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Issue 18, 2012
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Vacancy and interstitial oxide ion migration in heavily doped La2−xSrxCoOδ

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Abstract

La2xSrxCoOδ, a K2NiF4-type structured oxide, is currently under investigation for its possible application as a cathode material in solid oxide fuel cells operating at intermediate temperature (IT-SOFCs). Here we report a combined energy minimization and molecular dynamics study of oxygen migration mechanisms in the La2−xSrxCoOδ material for high Sr levels (x > 0.8). In the oxygen-deficient composition La0.8Sr1.2CoO3.9 the oxide-ion transport mainly occurs through the migration of oxygen vacancies within the perovskite layer of the structure, with possible vacancy paths between adjacent layers. In the oxygen-rich composition La1.2Sr0.8CoO4.1 interstitial oxygen transport is via an interstitialcy mechanism and within the ab plane.

Graphical abstract: Vacancy and interstitial oxide ion migration in heavily doped La2−xSrxCoO4±δ

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Publication details

The article was received on 08 Feb 2012, accepted on 05 Mar 2012 and first published on 28 Mar 2012


Article type: Paper
DOI: 10.1039/C2JM30769C
Citation: J. Mater. Chem., 2012,22, 8969-8975
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    Vacancy and interstitial oxide ion migration in heavily doped La2−xSrxCoOδ

    C. Tealdi, C. Ferrara, P. Mustarelli and M. S. Islam, J. Mater. Chem., 2012, 22, 8969
    DOI: 10.1039/C2JM30769C

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