Oxygen nonstoichiometry of the perovskite-type oxide La 1-xCaxCrO3-δ (x=0.1, 0.2, 0.3)

Shigenori Onuma, Keiji Yashiro, Shogo Miyoshi, Atsushi Kaimai, Hiroshige Matsumoto, Yutaka Nigara, Tatsuya Kawada, Junichiro Mizusaki, Kenichi Kawamura, Natsuko Sakai, Harumi Yokokawa

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Abstract

The oxygen nonstoichiometry, δ, of La1-xCa xCrO3-δ (x=0.1-0.3) was measured by means of thermogravimetry as a function of oxygen partial pressure, P(O2), temperature, T, between 1073 and 1373 K, and the content of calcium, x. In any compositions, δ becomes larger and is getting closer to δ=x/2 with decreasing P(O2). At the same P(O2), δ of La 1-xCaxCiO3-δ increases with increasing T and x. There is almost no difference in oxygen nonstoichiometry between Ca-doped lanthanum chromite and Sr-doped lanthanum chromite. Defect chemical analysis was performed taking defect interaction into consideration. The nonstoichiometry curves were reproduced well by the proposed defect model and the obtained thermodynamic parameters. The influence of defect interaction on defect formation energy can be mainly attributed to change in interatomic potential due to defect-induced lattice expansion.

Original languageEnglish
Pages (from-to)287-293
Number of pages7
JournalSolid State Ionics
Volume174
Issue number1-4
DOIs
Publication statusPublished - 2004 Oct 29

Keywords

  • Defect chemistry
  • Defect interaction
  • Lanthanum chromite
  • Oxygen nonstoichiometry
  • Solid oxide fuel cells

ASJC Scopus subject areas

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

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    Onuma, S., Yashiro, K., Miyoshi, S., Kaimai, A., Matsumoto, H., Nigara, Y., Kawada, T., Mizusaki, J., Kawamura, K., Sakai, N., & Yokokawa, H. (2004). Oxygen nonstoichiometry of the perovskite-type oxide La 1-xCaxCrO3-δ (x=0.1, 0.2, 0.3). Solid State Ionics, 174(1-4), 287-293. https://doi.org/10.1016/j.ssi.2004.07.037