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Thermoelectric Power Factor of Polycrystalline La0.75Sr0.25Co1-xMnxO3-δ Ceramics

Published online by Cambridge University Press:  31 January 2011

Julio E. Rodríguez  and
J. A. Niño
Julio E. Rodríguez
Affiliation:
[email protected], Universidad Nacional de Colombia, Thermoelectric Materials Group, Department of Physics, Bogotá, Colombia
J. A. Niño
Affiliation:
[email protected], Universidad Nacional de Colombia, Thermoelectric Materials Group, Department of Physics, Bogotá, Colombia
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Abstract

Thermoelectric properties of polycrystalline La0.75Sr0.25Co1-xMnxO3-δ (0<x<0.08) (LSCoO-Mn) compounds have been studied. The samples were grown by solid-state reaction method; their transport properties were studied in the temperature range between 100 and 290K, as a function of temperature and the manganese content. The Seebeck coefficient (S) is positive over the measured temperature range and its magnitude increases with the manganese content up to values close to 160 μV/K. The electrical resistivity (ρ) goes from metallic to semiconducting behavior as the Mn level increases, at room temperature, ρ(T) exhibit values less than 4mΩ-cm. From S(T), ρ(T) and κ(T) data, the thermoelectric power factor and the figure of merit were determined. These performance parameters reach maximum values around 18 μW/K2-cm and 0.2, respectively. The observed behavior in the transport properties become these compounds potential thermoelectric materials, which could be used in thermoelectric applications.

Keywords

thermoelectricelectrical propertiesceramic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1166: Symposium N – Materials and Devices for Thermal-to-Electric Energy Conversion , 2009 , 1166-N09-04
Copyright
Copyright © Materials Research Society 2009

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