Oxygen nonstoichiometry and thermo-chemical stability of La 0.6Sr0.4Co1-yFeyO 3-δ (y = 0.2, 0.4, 0.6, 0.8)

Shin Ichi Hashimoto, Yasuhiro Fukuda, Melanie Kuhn, Kazuhisa Sato, Keiji Yashiro, Junichiro Mizusaki

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)

Abstract

The oxygen nonstoichiometry of La0.6Sr0.4Co 1-yFeyO3-δ (y = 0.2, 0.4, 0.6, 0.8) was measured by high temperature gravimetry and coulometric titration. The results of the oxygen nonstoichiometry measurements could be categorized into Co rich compounds (y = 0.2, 0.4) and Fe rich compounds (y = 0.6, 0.8). The Co rich compounds decomposed into A2BO4 and CoO at relatively high PO2, i.e. ca.10-9 bar at 873 K, and ca. 10-6 bar at 1073 K. The apparent decomposition PO2 in the case of the Fe rich compounds shifted to the lower PO2 side, i.e. ca.10 -21 bar at 873 K, and ca. 10-15 bar at 1073 K. Before reaching this PO2, the gradual decomposition of the Fe rich compounds was observed by atmosphere controlled high temperature XRD. From the results of the measurement procedure dependence of the coulometric titration data, the actual decomposition PO2 of the Fe rich compounds can be considered almost comparable to those of the Co rich compounds.

Original languageEnglish
Pages (from-to)1713-1719
Number of pages7
JournalSolid State Ionics
Volume181
Issue number37-38
DOIs
Publication statusPublished - 2010 Dec 13

Keywords

  • Cathode
  • LSCF
  • Oxygen nonstoichiometry
  • Phase stability
  • SOFC

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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