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

doi:10.1149/1.3570179

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 proceeding › Conference contribution

24 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 language	English
Title of host publication	Solid Oxide Fuel Cells 12, SOFC XII
Pages	1899-1907
Number of pages	9
Edition	3 PART 3
DOIs	https://doi.org/10.1149/1.3570179
Publication status	Published - 2011
Event	12th International Symposium on Solid Oxide Fuel Cells, SOFC-XII - 219th ECS Meeting - Montreal, QC, Canada Duration: 2011 May 1 → 2011 May 6

Publication series

Name	ECS Transactions
Number	3 PART 3
Volume	35
ISSN (Print)	1938-5862
ISSN (Electronic)	1938-6737

Other

Other	12th International Symposium on Solid Oxide Fuel Cells, SOFC-XII - 219th ECS Meeting
Country/Territory	Canada
City	Montreal, QC
Period	11/5/1 → 11/5/6

ASJC Scopus subject areas

Engineering(all)

Access to Document

10.1149/1.3570179

Cite this

Yashiro, K., Nakano, I., Kuhn, M., Hashimoto, S., Sato, K., & Miuzusaki, J. (2011). 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). In Solid Oxide Fuel Cells 12, SOFC XII (3 PART 3 ed., pp. 1899-1907). (ECS Transactions; Vol. 35, No. 3 PART 3). https://doi.org/10.1149/1.3570179

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). / Yashiro, Keiji; Nakano, Issei; Kuhn, Melanie et al.

Solid Oxide Fuel Cells 12, SOFC XII. 3 PART 3. ed. 2011. p. 1899-1907 (ECS Transactions; Vol. 35, No. 3 PART 3).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Yashiro, K, Nakano, I, Kuhn, M, Hashimoto, S, Sato, K & Miuzusaki, J 2011, 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). in Solid Oxide Fuel Cells 12, SOFC XII. 3 PART 3 edn, ECS Transactions, no. 3 PART 3, vol. 35, pp. 1899-1907, 12th International Symposium on Solid Oxide Fuel Cells, SOFC-XII - 219th ECS Meeting, Montreal, QC, Canada, 11/5/1. https://doi.org/10.1149/1.3570179

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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.",

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AB - 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.

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