Oxygen Pressure Dependence of the α-Fe2O3(0001) Surface Structure Full article
Journal |
Surface Science
ISSN: 0039-6028 |
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Output data | Year: 1999, Volume: 432, Number: 3, Pages: L627-L634 Pages count : 8 DOI: 10.1016/S0039-6028(99)00643-3 | ||||
Tags | Epitaxial films; Iron oxide; Low energy electron diffraction (LEED); Scanning tunneling microscopy; Surface structure; Surface thermodynamics | ||||
Authors |
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Affiliations |
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Funding (1)
1 | Max Planck Society |
Abstract:
The dependence of the α-Fe2O3(0001) hematite surface structure on ambient oxygen gas pressure was investigated with scanning tunneling microscopy and low energy electron diffraction. For this, thin epitaxial α-Fe2O3(0001) films grown onto a Pt(111) substrate were prepared in oxygen partial pressures between 10−6 and 1 mbar at temperatures around 830°C. In high pressures of 1 mbar an oxygen-terminated surface structure covers almost the whole sample surface. At pressures between 10−4 and 10−1 mbar comparable amounts of oxygen and iron-terminated surface areas coexist in neighboring domains. The lateral size of these domains decreases from values of 200–900 Å for pressures between 10−3 and 10−1 mbar to values around 30 Å at 10−4 mbar. At 10−5 mbar the oxygen-terminated surface areas completely vanish and an iron-terminated α-Fe2O3(0001) surface structure is formed, which is partly covered by disordered patches with lateral sizes of 10–20 Å. Further decreasing the oxygen pressure to 10−6 mbar results in a partial reduction of the surface region and the formation of coexisting α-Fe2O3(0001) and FeO1−x(111) domains that are arranged in an ordered manner forming a superstructure known as ‘biphase structure’.
Cite:
Shaikhutdinov S.K.
, Weiss W.
Oxygen Pressure Dependence of the α-Fe2O3(0001) Surface Structure
Surface Science. 1999. V.432. N3. P.L627-L634. DOI: 10.1016/S0039-6028(99)00643-3 WOS Scopus РИНЦ
Oxygen Pressure Dependence of the α-Fe2O3(0001) Surface Structure
Surface Science. 1999. V.432. N3. P.L627-L634. DOI: 10.1016/S0039-6028(99)00643-3 WOS Scopus РИНЦ
Dates:
Submitted: | Feb 2, 1999 |
Accepted: | Apr 19, 1999 |
Published online: | Jul 16, 1999 |
Published print: | Jul 20, 1999 |
Identifiers:
Web of science | WOS:000081685700007 |
Scopus | 2-s2.0-0032668364 |
Elibrary | 13308101 |
Chemical Abstracts | 1999:548227 |
Chemical Abstracts (print) | 131:219545 |
OpenAlex | W2089464524 |