Thermoelectric properties of Bi-added Co4Sb12 skutterudites

Mallik, RC and Anbalagan, R and Raut, KK and Bali, A and Royanian, E and Bauer, E and Rogl, G and Rogl, P (2013) Thermoelectric properties of Bi-added Co4Sb12 skutterudites. In: JOURNAL OF PHYSICS-CONDENSED MATTER, 25 (10).

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Abstract

Void filling in (I) Bi-x-added Co4Sb12 or (II) Sb/Bi substitution of Co4Sb12-xBix has been investigated for structural and thermoelectric properties evaluation. X-ray powder data Rietveld refinements combined with electron probe microanalyses showed a polycrystalline and practically Bi-free CoSb3 skutterudite phase as the major constituent as well as a secondary Bi phase in the grain boundaries. For series I alloys, the electrical conductivity, Seebeck coefficient and thermal conductivity were measured as a function of temperature in the range from 450 to 750 K. The electrical conductivity of all the samples increased with increasing temperature, showing a semiconducting nature with smaller values of the Seebeck coefficient for higher Bi fractions. Conduction over the entire temperature range was found to arise from a single p-type carrier. Thermal conductivity showed a reduction with Bi added in all the samples, except for Bi0.75Co4Sb12, and the lowest lattice thermal conductivity was found for a Bi-added fraction of 0.5. The maximum zT value of 0.53 at 632 K is higher than that of Co4Sb12.

Item Type:	Journal Article
Publication:	JOURNAL OF PHYSICS-CONDENSED MATTER
Publisher:	IOP PUBLISHING LTD
Additional Information:	Copyright for this article belongs to IOP PUBLISHING LTD, ENGLAND
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	22 Mar 2013 07:26
Last Modified:	22 Mar 2013 07:26
URI:	http://eprints.iisc.ac.in/id/eprint/46155

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