TY - JOUR
T1 - Thermal and chemical lattice expansibility of La0.6Sr 0.4Co1-yFeyO3 - δ (y = 0.2, 0.4, 0.6 and 0.8)
AU - Hashimoto, Shin Ichi
AU - Fukuda, Yasuhiro
AU - Kuhn, Melanie
AU - Sato, Kazuhisa
AU - Yashiro, Keiji
AU - Mizusaki, Junichiro
N1 - Funding Information:
This work was supported by NEDO , Japan, as part of “Development of System and Elemental Technology on Solid Oxide Fuel Cells (SOFC)” project.
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/3/25
Y1 - 2011/3/25
N2 - Change in the lattice parameters of La0.6Sr0.4Co 1 - yFeyO3 - δ (y = 0.2, 0.4, 0.6 and 0.8) was observed by in-situ XRD under the various temperature and oxygen partial pressure conditions for thermo-chemical expansivity study. By combination of the lattice parameters and oxygen non-stoichiometry, the linear thermal expansion rates were formulated in each compound. The obtained formulas are expressed as a linear function of temperature and oxygen deficiency with the standard deviations from measured data less than 1.2%. Based on the formulas, apparent thermal expansions were separated into thermally induced part and chemically induced part. Thermal expansion coefficient αth, which is proportional constant for temperature, is increased with increasing Co content in La0.6Sr0.4Co1 - yFe yO3 - δ while chemical expansion coefficient αchem, which is proportional constant for oxygen deficiency, shows very small dependence on the composition. Increase in apparent thermal expansion with increasing Co content in La0.6Sr0.4Co 1 - yFeyO3 - δ was caused by the combination of αth and αchem.
AB - Change in the lattice parameters of La0.6Sr0.4Co 1 - yFeyO3 - δ (y = 0.2, 0.4, 0.6 and 0.8) was observed by in-situ XRD under the various temperature and oxygen partial pressure conditions for thermo-chemical expansivity study. By combination of the lattice parameters and oxygen non-stoichiometry, the linear thermal expansion rates were formulated in each compound. The obtained formulas are expressed as a linear function of temperature and oxygen deficiency with the standard deviations from measured data less than 1.2%. Based on the formulas, apparent thermal expansions were separated into thermally induced part and chemically induced part. Thermal expansion coefficient αth, which is proportional constant for temperature, is increased with increasing Co content in La0.6Sr0.4Co1 - yFe yO3 - δ while chemical expansion coefficient αchem, which is proportional constant for oxygen deficiency, shows very small dependence on the composition. Increase in apparent thermal expansion with increasing Co content in La0.6Sr0.4Co 1 - yFeyO3 - δ was caused by the combination of αth and αchem.
KW - Cathode
KW - Chemical expansion
KW - LSCF
KW - SOFC
KW - Thermal expansion
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U2 - 10.1016/j.ssi.2011.01.014
DO - 10.1016/j.ssi.2011.01.014
M3 - Article
AN - SCOPUS:79953238879
VL - 186
SP - 37
EP - 43
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
IS - 1
ER -