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

Published online by Cambridge University Press:  04 November 2011

S. Joseph Poon ,
Di Wu ,
Song Zhu ,
Wenjie Xie ,
Terry M. Tritt ,
Peter Thomas  and
Rama Venkatasubramanian
S. Joseph Poon*
Affiliation:
Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714
Di Wu
Affiliation:
Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714
Song Zhu
Affiliation:
Department of Physics & Astronomy, Clemson University, Clemson, South Carolina 29634
Wenjie Xie
Affiliation:
Department of Physics & Astronomy, Clemson University, Clemson, South Carolina 29634
Terry M. Tritt
Affiliation:
Department of Physics & Astronomy, Clemson University, Clemson, South Carolina 29634
Peter Thomas
Affiliation:
Center for Solid State Energetics, RTI International, Research Triangle Park, North Carolina 27709
Rama Venkatasubramanian
Affiliation:
Center for Solid State Energetics, RTI International, Research Triangle Park, North Carolina 27709
*
a)Address all correspondence to this author. e-mail: sjp9x@virginia.edu
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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 Hf0.6Zr0.4NiSn0.995Sb0.005 HH alloys and p-type Hf0.3Zr0.7CoSn0.3Sb0.7/nano-ZrO2 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.

Keywords

NanostructureThermoelectricThermal conductivity
Type
Invited Feature Papers
Information
Journal of Materials Research , Volume 26 , Issue 22 , 28 November 2011 , pp. 2795 - 2802
Copyright
Copyright © Materials Research Society 2011

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