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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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.
|Title:||Thermoelectric Properties of Co4Sb12 Skutterudite Materials with Partial In Filling and Excess In Additions|
|Date:||27 January 2009|
|Journal or Publication Title:||Journal of Electronic Materials|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1337-1343|
|Keywords:||Skutterudite - thermoelectric - electrical conductivity - thermal conductivity - Seebeck coefficient|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Transport|
|HGF - Program Themes:||V BF - Bodengebundene Fahrzeuge|
|DLR - Research area:||Transport|
|DLR - Program:||V BF - Bodengebundene Fahrzeuge|
|DLR - Research theme (Project):||V - Fahrzeugenergiesysteme (old)|
|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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