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 30.03.2011   Карта сайта     Language По-русски По-английски
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30.03.2011

Solid State Ionics
Volume 186, Issue 1, 25 March 2011, Pages 37-43





Thermal and chemical lattice expansibility of La0.6Sr0.4Co1 − yFeyO3 − δ (y = 0.2, 0.4, 0.6 and 0.8)


Shin-ichi Hashimotoa, low asterisk, E-mail The Corresponding Author, Yasuhiro Fukudab, Melanie Kuhnb, Kazuhisa Satob, Keiji Yashirob and Junichiro Mizusakib





a Graduate School of Environmental Studies, Tohoku University, Tohoku University, 6-6-01 Aoba, Aramaki, Aoba-ku, Sendai 980–8579, Japan


b Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-Ku, Sendai, 980–8577, Japan




Received 15 September 2010; 


revised 25 January 2011; 


accepted 26 January 2011. 


Available online 26 February 2011.











Abstract



Change in the lattice parameters of La0.6Sr0.4Co1 − 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 − yFeyO3 − 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 La0.6Sr0.4Co1 − yFeyO3 − δ was caused by the combination of αth and αchem.











Research Highlights



► Lattice parameter change of La0.6Sr0.4Co1-yFeyO3-δ was measured by in-situ XRD. ► Lattice parameters as a function of δ and temperature were formulated. ► The thermal expansion rates were formulated as a function of δ and temperature. ► The thermal expansion rates were separated into thermally part and chemically part.





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