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Crystals 2017, 7(9), 256; doi:10.3390/cryst7090256

High Temperature Transport Properties of Yb and In Double-Filled p-Type Skutterudites

1
Department of Physics, University of South Florida, Tampa, FL 33620, USA
2
Department of Physics and Astronomy, Kinard Laboratory, Clemson University, Clemson, SC 29634, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Helmut Cölfen
Received: 18 July 2017 / Revised: 9 August 2017 / Accepted: 18 August 2017 / Published: 23 August 2017
(This article belongs to the Special Issue Materials Processing and Crystal Growth for Thermoelectrics)
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Abstract

Yb and In double-filled and Fe substituted polycrystalline p-type skutterudite antimonides were synthesized by direct reaction of high-purity elements, followed by solid-state annealing and densification by hot pressing. The stoichiometry and filling fraction were determined by both Rietveld refinement of the X-ray diffraction data and energy dispersive spectroscopic analyses. The transport properties were measured between 300 K and 830 K, and basically indicate that the resistivity and Seebeck coefficient both increase with increasing temperature. In both specimens, the thermal conductivity decreased with increasing temperature up to approximately 700 K, where the onset of bipolar conduction was observed. A maximum ZT value of 0.6 at 760 K was obtained for the Yb0.39In0.018Co2.4Fe1.6Sb12 specimen. View Full-Text
Keywords: thermoelectric; skutterudite; p-type; figure of merit; double-filled; bipolar diffusion thermoelectric; skutterudite; p-type; figure of merit; double-filled; bipolar diffusion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hobbis, D.; Liu, Y.; Wei, K.; Tritt, T.M.; Nolas, G.S. High Temperature Transport Properties of Yb and In Double-Filled p-Type Skutterudites. Crystals 2017, 7, 256.

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