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Title

Effect of Sr substitution for Ca on the Ca3Co4O 9 thermoelectric properties

AuthorsConstantinescu, G.; Rasekh, Sh.; Torres, M. A.; Diez, J. C.; Madre, M. A.; Sotelo, A.
KeywordsSintering
Cobaltites
Electrical properties
Thermopower
Doping
Issue Date2013
PublisherElsevier
CitationJournal of Alloys and Compounds 577: 511-515 (2013)
AbstractCa3-xSrxCo4O9 polycrystalline thermoelectric ceramics with small amounts of Sr have been synthesized by the classical solid state method. Microstructural characterizations have shown that all the Sr has been incorporated into the Ca3Co4O9 and Ca3Co2O 6 structures and no Sr-based secondary phases have been produced. Apparent density measurements have shown that samples slightly increase their density until 0.05 Sr content, decreasing for higher contents. Electrical resistivity decreases and Seebeck coefficient slightly raises when Sr content increases until 0.07 Sr addition. The improvement in both parameters leads to higher power factor values than the usually obtained in samples prepared by the conventional solid state routes and close to those obtained in textured materials. © 2013 Elsevier B.V. All rights reserved.
Publisher version (URL)http://dx.doi.org/10.1016/j.jallcom.2013.07.005
URIhttp://hdl.handle.net/10261/117557
DOI10.1016/j.jallcom.2013.07.005
Identifiersdoi: 10.1016/j.jallcom.2013.07.005
issn: 0925-8388
e-issn: 1873-4669
Appears in Collections:(ICMA) Artículos
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