Experimental determination of oxygen permeation flux through bulk and grain boundary of La0.7Ca0.3CrO3

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

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

Oxygen permeation flux through La0.7Ca0.3CrO3 was determined by an electrochemical method. Yttria-stabilized zirconia (YSZ) was used as an oxygen pump/sensor to apply an oxygen potential gradient over the sample, and the steady state current was recorded. The oxygen vacancy diffusion coefficient, Dv, was determined to be 1 × 10-5 cm2 s-1 assuming a random defect model. The tracer exchange experiment was performed at 1273 K in 18O enriched O2 (0.2 bar), and the sample was analyzed by a depth profiling and imaging technique using a secondary ion mass spectrometer (SIMS). The existence of fast diffusion paths along grain boundaries was confirmed. The bulk tracer diffusion coefficient, D*, was calculated to be 2 × 10-12 cm2 s-1 in air, which was about 6 times higher than that expected from the electrochemical measurement.

Original languageEnglish
Pages (from-to)201-207
Number of pages7
JournalSolid State Ionics
Volume79
Issue numberC
DOIs
Publication statusPublished - 1995 Jul
Externally publishedYes

Keywords

  • Grain boundary diffusion
  • Lanthanum cromite
  • Oxygen permeation
  • SIMS
  • Tracer diffusion

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Experimental determination of oxygen permeation flux through bulk and grain boundary of La<sub>0.7</sub>Ca<sub>0.3</sub>CrO<sub>3</sub>'. Together they form a unique fingerprint.

Cite this