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Synthesis and Thermoelectric Properties of Y-doped Ca3Co4O9 Ceramics

Published online by Cambridge University Press:  01 February 2011

Julio E. Rodriguez  and
Luis Carlos Moreno
Julio E. Rodriguez
Affiliation:
[email protected], Universidad Nacional de Colombia, Department of Physics, Apartado Aereo 85814, Bogota, 01, Colombia, +57 1 3165000 X13021, +57 1 3165135
Luis Carlos Moreno
Affiliation:
[email protected], Universidad Nacional de Colombia, Department of Chemistry, Bogota, Colombia
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Abstract

Polycrystalline ceramics with nominal composition of Ca3-xYxCo4O9+δ (0≤x≤0.10) were grown using the citrate-complex method. Thermoelectric properties were studied using Seebeck coefficient S(T) and electrical resistivity ρ(T) measurements. These transport properties were studied in the temperature range between 100 and 290K. For low doping levels in Y substituted samples (x≤0.06) the magnitude of S(T) and ρ(T) decreases with yttrium content. The temperature behavior of S(T) and ρ(T) was interpreted in terms of the small-polaron hopping mechanism. From S(T) and ρ(T) data it was possible to calculate the thermoelectric power factor PF, which reaches maximum values close to 23 μW/K2-cm. These values become these compounds promissory thermoelectric compounds for use in low temperature thermoelectric applications.

Keywords

ceramicthermoelectricoxide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1267: Symposium DD – Thermoelectric Materials 2010-Growth, Properties, Novel Characterization Methods and Applications , 2010 , 1267-DD11-04
Copyright
Copyright © Materials Research Society 2010

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