Chemical stability of La 1-xSr xCrO 3 in oxidizing atmospheres

Shogo Miyoshi, Shigenori Onuma, Atsushi Kaimai, Hiroshige Matsumoto, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki, Harumi Yokokawa

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24 Citations (Scopus)

Abstract

The single-phase region of La 1-xSr xCrO 3 (x=0.1, 0.2, 0.3) was precisely determined as a function of temperature, P O2 and Sr content. The powders with the nominal composition of La 1-xSr xCrO 3 were equilibrated under various conditions, and then identified by XRD analyses. To confirm the equilibration, two independent experiments were performed for each composition observing (i) the precipitation of the second phase from a single-phase solid solution, and (ii) the formation of the single phase from the constituent oxides. Two kinds of second phases, SrCrO 4 and an unknown phase, were observed depending on the conditions. The second phases tended to appear at low temperature, in high P O2 and with a large Sr content. The single-phase regions obtained via the two equilibration routes were in good agreement with each other. The thermodynamic calculations on the supposition of ideality of the solid solution essentially reproduced the experimental results. When this material is used as the interconnects of solid oxide fuel cells, much attention should be paid to its relatively narrow solubility range of Sr; for example, the solubility limit is approximately 0.1 under a typical cathode-side condition (1273K, air).

Original languageEnglish
Pages (from-to)4112-4118
Number of pages7
JournalJournal of Solid State Chemistry
Volume177
Issue number11
DOIs
Publication statusPublished - 2004 Nov 1

Keywords

  • Chemical stability
  • Interconnector
  • La Sr CrO
  • Perovskite
  • Solid oxide fuel cell
  • Solubility limit

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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    Miyoshi, S., Onuma, S., Kaimai, A., Matsumoto, H., Yashiro, K., Kawada, T., Mizusaki, J., & Yokokawa, H. (2004). Chemical stability of La 1-xSr xCrO 3 in oxidizing atmospheres. Journal of Solid State Chemistry, 177(11), 4112-4118. https://doi.org/10.1016/j.jssc.2004.04.054