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

研究成果: ジャーナルへの寄稿学術誌査読

25 被引用数 (Scopus)

抄録

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).

本文言語英語
ページ(範囲)4112-4118
ページ数7
ジャーナルJournal of Solid State Chemistry
177
11
DOI
出版ステータス出版済み - 11月 2004
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • 凝縮系物理学
  • 物理化学および理論化学
  • 無機化学
  • 材料化学

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