Journal
SCRIPTA MATERIALIA
Volume 66, Issue 12, Pages 1073-1076Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2012.03.002
Keywords
Heusler phases; Thermoelectricity; Thermal conductivity; Scanning electron microscopy (SEM)
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Funding
- Swiss-electric, Honda
- Deutschen Forschungsgesellschaft within DFG [SPP1386]
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High-performance thermoelectric half-Heusler alloys with nominal compositions of Ti0.37Zr0.37Hf0.26NiSn were investigated. Scanning electron microscopy compositional mapping showed a remarkable separation of Ti and Zr + Hf rich phases, while Ni and Sn are homogeneously distributed. Additionally, a nanoscale phase separation of different half-Heusler phases was observed. The thermoelectric properties of the compounds were measured at 2 K < T < 900 K and showed a high figure of merit, reaching a value of ZT = 1 at 725 K. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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