Half-Heusler phases and nanocomposites as emerging high-ZT thermoelectric materials View Full Text


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Article Info

DATE

2011-11-04

AUTHORS

S. Joseph Poon, Di Wu, Song Zhu, Wenjie Xie, Terry M. Tritt, Peter Thomas, Rama Venkatasubramanian

ABSTRACT

Half-Heusler (HH) phases, a versatile class of alloys with promising functional properties, have recently gained attention as emerging thermoelectric materials. These materials are investigated from the perspective of thermal and electronic transport properties for enhancing the dimensionless figure of merit (ZT) at 800–1000 K. The electronic origin of thermopower enhancement is reviewed. Grain refinement and embedment of nanoparticles in HH alloy hosts were used to produce fine-grained as well as nanocomposites and monolithic nanostructured materials. Present experiments indicated that n-type Hf 0.6 Zr 0.4 NiSn 0.995 Sb 0.005 HH alloys and p-type Hf 0.3 Zr 0.7 CoSn 0.3 Sb 0.7 /nano-ZrO 2 composites can attain ZT = 1.05 and 0.8 near 900–1000 K, respectively. The observed ZT enhancements could be attributed to multiple origins; in particular, the electronic origin was identified. The prospect for higher ZT was investigated in light of a recently developed nanostructure model of lattice thermal conductivity. Tests performed on p–n couple devices from the newly developed HH materials showed good power generation efficiencies—achieving 8.7% efficiency for hot-side temperatures of about 700 °C. More... »

PAGES

2795-2802

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1557/jmr.2011.329

DOI

http://dx.doi.org/10.1557/jmr.2011.329

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1033377774


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