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La0.9Sr0.1Ga0.8M0.2O3-delta (M = Mn, Co, Ni, Cu or Zn): transition metal-substituted derivatives of lanthanum- strontium-gallium-magnesium (LSGM) perovskite oxide ion conductor

Sebastian, Litty and Shukla, AK and Gopalakrishnan, J (2000) La0.9Sr0.1Ga0.8M0.2O3-delta (M = Mn, Co, Ni, Cu or Zn): transition metal-substituted derivatives of lanthanum- strontium-gallium-magnesium (LSGM) perovskite oxide ion conductor. In: Bulletin of Materials Science, 23 (3). pp. 169-173.

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Abstract

Perovskite oxides of the general formula, La0.9Sr0.1Ga0.8M0.2O3-delta for M = Mn, Co, Ni, Cu and Zn, have been prepared and investigated. All the oxides exhibit high electrical conductivities (sigma similar to 10(-2) S/cm at 800 degrees C) comparable to that of the best perovskite oxide ion conductor, La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM) (sigma similar to 8 x 10(-2) S/cm at 800 degrees C), While M = Mn, Co, Ni, Cu members appear to be mixed conductors with a variable electronic contribution to the conductivity, especially at high oxygen partial pressures (pO(2) greater than or equal to 1 atm), arising from mixed-valency of the transition metals, the M = Zn(II) phase is a pure oxide ion conductor exhibiting a conductivity (sigma similar to 1.5 x 10(-2) Slcm at 800 degrees C) that is slightly lower than that of LSGM. The lower conductivity of the M = Zn(II) derivative could be due to the preference of Zn(II) for a tetrahedral oxygen coordination.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Indian Academy Sciences.
Keywords: LSGM substitution;mixed ionic–electronic conductors;oxide ion conductor
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 30 Sep 2004
Last Modified: 19 Sep 2010 04:15
URI: http://eprints.iisc.ernet.in/id/eprint/1709

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