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Oxidation of Fe(110) in oxygen gas at 400 degrees C

Soldemo, Markus; Lundgren, Edvin LU and Weissenrieder, Jonas (2016) In Surface Science 644. p.172-179
Abstract
The initial oxidation of Fe(110) in oxygen gas at 400 degrees C beyond initial adsorbate structures has been studied using X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, low-energy electron diffraction, and scanning tunneling microscopy (STM). Formation of several ordered phases of surface oxides is observed at oxygen coverages between approximately 2.3 and 3.5 oxygen atoms/Fe(110) surface atom. Initially, a FeO(111)-like film is formed with a parallelogram-shaped moire pattern. It has two mirror domains that are formed symmetrically around the growth direction of a zigzag-shaped adsorbate structure. With increased local oxygen coverage, the moire structure transforms into a ball-shaped form. Both these moire structures... (More)
The initial oxidation of Fe(110) in oxygen gas at 400 degrees C beyond initial adsorbate structures has been studied using X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, low-energy electron diffraction, and scanning tunneling microscopy (STM). Formation of several ordered phases of surface oxides is observed at oxygen coverages between approximately 2.3 and 3.5 oxygen atoms/Fe(110) surface atom. Initially, a FeO(111)-like film is formed with a parallelogram-shaped moire pattern. It has two mirror domains that are formed symmetrically around the growth direction of a zigzag-shaped adsorbate structure. With increased local oxygen coverage, the moire structure transforms into a ball-shaped form. Both these moire structures have equal atomic stacking at the surface and equal apparent height in STM, suggesting oxygen ions diffusing into the film upon oxidation and that the oxide growth takes place at the iron-iron oxide interface. The FeO(111)-like film turns into a Fe3O4(111)-like film with a triangular bistable surface termination as the oxidation proceeds further. The FeO(111)-like film growth proceeds according to the Frank-van der Merwe mechanism while the Fe3O4(111)-like film grows according to the Stranski-Krastanov mechanism. (C) 2015 Elsevier B.V. All rights reserved. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
keywords
Iron oxide thin film, Fe(110), Scanning tunneling microscopy, Low-energy, electron diffraction, Photoelectron spectroscopy
in
Surface Science
volume
644
pages
172 - 179
publisher
Elsevier
external identifiers
  • wos:000367489000027
  • scopus:84949494103
ISSN
0039-6028
DOI
10.1016/j.susc.2015.10.058
language
English
LU publication?
yes
id
fb26ad69-9700-48f6-8cb7-216ec6a59e96 (old id 8754618)
date added to LUP
2016-02-23 07:31:44
date last changed
2017-07-23 04:10:36
@article{fb26ad69-9700-48f6-8cb7-216ec6a59e96,
  abstract     = {The initial oxidation of Fe(110) in oxygen gas at 400 degrees C beyond initial adsorbate structures has been studied using X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, low-energy electron diffraction, and scanning tunneling microscopy (STM). Formation of several ordered phases of surface oxides is observed at oxygen coverages between approximately 2.3 and 3.5 oxygen atoms/Fe(110) surface atom. Initially, a FeO(111)-like film is formed with a parallelogram-shaped moire pattern. It has two mirror domains that are formed symmetrically around the growth direction of a zigzag-shaped adsorbate structure. With increased local oxygen coverage, the moire structure transforms into a ball-shaped form. Both these moire structures have equal atomic stacking at the surface and equal apparent height in STM, suggesting oxygen ions diffusing into the film upon oxidation and that the oxide growth takes place at the iron-iron oxide interface. The FeO(111)-like film turns into a Fe3O4(111)-like film with a triangular bistable surface termination as the oxidation proceeds further. The FeO(111)-like film growth proceeds according to the Frank-van der Merwe mechanism while the Fe3O4(111)-like film grows according to the Stranski-Krastanov mechanism. (C) 2015 Elsevier B.V. All rights reserved.},
  author       = {Soldemo, Markus and Lundgren, Edvin and Weissenrieder, Jonas},
  issn         = {0039-6028},
  keyword      = {Iron oxide thin film,Fe(110),Scanning tunneling microscopy,Low-energy,electron diffraction,Photoelectron spectroscopy},
  language     = {eng},
  pages        = {172--179},
  publisher    = {Elsevier},
  series       = {Surface Science},
  title        = {Oxidation of Fe(110) in oxygen gas at 400 degrees C},
  url          = {http://dx.doi.org/10.1016/j.susc.2015.10.058},
  volume       = {644},
  year         = {2016},
}