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

研究成果: Conference contribution

19 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトルSolid Oxide Fuel Cells 12, SOFC XII
ページ1899-1907
ページ数9
3 PART 3
DOI
出版ステータスPublished - 2011 12 1
イベント12th International Symposium on Solid Oxide Fuel Cells, SOFC-XII - 219th ECS Meeting - Montreal, QC, Canada
継続期間: 2011 5 12011 5 6

出版物シリーズ

名前ECS Transactions
番号3 PART 3
35
ISSN(印刷版)1938-5862
ISSN(電子版)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)

フィンガープリント 「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)」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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