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DS: Fachverband Dünne Schichten

DS 43: Thermoelectric materials V: Bulk materials (Focused session – Organizers: Meyer, Heiliger)

DS 43.6: Vortrag

Freitag, 30. März 2012, 15:00–15:15, H 2032

Transport and thermal properties of single- and polycrystalline NiZr_0.5Hf_0.5Sn — Siham Ouardi^1,4, Gerhard H. Fecher^1,4, Claudia Felser^1,4, •Christian G.F. Blum², Dirk Bombor², Christian Hess², Bernd Büchner², Eiji Ikenaga³, and Sabine Wurmehl² — ¹Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg - Universität, Mainz, Germany — ²Leibniz Institute for Solid State and Materials Research IFW, 01171 Dresden, Germany — ³Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo 679-5198, Japan — ⁴Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany

The thermoelectric properties of a Heusler compound with NiZr_0.5Hf_0.5Sn composition were studied. A comparison of the properties of a single crystal and a polycrystal was carried out by measurements of the electrical conductivity, Seebeck coefficient, and thermal conductivity. The transport properties are directly compared to the valence band electronic structure measured by photoelectron spectroscopy. The single crystal shows a higher figure of merit (ZT=0.1) at room temperature which originates from the high electrical conductivity that is mediated by "in-gap" states observed by high energy photoemission spectroscopy.