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

Sebastian, Litty ; Shukla, A. K. ; Gopalakrishnan, J. (2000) La0.9Sr0.1Ga0.8M0.2O3-δ (M = Mn, Co, Ni, Cu or Zn): transition metal-substituted derivatives of lanthanum-strontium-galliummagnesium (LSGM) perovskite oxide ion conductor Bulletin of Materials Science, 23 (3). pp. 169-173. ISSN 0250-4707

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Official URL: http://www.ias.ac.in/matersci/bmsjun2000/169.pdf

Related URL: http://dx.doi.org/10.1007/BF02719904

Abstract

Perovskite oxides of the general formula, La0.9Sr0.1Ga0.8M0.2O3-δ for M = Mn, Co, Ni, Cu and Zn, have been prepared and investigated. All the oxides exhibit high electrical conductivities (s R~ 10-2 S/cm at 800° C) comparable to that of the best perovskite oxide ion conductor, La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM) (s ~ 8 × 10-2 S/cm at 800° 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 (pO2 ≥ 1 atm), arising from mixed-valency of the transition metals, the M = Zn(II) phase is a pure oxide ion conductor exhibiting a conductivity (σ ~ 1.5 × 10-2 S/cm at 800° 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:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:LSGM Substitution; Mixed Ionic-electronic Conductors; Oxide Ion Conductor
ID Code:83219
Deposited On:17 Feb 2012 04:34
Last Modified:19 May 2016 00:09

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