Oxygen permeation measurement of La1-xCaxCrO3-δ by using an electrochemical method

Natsuko Sakai, Teruhisa Horita, Harumi Yokokawa, Masayuki Dokiya, Tatsuya Kawada

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Oxygen permeation current density (JO2-) through La0.9Ca0.11CrO3-δ was measured by using an electrochemical method under an oxygen potential gradient, P(O2) = 1 ∼ 1 × 10-13 bar. The oxygen vacancy diffusion coefficient (Dv) is estimated 1.5 × 10-10 m2 s-1 in the P(O2) range from 10-5 to 10-10 bar. The oxygen permeation current density through 1 mm thick plate is estimated as 10 mA cm-2 in SOFC operation condition. The oxygen tracer diffusion coefficients via bulk (D*) and via grain boundary (D*gb) were estimated by SIMS for La1-x(CaxCrO3-δ (x = 0.1, 0.2). The contribution of grain boundary diffusion on permeation was considered in the oxidizing atmosphere, however, the bulk diffusion is dominant in a large oxygen potential gradient.

Original languageEnglish
Pages (from-to)1273-1278
Number of pages6
JournalSolid State Ionics
Volume86-88
Issue numberPART 2
DOIs
Publication statusPublished - 1996 Jul

Keywords

  • Chromium
  • Diffusion
  • Lanthanum
  • Leak
  • Oxygen
  • Permeation
  • SOFC

ASJC Scopus subject areas

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

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