Epitaxial growth of ultrathin films of chromium and its oxides on Pt(111)
- Department of Physics, Tulane University, New Orleans, Louisiana 70118 (United States)
The growth of vapor-deposited Cr and chromium oxide on Pt(111) has been studied by ion scattering spectroscopy, x-ray photoelectron spectroscopy, low energy electron diffraction, and scanning tunneling microscopy. Both metal Cr film and its oxide nucleate at Pt(111) step edges, and grow in a step-flow mode. The metal Cr film is pseudomorphic to the Pt(111) substrate within the first two monolayers. At higher coverages, the chromium overlayer adopts a bcc(110) surface structure and forms three-dimensional elongated islands oriented along the three close-packed directions of the Pt(111) surface. For the chromium oxide, a well ordered p(2{times}2) structure is observed within the first two monolayers and attributed to the epitaxial growth of metastable Cr{sub 3}O{sub 4}. At higher coverages, a ({radical}3{times}{radical}3)R30{degree} structure appears, due to the formation of the stable Cr{sub 2}O{sub 3} phase. {copyright} {ital 1997 American Vacuum Society.}
- OSTI ID:
- 509008
- Report Number(s):
- CONF-961002-; ISSN 0734-2101; TRN: 9711M0118
- Journal Information:
- Journal of Vacuum Science and Technology, A, Vol. 15, Issue 3; Conference: 43. national symposium of the American Vacuum Society (AVS), Philadelphia, PA (United States), 14-18 Oct 1996; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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