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

doi:10.4028/0-87849-449-9.147

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

Graduate School of Environmental and Life Science

Research output: Contribution to journal › Article › peer-review

Abstract

The crystal structure and oxide ion conduction properties of La _0.9Sr_0.1Ga_0.9Mg_0.1O_2.9 were compared with those of LaGa_0.8Mg_0.2O_2.9 with the same oxygen vacancy concentration. Although La_0.9Sr _0.1Ga_0.9Mg_0.1O_2.9 had a smaller free space through which oxide ions pass compared to LaGa_0.8Mg _0.20_2.9, the activation energy of oxide ion conduction in the former was lower. This was attributed to the large displacement of La and Ga in La_0.9Sr_0.1Ga_0.9Mg_0.1O _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 language	English
Pages (from-to)	147-150
Number of pages	4
Journal	Key Engineering Materials
Volume	350
DOIs	https://doi.org/10.4028/0-87849-449-9.147
Publication status	Published - Jan 1 2007

Keywords

Lanthanum gallate
Neutron diffraction
Oxide ion conductor
Perovskite

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

Access to Document

10.4028/0-87849-449-9.147

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, 01.01.2007, p. 147-150.

Research output: Contribution to journal › Article › peer-review

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

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.",

keywords = "Lanthanum gallate, Neutron diffraction, Oxide ion conductor, Perovskite",

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AU - Kajitani, Masahiro

AU - Matsuda, Motohide

AU - Hoshikawa, Akinori

AU - Kamiyama, Takashi

AU - Izumi, Fujio

AU - Miyake, Michihiro

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N2 - 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.

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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KW - Neutron diffraction

KW - Oxide ion conductor

KW - Perovskite

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