Investigation of the oxide ion conduction mechanism in LaGaO 3-based electrolytes through high-temperature neutron powder diffraction

Masahiro Kajitani, Motohide Matsuda, Akinori Hoshikawa, Takashi Kamiyama, Fujio Izumi, Michihiro Miyake

Research output: Contribution to journalArticle

Abstract

The crystal structure and oxide ion conduction properties of La 0.9Sr0.1Ga0.9Mg0.1O2.9 were compared with those of LaGa0.8Mg0.2O2.9 with the same oxygen vacancy concentration. Although La0.9Sr 0.1Ga0.9Mg0.1O2.9 had a smaller free space through which oxide ions pass compared to LaGa0.8Mg 0.202.9, the activation energy of oxide ion conduction in the former was lower. This was attributed to the large displacement of La and Ga in La0.9Sr0.1Ga0.9Mg0.1O 2.9. The GaO6 octahedral tilts in the LaGaO3 perovskite structure were reduced by double doping with Sr and Mg. Reduction of the GaO6 octahedral tilt proved effective for oxide ion conduction.

Original languageEnglish
Pages (from-to)147-150
Number of pages4
JournalKey Engineering Materials
Volume350
DOIs
Publication statusPublished - 2007

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Neutron powder diffraction
Oxides
Electrolytes
Ions
Temperature
Oxygen vacancies
Perovskite
Activation energy
Crystal structure
Doping (additives)

Keywords

  • Lanthanum gallate
  • Neutron diffraction
  • Oxide ion conductor
  • Perovskite

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemical Engineering (miscellaneous)

Cite this

Investigation of the oxide ion conduction mechanism in LaGaO 3-based electrolytes through high-temperature neutron powder diffraction. / Kajitani, Masahiro; Matsuda, Motohide; Hoshikawa, Akinori; Kamiyama, Takashi; Izumi, Fujio; Miyake, Michihiro.

In: Key Engineering Materials, Vol. 350, 2007, p. 147-150.

Research output: Contribution to journalArticle

Kajitani, Masahiro ; Matsuda, Motohide ; Hoshikawa, Akinori ; Kamiyama, Takashi ; Izumi, Fujio ; Miyake, Michihiro. / Investigation of the oxide ion conduction mechanism in LaGaO 3-based electrolytes through high-temperature neutron powder diffraction. In: Key Engineering Materials. 2007 ; Vol. 350. pp. 147-150.
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AU - Kamiyama, Takashi

AU - Izumi, Fujio

AU - Miyake, Michihiro

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AB - The crystal structure and oxide ion conduction properties of La 0.9Sr0.1Ga0.9Mg0.1O2.9 were compared with those of LaGa0.8Mg0.2O2.9 with the same oxygen vacancy concentration. Although La0.9Sr 0.1Ga0.9Mg0.1O2.9 had a smaller free space through which oxide ions pass compared to LaGa0.8Mg 0.202.9, the activation energy of oxide ion conduction in the former was lower. This was attributed to the large displacement of La and Ga in La0.9Sr0.1Ga0.9Mg0.1O 2.9. The GaO6 octahedral tilts in the LaGaO3 perovskite structure were reduced by double doping with Sr and Mg. Reduction of the GaO6 octahedral tilt proved effective for oxide ion conduction.

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