plasmas
Lattice constants
lattice parameters
diffraction
Reflection high energy electron diffraction
Film growth
Substrates
high energy electrons
Cations
Monolayers
Atomic force microscopy
molecular beam epitaxy
X ray photoelectron spectroscopy
electron diffraction
Positive ions

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Morphological and structural investigation of the early stages of epitaxial growth of α-Fe2O3 (0001) on α-Al2O3 (0001) by oxygen-plasma-assisted MBE. / Yi, S. I.; Liang, Y.; Thevuthasan, S.; Chambers, S. A.

In: Surface Science, Vol. 443, No. 3, 20.12.1999, p. 212-220.

Research output: Contribution to journalArticle

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