Thermodynamic stability and atomic and electronic structure of reduced Fe{sub 3}O{sub 4} (111) single-crystal surfaces
- Experimentelle Physik IV, Universitaet Wuerzburg, D-97074 Wuerzburg (Germany)
Magnetite (111) single-crystal surfaces prepared in situ under different reducing conditions and--as a result--with varying stoichiometries have been studied by scanning tunneling microscopy, low-energy electron diffraction, and x-ray photoemission spectroscopy. The coexistence of several surface structures has been detected, indicating only small differences in their relative stabilities. In particular, an unusual previously unreported superstructure has been found for a strongly reduced surface. Its microscopic origin is discussed against the background of recent results from scanning tunneling microscopy of the oxidized magnetite (111) surface and from ab initio thermodynamics. Partly at variance with and partly complementary to these results, we regard as driving force elastic strain due to the lateral mismatch between Fe{sub 3}O{sub 4} substrate and Fe{sub 1-x}O-like overlayer.
- OSTI ID:
- 21055132
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 76, Issue 7; Other Information: DOI: 10.1103/PhysRevB.76.075412; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL STRUCTURE
ELECTRON DIFFRACTION
ELECTRONIC STRUCTURE
FERRITES
FERROMAGNETIC MATERIALS
IRON OXIDES
LAYERS
MAGNETISM
MAGNETITE
MONOCRYSTALS
PHOTOEMISSION
SCANNING TUNNELING MICROSCOPY
STABILITY
STOICHIOMETRY
SUBSTRATES
SURFACES
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
X RADIATION
X-RAY PHOTOELECTRON SPECTROSCOPY