Property of (La, Ca) CrO3 for interconnection in solid oxide fuel cell (Part 2) - Durability

Haruo Nishiyama, Masanobu Aizawa, Natsuko Sakai, Harumi Yokokawa, Tatsuya Kawada, Masayuki Dokiya

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The chemical stability of calcium doped lanthanum chromites as SOFC interconnect was investigated by annealing in air and durability test under the simulated SOFC operating conditions. The effects of calcium content, A-site excess, water vapor pressure and silicon as impurity were checked. Stable electrical conductivity was obtained in SOFC operating test up to 300 h for the samples with lower calcium content and no A-site excess under the silicon-free conditions. The powders calcined at higher temperatures resulted in better durability. After the tests, Ca5(CrO4)3O0.5 was detected in XRD on the surface exposed in oxidizing atmosphere. Silicon component reacts with Ca-rich secondary phase in the samples and form Ca4SiO4, which degrades the electrical conductivity.

Original languageEnglish
Pages (from-to)527-534
Number of pages8
JournalJournal of the Ceramic Society of Japan
Volume109
Issue number1270
DOIs
Publication statusPublished - 2001 Jun

Keywords

  • Durability
  • Interconnect
  • Lanthanum calcium chromite
  • Secondary phases
  • Stability for annealing treatment

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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