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

Research output: Contribution to journalArticle

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
Externally publishedYes

Fingerprint

gallates
Lanthanum
Neutron powder diffraction
lanthanum
Partial pressure
partial pressure
Crystal structure
Oxygen
Rietveld analysis
neutrons
crystal structure
expansion
Bond length
oxygen
diffraction
Lattice constants
lattice parameters
symmetry
Experiments

Keywords

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

ASJC Scopus subject areas

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

Cite this

Crystal structure of Fe-doped lanthanum gallate for oxygen partial pressures studied by neutron powder diffraction. / Mori, Kazuhiro; Kiyanagi, Ryoji; Richardson, James W.; Fieramosca, Joe; Onodera, Yohei; Itoh, Keiji; Sugiyama, Masaaki; Kamiyama, Takashi; Fukunaga, Toshiharu.

In: Solid State Ionics, Vol. 180, No. 6-8, 14.05.2009, p. 541-545.

Research output: Contribution to journalArticle

Mori, K, Kiyanagi, R, Richardson, JW, 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, vol. 180, no. 6-8, pp. 541-545. https://doi.org/10.1016/j.ssi.2008.07.001
Mori, Kazuhiro ; Kiyanagi, Ryoji ; Richardson, James W. ; Fieramosca, Joe ; Onodera, Yohei ; Itoh, Keiji ; Sugiyama, Masaaki ; Kamiyama, Takashi ; Fukunaga, Toshiharu. / Crystal structure of Fe-doped lanthanum gallate for oxygen partial pressures studied by neutron powder diffraction. In: Solid State Ionics. 2009 ; Vol. 180, No. 6-8. pp. 541-545.
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AU - Onodera, Yohei

AU - Itoh, Keiji

AU - Sugiyama, Masaaki

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AB - 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.

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KW - Neutron diffraction

KW - Perovskite structure

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