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Thermoelectric Properties of Co4Sb12 Skutterudite Materials with Partial In Filling and Excess In Additions

Mallik, Ramesh-Chandra and Stiewe, Christian and Karpinski, Gabriele and Haßdorf, Ralf and Müller, Eckhard (2009) Thermoelectric Properties of Co4Sb12 Skutterudite Materials with Partial In Filling and Excess In Additions. Journal of Electronic Materials, 38 (7), pp. 1337-1343. DOI: 10.1007/s11664-009-0663-0. ISSN 1543-186X .

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Abstract

The properties of Co4Sb12 with various In additions were studied. X-ray diffraction revealed the presence of the pure δ-phase of In0.16Co4Sb12, whereas impurity phases (γ-CoSb2 and InSb) appeared for x = 0.25, 0.40, 0.80, and 1.20. The homogeneity and morphology of the samples were observed by Seebeck microprobe and scanning electron microscopy, respectively. All the quenched ingots from which the studied samples were cut were inhomogeneous in the axial direction. The temperature dependence of the Seebeck coefficient (S), electrical conductivity (σ), and thermal conductivity (κ) was measured from room temperature up to 673 K. The Seebeck coefficient of all In-added Co4Sb12 materials was negative. When the filler concentration increases, the Seebeck coefficient decreases. The samples with In additions above the filling limit (x = 0.22) show an even lower Seebeck coefficient due to the formation of secondary phases: InSb and CoSb2. The temperature variation of the electrical conductivity is semiconductor-like. The thermal conductivity of all the samples decreases with temperature. The central region of the In0.4Co4Sb12 ingot shows the lowest thermal conductivity, probably due to the combined effect of (a) rattling due to maximum filling and (b) the presence of a small amount of fine-dispersed secondary phases at the grain boundaries. Thus, regardless of the non-single-phase morphology, a promising ZT (S 2 σT/κ) value of 0.96 at 673 K has been obtained with an In addition above the filling limit.

Document Type:Article
Title:Thermoelectric Properties of Co4Sb12 Skutterudite Materials with Partial In Filling and Excess In Additions
Authors:
AuthorsInstitution or Email of Authors
Mallik, Ramesh-ChandraDepartment of Physics, Indian Institute of Science, Bangalore, 560 012, India
Stiewe, ChristianGerman Aerospace Center, Institute of Materials Research, Köln, Germany
Karpinski, GabrieleGerman Aerospace Center, Institute of Materials Research, Köln, Germany
Haßdorf, RalfGerman Aerospace Center, Institute of Materials Research, Köln, Germany
Müller, EckhardGerman Aerospace Center, Institute of Materials Research, Köln, Germany
Date:27 January 2009
Journal or Publication Title:Journal of Electronic Materials
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:38
DOI:10.1007/s11664-009-0663-0
Page Range:pp. 1337-1343
ISSN:1543-186X
Status:Published
Keywords:Skutterudite - thermoelectric - electrical conductivity - thermal conductivity - Seebeck coefficient
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Fahrzeugenergiesysteme (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Dr. Knud Zabrocki
Deposited On:24 Nov 2009 16:44
Last Modified:20 Mar 2013 19:42

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