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Extracting the near surface stoichiometry of BiFe0.5Mn0.5O3 thin films; a finite element maximum entropy approach

Song, F.; Monsen, A.; Li, Z. S.; Choi, E. -M.; MacManus-Driscoll, J. L.; Xiong, J.; Jia, Q. X.; Wahlstrom, E. and Wells, Justin LU (2012) In Surface Science 606(23-24). p.1771-1776
Abstract
The surface and near-surface chemical composition of BiFe0.5Mn0.5O3 has been studied using a combination of low photon energy synchrotron photoemission spectroscopy, and a newly developed maximum entropy finite element model from which it is possible to extract the depth dependent chemical composition. In the uppermost few unit cells, an overabundance of Bi, and a deficiency of Fe and Mn are observed. In deeper layers, the measurements are consistent with bulk-like stoichiometry. Additionally, a definitive identification of all the observed species together with their abundance and depth dependence is given, and the mixed Fe and Mn valencies are estimated. In addition to the expected bulk valencies Mn3+ and Fe3+, some Fe2+ and a small... (More)
The surface and near-surface chemical composition of BiFe0.5Mn0.5O3 has been studied using a combination of low photon energy synchrotron photoemission spectroscopy, and a newly developed maximum entropy finite element model from which it is possible to extract the depth dependent chemical composition. In the uppermost few unit cells, an overabundance of Bi, and a deficiency of Fe and Mn are observed. In deeper layers, the measurements are consistent with bulk-like stoichiometry. Additionally, a definitive identification of all the observed species together with their abundance and depth dependence is given, and the mixed Fe and Mn valencies are estimated. In addition to the expected bulk valencies Mn3+ and Fe3+, some Fe2+ and a small amount of Mn4+ are also observed. The maximum entropy finite element model demonstrated here is also discussed in more general terms and its potential application to the broader field of perovskite thin films is made apparent. (C) 2012 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
BFMO, Perovskites, Metal oxide: synchrotron photoemission, XPS, Maximum, entropy, Depth profiling
in
Surface Science
volume
606
issue
23-24
pages
1771 - 1776
publisher
Elsevier
external identifiers
  • wos:000309318100004
  • scopus:84866406865
ISSN
0039-6028
DOI
10.1016/j.susc.2012.06.016
language
English
LU publication?
yes
id
637b5aaa-af8b-45a8-a663-a41849d059fd (old id 3184430)
date added to LUP
2012-12-06 14:16:34
date last changed
2017-01-01 06:15:12
@article{637b5aaa-af8b-45a8-a663-a41849d059fd,
  abstract     = {The surface and near-surface chemical composition of BiFe0.5Mn0.5O3 has been studied using a combination of low photon energy synchrotron photoemission spectroscopy, and a newly developed maximum entropy finite element model from which it is possible to extract the depth dependent chemical composition. In the uppermost few unit cells, an overabundance of Bi, and a deficiency of Fe and Mn are observed. In deeper layers, the measurements are consistent with bulk-like stoichiometry. Additionally, a definitive identification of all the observed species together with their abundance and depth dependence is given, and the mixed Fe and Mn valencies are estimated. In addition to the expected bulk valencies Mn3+ and Fe3+, some Fe2+ and a small amount of Mn4+ are also observed. The maximum entropy finite element model demonstrated here is also discussed in more general terms and its potential application to the broader field of perovskite thin films is made apparent. (C) 2012 Elsevier B.V. All rights reserved.},
  author       = {Song, F. and Monsen, A. and Li, Z. S. and Choi, E. -M. and MacManus-Driscoll, J. L. and Xiong, J. and Jia, Q. X. and Wahlstrom, E. and Wells, Justin},
  issn         = {0039-6028},
  keyword      = {BFMO,Perovskites,Metal oxide: synchrotron photoemission,XPS,Maximum,entropy,Depth profiling},
  language     = {eng},
  number       = {23-24},
  pages        = {1771--1776},
  publisher    = {Elsevier},
  series       = {Surface Science},
  title        = {Extracting the near surface stoichiometry of BiFe0.5Mn0.5O3 thin films; a finite element maximum entropy approach},
  url          = {http://dx.doi.org/10.1016/j.susc.2012.06.016},
  volume       = {606},
  year         = {2012},
}