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  Crystallographic and electronic evolution of lanthanum strontium ferrite (La0.6Sr0.4FeO3−δ) thin film and bulk model systems during iron exsolution

Götsch, T., Köpfle, N., Grünbacher, M., Bernardi, J., Carbonio, E., Hävecker, M., et al. (2019). Crystallographic and electronic evolution of lanthanum strontium ferrite (La0.6Sr0.4FeO3−δ) thin film and bulk model systems during iron exsolution. Physical Chemistry Chemical Physics, 21(7), 3781-3794. doi:10.1039/C8CP07743F.

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 Creators:
Götsch, Thomas1, 2, 3, Author              
Köpfle, Norbert1, Author
Grünbacher, Matthias1, Author
Bernardi, Johannes4, Author
Carbonio, Emilia2, 5, Author              
Hävecker, Michael2, 3, Author              
Knop-Gericke, Axel2, 3, Author              
Bekheet, Maged F.6, Author
Schlicker, Lukas6, Author
Doran, Andrew7, Author
Gurlo, Aleksander6, Author
Franz, Alexandra8, Author
Klötzer, Bernhard1, Author
Penner, Simon1, Author
Affiliations:
1Department of Physical Chemistry, Universität Innsbruck, A-6020 Innsbruck, Austria, ou_persistent22              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
3Department of Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany, ou_persistent22              
4University Service Center for Transmission Electron Microscopy, TU Wien, A-1040 Vienna, Austria, ou_persistent22              
5Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin, Germany, ou_persistent22              
6Fachgebiet Keramische Werkstoffe, Chair of Advanced Ceramic Materials, Institut für Werkstoffwissenschaften und -technologien, Technische Universität Berlin, 10623 Berlin, Germany, ou_persistent22              
7Advanced Light Source, Lawrence Berkeley National Laboratory Berkeley, USA, ou_persistent22              
8Abteilung Struktur und Dynamik von Energiematerialien, Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany, ou_persistent22              

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 Abstract: We study the changes in the crystallographic phases and in the chemical states during the iron exsolution process of lanthanum strontium ferrite (LSF, La0.6Sr0.4FeO3−δ). By using thin films of orthorhombic LSF, grown epitaxially on NaCl(001) and rhombohedral LSF powder, the materials gap is bridged. The orthorhombic material transforms into a fluorite structure after the exsolution has begun, which further hinders this process. For the powder material, by a combination of in situ core level spectroscopy and ex situ neutron diffraction, we could directly highlight differences in the Fe chemical nature between surface and bulk: whereas the bulk contains Fe(IV) in the fully oxidized state, the surface spectra can be described perfectly by the sole presence of Fe(III). We also present corresponding magnetic and oxygen vacancy concentration data of reduced rhombohedral LSF that did not undergo a phase transformation to the cubic perovskite system based on neutron diffraction data.

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Language(s): eng - English
 Dates: 2018-12-192019-01-152019-01-152019-02-21
 Publication Status: Published in print
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1039/C8CP07743F
 Degree: -

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Project name : CLIPSOplus - Coordinated Access to Lightsources to Promote Standards and Optimization
Grant ID : 312284
Funding program : Funding Programme 7 (FP7)
Funding organization : European Commission (EC)

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Title: Physical Chemistry Chemical Physics
  Abbreviation : Phys. Chem. Chem. Phys.
Source Genre: Journal
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Publ. Info: Cambridge, England : Royal Society of Chemistry
Pages: 14 Volume / Issue: 21 (7) Sequence Number: - Start / End Page: 3781 - 3794 Identifier: ISSN: 1463-9076
CoNE: https://pure.mpg.de/cone/journals/resource/954925272413_1