Electrical conductivity and oxygen diffusivity of perovskite-type solid solution La 0.6Sr 0.4Co 1-yFe yO 3-δ (y=0, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0)

Keiji Yashiro, Issei Nakano, Melanie Kuhn, Shinichi Hashimoto, Kazuhisa Sato, Junichiro Miuzusaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

19 Citations (Scopus)

Abstract

The electrical conductivity of La 0.6Sr 0.4Co 1-yFe yO 3-δ (y=0, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0) were measured as a function of P(O 2) and temperature. The conductivity variation can be well explained only by change in electron-hole concentration due to oxygen nonstoichiometry regardless of temperature. Conductivity relaxation analyses were also conducted to determine chemical diffusion coefficients by non-linear least squares fitting using the solution of Fick's diffusion equation. Oxygen vacancy diffusion coefficients were calculated using the chemical diffusion coefficients and oxygen nonstoichiometry. It should be emphasized that vacancy diffusion coefficients are not independent of oxygen vacancy concentration at lower temperature but steeply decrease with increase in oxygen vacancy concentration. These phenomena may cause the performance degradation of La 0.6Sr 0.4Co 1-yFe yO 3-δ cathode.

Original languageEnglish
Title of host publicationSolid Oxide Fuel Cells 12, SOFC XII
Pages1899-1907
Number of pages9
Edition3 PART 3
DOIs
Publication statusPublished - 2011 Dec 1
Event12th International Symposium on Solid Oxide Fuel Cells, SOFC-XII - 219th ECS Meeting - Montreal, QC, Canada
Duration: 2011 May 12011 May 6

Publication series

NameECS Transactions
Number3 PART 3
Volume35
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other12th International Symposium on Solid Oxide Fuel Cells, SOFC-XII - 219th ECS Meeting
CountryCanada
CityMontreal, QC
Period11/5/111/5/6

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'Electrical conductivity and oxygen diffusivity of perovskite-type solid solution La <sub>0.6</sub>Sr <sub>0.4</sub>Co <sub>1-y</sub>Fe <sub>y</sub>O <sub>3-δ</sub> (y=0, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0)'. Together they form a unique fingerprint.

Cite this