Crystal structure of Fe-doped lanthanum gallate for oxygen partial pressures studied by neutron powder diffraction

Kazuhiro Mori, Ryoji Kiyanagi, James W. Richardson, Joe Fieramosca, Yohei Onodera, Keiji Itoh, Masaaki Sugiyama, Takashi Kamiyama, Toshiharu Fukunaga

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Abstract

Neutron powder diffraction experiments were carried out to investigate a change in a crystal structure of La0.8Sr0.2Ga0.65Fe0.35O3 for oxygen partial pressures, PO2, at 800 °C. The crystal structure was refined on the basis of the R3̄c symmetry for the PO2 range from 10- 1 to 10- 20 atm, by the Rietveld analysis. It was found that lattice parameters, a and c, monotonically expand with decreasing PO2, and then both expansions are rapidly suppressed below 10- 4 atm. In the meantime, lM-O and lO-O(2) also discontinuously increased with decreasing PO2, while lO-O(1) did not change at all PO2, where lM-O, lO-O(1) and lO-O(2) are the bond lengths within a MO6 octahedron (M = Ga0.65Fe0.35). This result indicates that the lM-O and the lO-O(2) are more important than the lO-O(1) for such a complicated lattice expansion for PO2.

Original languageEnglish
Pages (from-to)541-545
Number of pages5
JournalSolid State Ionics
Volume180
Issue number6-8
DOIs
Publication statusPublished - May 14 2009

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Keywords

  • Fe-doping
  • LaGaO
  • Mixed conductor
  • Neutron diffraction
  • Perovskite structure

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Mori, K., Kiyanagi, R., Richardson, J. W., Fieramosca, J., Onodera, Y., Itoh, K., Sugiyama, M., Kamiyama, T., & Fukunaga, T. (2009). Crystal structure of Fe-doped lanthanum gallate for oxygen partial pressures studied by neutron powder diffraction. Solid State Ionics, 180(6-8), 541-545. https://doi.org/10.1016/j.ssi.2008.07.001