Regensburg 2010 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 9: Poster: Synthesis of Nanostructured Films by Self-organization, Thermoelectric Thin Films and Nanostructures, High-k and Low-k Dielectrics, Layer Deposition Processes, Layer Growth, Layer Properties, Application of Thin Films, Surface Modification, Hard and Superhard Coatings, Metal Layers
DS 9.52: Poster
Montag, 22. März 2010, 15:00–17:30, Poster D1
Thermoelectric properties of ball-milled and subsequent short-term sintered Inx Co4 Sb12 skutterudites — •Andreas Sesselmann, Ralf Hassdorf, Lothar Böttcher, Christian Stiewe, Andreas Schmitz, and Eckard Müller — German Aerospace Center (DLR), Institute of Materials Research, 51170 Cologne, Germany
For more than a decade, CoSb3 has been widely studied as a promising thermoelectric (TE) material at intermediate temperatures. High thermoelectric figure of merit (ZT) in this material system can be achieved by filling guest atoms known as rattlers. One of the best improvements in ZT is reported when In is used as a filler atom leading to a ZTmax of about 1.2 at 575 K [1]. Another approach to lower the lattice thermal conductivity is by nano-structuring which leads to increased phonon scattering at the grain boundaries. The approach in this study is based on planetary ball milling, which allows for grain sizes on the nanometer scale and subsequent compaction by short-term sintering in favour of grain growth confinement. Phase homogeneity of the bulk material has been probed by XRD and EDX. TE properties (i.e. electrical conductivity, Seebeck coefficient, thermal conductivity) have been analyzed in the temperature range from 300 K to 700 K. The functional homogeneity of the samples was checked by Potential-Seebeck Microprobe (PSM). Based on these results, the combined effect of In filling and nano-structuring on the TE properties will be discussed.
T. He et al., Chemistry of Materials, 2006, 18, 759-762