Oxygen nonstoichiometry of B-site doped LaCrO3

Masatsugu Oishi, Keiji Yashiro, Jeong Oh Hong, Yutaka Nigara, Tatsuya Kawada, Junichiro Mizusaki

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Recently, B-site doping in the perovskite-type oxides has often been carried out to control various properties. One of the perovskite-type oxides, doped LaCrO3, is the candidate for the interconnector for Solid Oxide Fuel Cells (SOFC). For its stability under reducing atmospheres, B-site doped LaCrO3 is also one of the candidates for the anode of SOFC. The oxygen nonstoichiometry, δ, in B-site doped LaCrO3-δ was measured as a function of oxygen partial pressure at 973 K to 1373 K. The observed values of δ were different by the different B-site dopants, and also different from those of A-site doped LaCrO3. It was shown that only 10 mol% of dopant in B-site drastically affects the redox property of LaCrO3. Defect model for B-site controlled LaCrO3 was interpreted by assuming the reaction, 2CrCrX + VO•• + 1/2O2(g)⇔2CrCr + OOX.

Original languageEnglish
Pages (from-to)307-312
Number of pages6
JournalSolid State Ionics
Volume178
Issue number3-4
DOIs
Publication statusPublished - 2007 Feb 1

Keywords

  • B-site doping
  • LaCrO
  • Oxygen nonstoichiometry
  • Perovskite-type oxides
  • SOFC

ASJC Scopus subject areas

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

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