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High temperature thermoelectric properties of BaxYbyFe3CoSb12 p-type skutterudites

Published online by Cambridge University Press:  05 June 2015

Yongkwan Dong ,
George S. Nolas ,
Xiaoyu Zeng  and
Terry M. Tritt
Yongkwan Dong
Affiliation:
Department of Physics, University of South Florida, Tampa, Florida 33620, USA
George S. Nolas*
Affiliation:
Department of Physics, University of South Florida, Tampa, Florida 33620, USA
Xiaoyu Zeng
Affiliation:
Department of Physics and Astronomy, Kinard Laboratory, Clemson University, Clemson, South Carolina 29634, USA
Terry M. Tritt
Affiliation:
Department of Physics and Astronomy, Kinard Laboratory, Clemson University, Clemson, South Carolina 29634, USA
*
a)Address all correspondence to this author. e-mail: gnolas@usf.edu
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Abstract

Double-filled high Fe content skutterudites, BaxYbyFe3CoSb12 (x + y = 1), were synthesized to investigate their high temperature transport properties. Both their phase and stoichiometry were characterized by powder x-ray diffraction and energy dispersive spectroscopy. The Seebeck coefficient, S, and electrical resistivity, ρ, increase with increasing temperature for all specimens over the entire measured temperature range. The thermal conductivity for the two low Ba content specimens decreases with increasing temperature up to 550 K at which point it increases with temperature due to bipolar diffusion. Bipolar diffusion becomes negligible with increasing Ba content. Due to this low bipolar diffusion, the ZT values of the higher Ba content specimens increase linearly with temperature, with the highest ZT value obtained for Ba0.9Yb0.1Fe3CoSb12.

Keywords

ytterbiumskutteruditesp-typethermoelectricssemiconductor
Type
Invited Review
Information
Journal of Materials Research , Volume 30 , Issue 17: Focus Issue: Advances in Thermoelectric Materials II , 14 September 2015 , pp. 2558 - 2563
Copyright
Copyright © Materials Research Society 2015 

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