|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications IV
||Strategies for Improving the Thermoelectric Performance in Fe2VAl-type
||Ernst Bauer, Igor Kanpp, Ronja Kamelreiter, Karina Bulgakova, Florain Mussnig, V Kunnummel, Peter Rogl, Peter Prenninger
|On-Site Speaker (Planned)
Heusler (1-2-1) and half-Heusler (1-1-1) alloys have been shown to provide a promising base for well performing thermoelectric materials and a rather robust characteristics for applica-tions as thermoelectric generator. While the figure of merit ZT of half-Heusler alloys reached already values well above one, the overall performance of the full Heusler alloys is still lack-ing such values mostly because of the very large thermal conductivity found in this family of compounds.
In this contribution we show how doping and substitutions on the various lattice sites of the Heusler structure modifies the electronic transport in the system and, accordingly, how ther-mal conductivity decreases due to scattering of the heat carrying phonons on point defects. Additionally, we demonstrate how a substantial reduction of grain sizes by ball milling and severe plastic deformation positively influences thermal conductivity and thus improves the thermoelectric figure of merit.
Work supported by Christian Doppler Laboratory for Thermoelectricity.
||Planned: A print-only volume