Oxygen nonstoichiometry and thermo-chemical stability of perovskite-type La0.6Sr0.4Co1-yFeyO 3-δ (y = 0, 0.2, 0.4, 0.5, 0.6, 0.8, 1) materials

M. Kuhn, Y. Fukuda, Shinichi Hashimoto, Kazuhisa Sato, Keiji Yashiro, J. Mizusaki

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49 Citations (Scopus)

Abstract

The oxygen nonstoichiometry of La0.6Sr0.4Co 1-yFeyO3-δ (LSCF) mixed-conducting perovskite oxides strongly depends on the iron content: the cobalt-rich compounds (y = 0, 0.2, 0.4) were previously reported to show a sharp decrease in oxygen content with reducing atmosphere, while the oxygen vacancy concentration increased steadily for the iron-rich compounds (y = 0.6, 0.8) with a plateau at intermediate oxygen partial pressures for y = 1. Here we measured the oxygen content of LSCF with y = 0.5 by thermogravimetry and coulometric titration as a function of oxygen partial pressure and temperature. No transitional behavior could be observed for La0.6 Sr0.4Co0.5Fe 0.5O3-δ, the oxygen nonstoichiometry showed the same trend as for the cobalt-rich compounds. While the cobalt-rich compounds exhibit a metallic band structure, a semiconducting model fits the data best for the iron-rich compounds. Except for y = 1, the thermo-chemical stability of LSCF was little affected by the iron dopant content, all compounds (0 ≤ y ≤ 0.8) decomposed at similar oxygen partial pressures.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume160
Issue number1
DOIs
Publication statusPublished - 2013 Apr 12

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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