Low temperature sintering ability and electrical conductivity of SOFC interconnect material La0.7Ca0.3Cr0.97O3

Songlin Wang, Lin Bin, Kui Xie, Yingchao Dong, Xingqin Liu*, Guangyao Meng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Relatively low temperature (1150-1300 °C) sintering characteristics and electric conductivities of La0.7Ca0.3Cr0.97O3 with a slight Cr deficiency of 0.03, prepared by an auto-ignition process, have been discussed. The material could reach 94.3% relative density at 1200 °C for 5 h in air, which is about 200 °C lower than that of with no Cr deficiency. XRD results indicated that pure perovskite phase was formed after sintered at the temperature range of 1150-1300 °C. The sample sintered at 1250 °C had the maximum conductivity of 62.0 S cm-1 at 850 °C in air, which is about 2.6 times as high as that of La0.7Ca0.3CrO3 with no Cr deficiency. In pure H2, it got the maximum electrical conductivity of 3.3 S cm-1 at 850 °C as sintered at 1200 °C. The TEC of the material was about 11.4 × 10-6 K-1, which is very compatible to that of other common used SOFC components. Therefore, it is a simple and cost-effective interconnect material for SOFCs.

Original languageEnglish (US)
Pages (from-to)499-504
Number of pages6
JournalJournal of Alloys and Compounds
Volume468
Issue number1-2
DOIs
StatePublished - Jan 22 2009

Keywords

  • Auto-ignition process
  • Cr deficiency
  • Interconnect
  • Lanthanum chromite
  • SOFC

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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