High figure of merit in (Ti,Zr,Hf)NiSn half-Heusler alloys

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 nan...

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Bibliographic Details
Published in:Scripta materialia 2012-06, Vol.66 (12), p.1073-1076
Main Authors: Populoh, S., Aguirre, M.H., Brunko, O.C., Galazka, K., Lu, Y., Weidenkaff, A.
Format: Article
Language:English
Subjects:
Alloys
Figure of merit
Heusler phases
Nanocomposites
Nanomaterials
Nanostructure
Nickel
Phases
Scanning electron microscopy (SEM)
Thermal conductivity
Thermoelectricity
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Summary: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 2K
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2012.03.002