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DS: Fachverband Dünne Schichten

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

DS 43.8: Vortrag

Freitag, 30. März 2012, 15:30–15:45, H 2032

Investigations on the Ti_xZr_yHf_zNiSn system. — •Michael Schwall and Benjamin Balke — Institute of Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg - University, Mainz

Half-Heusler compounds exhibit very promising thermoelectric properties for high temperature applications, combined with several additional advantages such as environmental friendliness, low production-costs and future availability of raw materials. The high thermoelectric potential can be mainly attributed to the high Seebeck coefficient and the low electrical resistivity values found recently in several half-Heusler alloys. The main obstacle is still their relatively high thermal conductivity. The best reported n-type materials are consisting of Ti_xZr_yHf_zNiSn with different x ,y ,z (x+y+z=1). In this study, we investigated the reasons for this outstanding thermoelectric properties. The effect of the microstructure on the transport properties will be described in details. The authors gratefully acknowledge the financial support by the "thermoHeusler" Project (Project No. 0327876D) of the German Federal Ministry of Economics and Technology (BMWi).