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Fabrication of nanostructured bulk Cobalt Antimonide (CoSb3) based skutterudites via bottom-up synthesis

Published online by Cambridge University Press:  18 December 2012

M. Saleemi ,
M. Y. Tafti ,
M. S. Toprak ,
M. Stingaciu ,
M. Johnsson ,
M. Jägle ,
A. Jacquot  and
M. Muhammed
M. Saleemi*
Affiliation:
Department of Materials and Nanophysics, KTH Royal Institute of Technology, Kista-Stockholm, Sweden
M. Y. Tafti
Affiliation:
Department of Materials and Nanophysics, KTH Royal Institute of Technology, Kista-Stockholm, Sweden
M. S. Toprak
Affiliation:
Department of Materials and Nanophysics, KTH Royal Institute of Technology, Kista-Stockholm, Sweden
M. Stingaciu
Affiliation:
Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, Sweden
M. Johnsson
Affiliation:
Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, Sweden
M. Jägle
Affiliation:
Fraunhofer-Institut für Physikalische Messtechnik IPM, 79110 Freiburg, Germany
A. Jacquot
Affiliation:
Fraunhofer-Institut für Physikalische Messtechnik IPM, 79110 Freiburg, Germany
M. Muhammed
Affiliation:
Department of Materials and Nanophysics, KTH Royal Institute of Technology, Kista-Stockholm, Sweden
*
*Email: [email protected]
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Abstract

Skutterudites are known to be efficient thermoelectric (TE) materials in the temperature range from 600 K to 900 K. Dimensionless figure of merit (ZT) for filled skutterudite TE materials have been reported as ca. 1 at 800 K. Novel nano- engineering approaches and filling of the skutterudites crystal can further improve the transport properties and ultimately the ZT. Although classified among the promising TE materials, research on their large-scale production via bottom up synthetic routes is rather limited. In this work, large quantity of cobalt antimonide (CoSb3) based skutterudites nanopowder (NP) was fabricated through a room temperature co-precipitation precursor method. Dried precipitates were process by thermo-chemical treatment steps including calcination (in air) and reduction (in hydrogen). CoSb3 NPs were then mixed with silver (Ag) nanoparticles at different weight percentages (1%, 5% and 10% by wt) to form nanocomposites. Skutterudite NP was then consolidated by Spark Plasma Sintering (SPS) technique to produce highly dense compacts while maintaining the nanostructure. Temperature dependent TE characteristics of SPS’d CoSb3 and Ag containing nanocomposite samples were evaluated for transport properties, including thermal conductivity, electrical conductivity and Seebeck coefficient over the temperature range of 300 - 900 K. Physicochemical, structural and microstructural evaluation results are presented in detail.

Keywords

thermoelectricnanostructurepowder processing
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1490: Symposium B – Thermoelectric Materials Research and Device Development for Power Conversion and Refrigeration , 2013 , pp. 121 - 126
Copyright
Copyright © Materials Research Society 2012 

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References

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