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Correlation of O (1s) and Fe (2p) near edge x-ray absorption fine structure spectra and electrical conductivity of La1−xSrxFe0.75Ni0.25O3−delta

Appl. Phys. Lett. 95, 174108 (2009); doi:10.1063/1.3246145

Published 30 October 2009

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Selma Erat,1,2 Artur Braun,1 Alejandro Ovalle,1 Cinthia Piamonteze,3 Zhi Liu,4 Thomas Graule,1,5 and Ludwig J. Gauckler2
1Laboratory for High Performance Ceramics, EMPA–Swiss Federal Laboratories for Materials Testing and Research, CH-8600 Dübendorf, Switzerland
2Department of Materials, Nonmetallic Inorganic Materials, ETH Zurich–Swiss Federal Institute of Technology, CH-8093 Zurich, Switzerland
3Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
4Advanced Light Source, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
5Technische Universität Bergakademie Freiberg, D-09596 Freiberg, Germany
A-site substitution of La3+ by Sr2+ in polaron conducting ABO3-type perovskite La1−xSrxFe0.75Ni0.25O3−delta causes oxidation of Fe3+ toward Fe4+ and formation of conducting electron holes, as evidenced by Fe (2p) and O (1s) near edge x-ray absorption fine structure spectra. Hole doping is reflected by linear variation of the prepeak ratio eg([up-arrow])/[t2g([down-arrow])+eg([down-arrow])] of oxygen spectra, along with increased conductivity. The significant increase in conductivity due to NiO doping in La1−xSrxFeO3−delta is caused by increased overlap between Fe (3d) and O (2p) and charge transfer from the O (2p) to the Ni (3d) states, as concluded from near edge x-ray absorption fine structure spectra and ligand field multiplet calculations. ©2009 American Institute of Physics
History: Received 7 August 2009; accepted 18 September 2009; published 30 October 2009
Permalink: http://link.aip.org/link/?APPLAB/95/174108/1
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KEYWORDS and PACS

Keywords
PACS
  • 78.70.Dm
    X-ray absorption spectra (condensed matter)
  • 61.72.up
    Doping and impurity implantation in other materials
  • 72.80.Sk
    Electrical conductivity of insulators
  • 71.38.-k
    Polarons and electron-phonon interactions
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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