Growth of FeO[sub [ital x]] on Pt(111) studied by scanning tunneling microscopy
- Materials Sciences Division, Lawrence Berkeley Laboratory and Department of Physics, University of California, Berkeley, California 94720 (United States)
- Materials Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States)
We have studied the growth of iron oxide films on Pt(111) using scanning tunneling microscopy. The system has been found to depend sensitively on the temperature and oxygen pressure used to form the oxide. As the coverage is varied from below a monolayer to multilayers of approximately four or five layers thick, three different ordered structures are observed as well as regimes in which the iron oxide appears disordered. For coverages [le]1 ML, the iron oxide is FeO and a large lattice mismatch between the iron oxide and platinum governs the growth process. The first ordered structure occurs at a monolayer coverage and has a large unit cell where [similar to]8 lattice spacings of the FeO fit [similar to]9 of the Pt(111) surface. At higher coverages, [radical]3[times][radical]3[ital R]30[degree] and 2[times]2 [W. Weiss, A. Barbieri, M. A. Van Hove, and G. A. Somorjai, Phys. Rev. Lett. [bold 71], 1884 (1993)] ordered structures are observed. These can be ascribed to [alpha]-Fe[sub 2]O[sub 3] and Fe[sub 3]O[sub 4] phases respectively which are the equilibrium phases for the oxygen pressures and temperatures used in growing the iron oxide. A disordered multilayer growth is also observed.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 7175108
- Journal Information:
- Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States) Vol. 12:4; ISSN 0734-2101; ISSN JVTAD6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
CHALCOGENIDES
ELEMENTS
GROWTH
IRON COMPOUNDS
IRON OXIDES
LAYERS
METALS
MICROSCOPY
ORDER-DISORDER TRANSFORMATIONS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHASE TRANSFORMATIONS
PLATINUM
PLATINUM METALS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS