Thermo-chemical lattice expansion in La0.6Sr 0.4Co1-YFeyO3-δ

M. Kuhn; S. Hashimoto; K. Sato; K. Yashiro; J. Mizusaki

doi:10.1016/j.ssi.2013.03.023

Thermo-chemical lattice expansion in La_0.6Sr _0.4Co_1-YFe_yO_3-δ

M. Kuhn, S. Hashimoto, K. Sato, K. Yashiro, J. Mizusaki

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

La_0.6Sr_0.4Co_{1 - y}Fe_yO _{3 - δ} (LSCF) mixed-conducting perovskite oxides, a SOFC cathode candidate material, exhibit oxygen nonstoichiometry under reducing atmosphere and elevated temperatures. Reduction of the B-site transition metals and formation of oxygen vacancies result in chemical expansion of the LSCF lattice. Knowledge of both thermal and chemical lattice expansion as a function of composition is an essential tool to tailor mismatches between different materials exposed to reducing and high temperature environments and avoid mechanical failure of the device. In this paper, thermal and chemical expansion coefficients were determined by measurement of the lattice parameters by HT-XRD as a function of pO₂ (in the range of 10^{- 4} to 1 bar), temperature (773-1173 K) and B-site composition. The lattice parameters were correlated with the previously investigated oxygen nonstoichiometry of the LSCF series. While the thermal expansion coefficient increases almost linearly with increasing Co content, the chemical expansion coefficient appears to be independent of B-site composition.

Original language	English
Pages (from-to)	12-16
Number of pages	5
Journal	Solid State Ionics
Volume	241
DOIs	https://doi.org/10.1016/j.ssi.2013.03.023
Publication status	Published - 2013

Keywords

Cathode
Chemical expansion
LSCF
SOFC
Thermal expansion

ASJC Scopus subject areas

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

Access to Document

10.1016/j.ssi.2013.03.023

Cite this

@article{aec088961bd94ad19d9b3119593646fa,

title = "Thermo-chemical lattice expansion in La0.6Sr 0.4Co1-YFeyO3-δ",

abstract = "La0.6Sr0.4Co1 - yFeyO 3 - δ (LSCF) mixed-conducting perovskite oxides, a SOFC cathode candidate material, exhibit oxygen nonstoichiometry under reducing atmosphere and elevated temperatures. Reduction of the B-site transition metals and formation of oxygen vacancies result in chemical expansion of the LSCF lattice. Knowledge of both thermal and chemical lattice expansion as a function of composition is an essential tool to tailor mismatches between different materials exposed to reducing and high temperature environments and avoid mechanical failure of the device. In this paper, thermal and chemical expansion coefficients were determined by measurement of the lattice parameters by HT-XRD as a function of pO2 (in the range of 10- 4 to 1 bar), temperature (773-1173 K) and B-site composition. The lattice parameters were correlated with the previously investigated oxygen nonstoichiometry of the LSCF series. While the thermal expansion coefficient increases almost linearly with increasing Co content, the chemical expansion coefficient appears to be independent of B-site composition.",

keywords = "Cathode, Chemical expansion, LSCF, SOFC, Thermal expansion",

author = "M. Kuhn and S. Hashimoto and K. Sato and K. Yashiro and J. Mizusaki",

note = "Funding Information: The authors gratefully acknowledge funding for this work by the Global COE (Centers of Excellence) Program at Tohoku University, Japan , and NEDO, Japan , as part of the “Development of System and Elemental Technology on Solid Oxide Fuel Cells (SOFC)” project.",

year = "2013",

doi = "10.1016/j.ssi.2013.03.023",

language = "English",

volume = "241",

pages = "12--16",

journal = "Solid State Ionics",

issn = "0167-2738",

publisher = "Elsevier",

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TY - JOUR

T1 - Thermo-chemical lattice expansion in La0.6Sr 0.4Co1-YFeyO3-δ

AU - Kuhn, M.

AU - Hashimoto, S.

AU - Sato, K.

AU - Yashiro, K.

AU - Mizusaki, J.

N1 - Funding Information: The authors gratefully acknowledge funding for this work by the Global COE (Centers of Excellence) Program at Tohoku University, Japan , and NEDO, Japan , as part of the “Development of System and Elemental Technology on Solid Oxide Fuel Cells (SOFC)” project.

PY - 2013

Y1 - 2013

N2 - La0.6Sr0.4Co1 - yFeyO 3 - δ (LSCF) mixed-conducting perovskite oxides, a SOFC cathode candidate material, exhibit oxygen nonstoichiometry under reducing atmosphere and elevated temperatures. Reduction of the B-site transition metals and formation of oxygen vacancies result in chemical expansion of the LSCF lattice. Knowledge of both thermal and chemical lattice expansion as a function of composition is an essential tool to tailor mismatches between different materials exposed to reducing and high temperature environments and avoid mechanical failure of the device. In this paper, thermal and chemical expansion coefficients were determined by measurement of the lattice parameters by HT-XRD as a function of pO2 (in the range of 10- 4 to 1 bar), temperature (773-1173 K) and B-site composition. The lattice parameters were correlated with the previously investigated oxygen nonstoichiometry of the LSCF series. While the thermal expansion coefficient increases almost linearly with increasing Co content, the chemical expansion coefficient appears to be independent of B-site composition.

AB - La0.6Sr0.4Co1 - yFeyO 3 - δ (LSCF) mixed-conducting perovskite oxides, a SOFC cathode candidate material, exhibit oxygen nonstoichiometry under reducing atmosphere and elevated temperatures. Reduction of the B-site transition metals and formation of oxygen vacancies result in chemical expansion of the LSCF lattice. Knowledge of both thermal and chemical lattice expansion as a function of composition is an essential tool to tailor mismatches between different materials exposed to reducing and high temperature environments and avoid mechanical failure of the device. In this paper, thermal and chemical expansion coefficients were determined by measurement of the lattice parameters by HT-XRD as a function of pO2 (in the range of 10- 4 to 1 bar), temperature (773-1173 K) and B-site composition. The lattice parameters were correlated with the previously investigated oxygen nonstoichiometry of the LSCF series. While the thermal expansion coefficient increases almost linearly with increasing Co content, the chemical expansion coefficient appears to be independent of B-site composition.

KW - Cathode

KW - Chemical expansion

KW - LSCF

KW - SOFC

KW - Thermal expansion

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