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V2O3(0001) surface terminations: from oxygen- to vanadium-rich

Schoiswohl, J; Sock, M; Surnev, S; Ramsey, MG; Netzer, FP; Kresse, G and Andersen, Jesper N LU (2004) In Surface Science 555(1-3). p.101-117
Abstract
Well-ordered epitaxial V2O3(0 0 0 1) films (thickness > 80 Angstrom) have been prepared on the clean Rh(1 1 1) surface and investigated with scanning tunnelling microscopy, low-energy electron diffraction, high-resolution electron energy loss spectroscopy and high-resolution X-ray photoelectron spectroscopy with synchrotron radiation. Atomically flat V2O3(0 0 0 1) surfaces, terminated by vanadyl (V=O) groups, have been obtained after the reactive oxide deposition and subsequent annealing in vacuum to 600 degreesC. Annealing the V=O termination in oxygen atmosphere (500 degreesC, 5 x 10(-6) mbar) results in the partial removal of the vanadyl groups and in the formation of an oxygen-richer surface termination, exhibiting a (root3 x... (More)
Well-ordered epitaxial V2O3(0 0 0 1) films (thickness > 80 Angstrom) have been prepared on the clean Rh(1 1 1) surface and investigated with scanning tunnelling microscopy, low-energy electron diffraction, high-resolution electron energy loss spectroscopy and high-resolution X-ray photoelectron spectroscopy with synchrotron radiation. Atomically flat V2O3(0 0 0 1) surfaces, terminated by vanadyl (V=O) groups, have been obtained after the reactive oxide deposition and subsequent annealing in vacuum to 600 degreesC. Annealing the V=O termination in oxygen atmosphere (500 degreesC, 5 x 10(-6) mbar) results in the partial removal of the vanadyl groups and in the formation of an oxygen-richer surface termination, exhibiting a (root3 x root3)R30degrees structure. Structure models for this oxygen-rich termination are proposed, which are characterised by (O=V)(0.66)-O-3-V-V-. . . and (O=V)(0.33)-O-3-V-V (. . .) stacking sequences. Conversely, deposition of sub-monolayer V coverages onto the V=O surface leads to the formation of a metal-rich V2O3(0 0 0 1) surface, terminated by a close-packed V-3 layer on top of the bulk-type O-3 plane. Such a VO(1 1 1)-layer is only metastable and oxidises back readily upon annealing in vacuum to the vanadyl-terminated V2O3(0 0 0 1) surface. (C) 2004 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
spectroscopy, X-ray photoelectron, vanadium oxide, scanning tunneling microscopy, electron energy loss spectroscopy (EELS)
in
Surface Science
volume
555
issue
1-3
pages
101 - 117
publisher
Elsevier
external identifiers
  • wos:000220932600013
  • scopus:1842527485
ISSN
0039-6028
DOI
10.1016/j.susc.2003.12.053
language
English
LU publication?
yes
id
31f6a28c-4f1e-4dc7-9a7b-68afad1ba788 (old id 280592)
date added to LUP
2007-10-31 13:16:03
date last changed
2017-08-20 04:31:07
@article{31f6a28c-4f1e-4dc7-9a7b-68afad1ba788,
  abstract     = {Well-ordered epitaxial V2O3(0 0 0 1) films (thickness > 80 Angstrom) have been prepared on the clean Rh(1 1 1) surface and investigated with scanning tunnelling microscopy, low-energy electron diffraction, high-resolution electron energy loss spectroscopy and high-resolution X-ray photoelectron spectroscopy with synchrotron radiation. Atomically flat V2O3(0 0 0 1) surfaces, terminated by vanadyl (V=O) groups, have been obtained after the reactive oxide deposition and subsequent annealing in vacuum to 600 degreesC. Annealing the V=O termination in oxygen atmosphere (500 degreesC, 5 x 10(-6) mbar) results in the partial removal of the vanadyl groups and in the formation of an oxygen-richer surface termination, exhibiting a (root3 x root3)R30degrees structure. Structure models for this oxygen-rich termination are proposed, which are characterised by (O=V)(0.66)-O-3-V-V-. . . and (O=V)(0.33)-O-3-V-V (. . .) stacking sequences. Conversely, deposition of sub-monolayer V coverages onto the V=O surface leads to the formation of a metal-rich V2O3(0 0 0 1) surface, terminated by a close-packed V-3 layer on top of the bulk-type O-3 plane. Such a VO(1 1 1)-layer is only metastable and oxidises back readily upon annealing in vacuum to the vanadyl-terminated V2O3(0 0 0 1) surface. (C) 2004 Elsevier B.V. All rights reserved.},
  author       = {Schoiswohl, J and Sock, M and Surnev, S and Ramsey, MG and Netzer, FP and Kresse, G and Andersen, Jesper N},
  issn         = {0039-6028},
  keyword      = {spectroscopy,X-ray photoelectron,vanadium oxide,scanning tunneling microscopy,electron energy loss spectroscopy (EELS)},
  language     = {eng},
  number       = {1-3},
  pages        = {101--117},
  publisher    = {Elsevier},
  series       = {Surface Science},
  title        = {V2O3(0001) surface terminations: from oxygen- to vanadium-rich},
  url          = {http://dx.doi.org/10.1016/j.susc.2003.12.053},
  volume       = {555},
  year         = {2004},
}