Effect of B-site substitution on the stability of La0.2Sr0.8Fe0.8B0.2O3− δ , B=Al, Ga, Cr, Ti, Ta, Nb

Ørjan Fossmark Lohne, Jonas Gurauskis, Tan Nhut Phung, Mari-Ann Einarsrud, Tor Grande, Henry J.M. Bouwmeester, Kjell Wiik

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Abstract: Single phase, cubic perovskites of composition La0.2 Sr 0.8 Fe 0.8 B 0.2 O 3− δ , B=Al, Ga, Cr, Ti, Ta and Nb, were prepared by spray pyrolysis from aqueous precursor solutions. The effect of B-site substitution on the stability in a H2 containing atmosphere was investigated using temperature programmed reduction (TPR). High temperature X-ray diffraction (HT-XRD) was performed under conditions similar to those in the TPR experiments. La0.2 Sr 0.8 FeO 3− δ forms a brownmillerite-type anion-deficient ordered perovskite upon reduction at T ≈500. B-site substitution suppresses oxygen vacancy ordering, maintaining a perovskite structure under the above reducing conditions up to T ≈700°C. Trends in the kinetics of decomposition of B-site substituted La0.2 Sr 0.8 FeO 3− δ are discussed.
Original languageEnglish
JournalSolid State Ionics
Volume225
Pages (from-to)186-189
ISSN0167-2738
DOIs
Publication statusPublished - 2012
Externally publishedYes

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