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Enhancement of Ca3Co4O9 thermoelectric properties by Cr for Co substitution

AutorDiez, J. C.; Torres, M. A.; Rasekh, Sh.; Constantinescu, G.; Madre, M. A.; Sotelo, A.
Palabras claveSintering
Electrical properties
Powders: solid state reaction
Fecha de publicación2013
CitaciónCeramics International 39(6): 6051-6056 (2013)
ResumenCa3Co4-xCrxO9 polycristalline thermoelectric ceramics with small amounts of Cr have been synthesized by the classical solid state method. Microstructural characterizations have shown that all the Cr has been incorporated into the Ca3Co4O 9 structure and no Cr-containing secondary phases have been produced for Cr contents≤0.05. Apparent density measurements have shown that all samples are very similar, with densities around 75% of the theoretical one. Electrical resistivity decreases and Seebeck coefficient slightly raises when Cr content increases until 0.05 Cr addition. The improvement in both parameters leads to higher power factor values than the usually obtained by conventional solid state routes. © 2013 Elsevier Ltd and Techna Group S.r.l.
Versión del editorhttp://dx.doi.org/10.1016/j.ceramint.2013.01.021
Identificadoresdoi: 10.1016/j.ceramint.2013.01.021
issn: 0272-8842
Aparece en las colecciones: (ICMA) Artículos
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