Vacancy and interstitial oxide ion migration in heavily doped La 2-xSr xCoO 4±δ

C Tealdi, C Ferrara, P Mustarelli, M Saiful Islam

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Abstract

La 2-xSr xCoO 4±δ, a K 2NiF 4-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 La 2-xSr xCoO 4±δ material for high Sr levels (x > 0.8). In the oxygen-deficient composition La 0.8Sr 1.2CoO 3.9 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 La 1.2Sr 0.8CoO 4.1 interstitial oxygen transport is via an interstitialcy mechanism and within the ab plane.
Original languageEnglish
Pages (from-to)8969-8975
Number of pages7
JournalJournal of Materials Chemistry
Volume22
Issue number18
DOIs
Publication statusPublished - 2012

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