Oxide ion conductivity in La(Sr)Ga(Fe,Mg)O3 and its application for solid oxide fuel cells

Tatsumi Ishihara; Masaki Ando; Makiko Enoki; Yusaku Takita

doi:10.1016/j.jallcom.2004.12.086

Oxide ion conductivity in La(Sr)Ga(Fe,Mg)O₃ and its application for solid oxide fuel cells

Tatsumi Ishihara, Masaki Ando, Makiko Enoki, Yusaku Takita

Materials Science and Engineering, School of Engineering

Research output: Contribution to journal › Conference article

17 Citations (Scopus)

Abstract

Oxide ion conductivity in La(Sr)Ga(Fe,Mg)O₃ was investigated in this study and it was found that the oxide ion conductivity increased significantly by doping Fe into Ga site. Although the electrical conductivity monotonically increased with increasing amount of Fe, partial electronic conduction became significant. On the other hand, doping Mg for Ga site simultaneously with Fe is useful for keeping high transport number. By doping Fe for Ga site, perovskite oxide with cubic structure seems to be stabilized and the solid solution limit for Sr for La site is expanded. Considering the transport number of oxide ion and the electronic conductivity, the optimum composition for oxide ion conductivity in this system is La_0.7Sr _0.3Ga_0.7Fe_0.2Mg_0.1O₃ _- _δ (LSGFM73721). By using this oxide for electrolyte, large power density of 200 mW/cm² can be achieved at 873 K.

Original language	English
Pages (from-to)	507-511
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	408-412
DOIs	https://doi.org/10.1016/j.jallcom.2004.12.086
Publication status	Published - Feb 9 2006
Event	Proceedings of the Rare Earths'04 in Nara, Japan - Duration: Nov 7 2004 → Nov 12 2004

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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Ishihara, T., Ando, M., Enoki, M., & Takita, Y. (2006). Oxide ion conductivity in La(Sr)Ga(Fe,Mg)O₃ and its application for solid oxide fuel cells. Journal of Alloys and Compounds, 408-412, 507-511. https://doi.org/10.1016/j.jallcom.2004.12.086

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title = "Oxide ion conductivity in La(Sr)Ga(Fe,Mg)O3 and its application for solid oxide fuel cells",

abstract = "Oxide ion conductivity in La(Sr)Ga(Fe,Mg)O3 was investigated in this study and it was found that the oxide ion conductivity increased significantly by doping Fe into Ga site. Although the electrical conductivity monotonically increased with increasing amount of Fe, partial electronic conduction became significant. On the other hand, doping Mg for Ga site simultaneously with Fe is useful for keeping high transport number. By doping Fe for Ga site, perovskite oxide with cubic structure seems to be stabilized and the solid solution limit for Sr for La site is expanded. Considering the transport number of oxide ion and the electronic conductivity, the optimum composition for oxide ion conductivity in this system is La0.7Sr 0.3Ga0.7Fe0.2Mg0.1O3 - δ (LSGFM73721). By using this oxide for electrolyte, large power density of 200 mW/cm2 can be achieved at 873 K.",

author = "Tatsumi Ishihara and Masaki Ando and Makiko Enoki and Yusaku Takita",

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pages = "507--511",

journal = "Journal of Alloys and Compounds",

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T1 - Oxide ion conductivity in La(Sr)Ga(Fe,Mg)O3 and its application for solid oxide fuel cells

AU - Ishihara, Tatsumi

AU - Ando, Masaki

AU - Enoki, Makiko

AU - Takita, Yusaku

PY - 2006/2/9

Y1 - 2006/2/9

N2 - Oxide ion conductivity in La(Sr)Ga(Fe,Mg)O3 was investigated in this study and it was found that the oxide ion conductivity increased significantly by doping Fe into Ga site. Although the electrical conductivity monotonically increased with increasing amount of Fe, partial electronic conduction became significant. On the other hand, doping Mg for Ga site simultaneously with Fe is useful for keeping high transport number. By doping Fe for Ga site, perovskite oxide with cubic structure seems to be stabilized and the solid solution limit for Sr for La site is expanded. Considering the transport number of oxide ion and the electronic conductivity, the optimum composition for oxide ion conductivity in this system is La0.7Sr 0.3Ga0.7Fe0.2Mg0.1O3 - δ (LSGFM73721). By using this oxide for electrolyte, large power density of 200 mW/cm2 can be achieved at 873 K.

AB - Oxide ion conductivity in La(Sr)Ga(Fe,Mg)O3 was investigated in this study and it was found that the oxide ion conductivity increased significantly by doping Fe into Ga site. Although the electrical conductivity monotonically increased with increasing amount of Fe, partial electronic conduction became significant. On the other hand, doping Mg for Ga site simultaneously with Fe is useful for keeping high transport number. By doping Fe for Ga site, perovskite oxide with cubic structure seems to be stabilized and the solid solution limit for Sr for La site is expanded. Considering the transport number of oxide ion and the electronic conductivity, the optimum composition for oxide ion conductivity in this system is La0.7Sr 0.3Ga0.7Fe0.2Mg0.1O3 - δ (LSGFM73721). By using this oxide for electrolyte, large power density of 200 mW/cm2 can be achieved at 873 K.

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JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

T2 - Proceedings of the Rare Earths'04 in Nara, Japan

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