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Increased electrical conductivity in fine-grained (Zr,Hf)NiSn based thermoelectric materials with nanoscale precipitates

Xie, Han-Hui and Yu, Cui and Zhu, Tie-Jun and Fu, Chen-Guang and Snyder, G. Jeffrey and Zhao, Xin-Bing (2012) Increased electrical conductivity in fine-grained (Zr,Hf)NiSn based thermoelectric materials with nanoscale precipitates. Applied Physics Letters, 100 (25). Art. No. 254104. ISSN 0003-6951. https://resolver.caltech.edu/CaltechAUTHORS:20120726-093938403

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Abstract

Grain refinement has been conducted to reduce the thermal conductivity and improve the thermoelectric performance of the (Zr,Hf)NiSn based half-Heusler alloys. Nanoscale in situ precipitates were found embedded in the matrix with submicron grains. The lattice thermal conductivity was decreased due to the enhanced boundary scattering of phonons. The increased carrier concentration and electrical conductivity were observed compared to the coarse-grained alloys, which is discussed in relation to the existence of nanoscale precipitates, the effect of antisite defects, and composition change. It is suggested that the nanoscale precipitates play a significant role in the observed electrical conductivity increase.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.4730436DOIUNSPECIFIED
http://apl.aip.org/resource/1/applab/v100/i25/p254104_s1PublisherUNSPECIFIED
Additional Information:© 2012 American Institute of Physics. Received 19 March 2012; accepted 7 June 2012; published online 21 June 2012. We acknowledge the use of EPMA in the Key Laboratory of Submarine Geosciences, State Oceanic Administration, China. T.J.Z. would like to thank Dr. Yanzhong Pei and Heng Wang from California Institute of Technology for the valuable discussions. The work is supported by the Natural Science Foundation of China (51171171, 51061120455, and 50971115) and the Fundamental Research Funds for the Central Universities (2011 QNA4034).
Funders:
Funding AgencyGrant Number
Natural Science Foundation of China (NSFC)51171171
Natural Science Foundation of China (NSFC)51061120455
Natural Science Foundation of China (NSFC)50971115
Fundamental Research Funds for the Central Universities2011QNA4034
Subject Keywords:carrier density; electrical conductivity; grain refinement; hafnium alloys; nickel alloys; phonons; thermal conductivity; thermoelectricity; tin alloys; zirconium alloys
Issue or Number:25
Classification Code:PACS: 72.15.Jf; 63.20.D-; 72.15.Eb. IPC: C22C13/00; C22C16/00; C22C19/00
Record Number:CaltechAUTHORS:20120726-093938403
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120726-093938403
Official Citation:Increased electrical conductivity in fine-grained (Zr,Hf)NiSn based thermoelectric materials with nanoscale precipitates Han-Hui Xie, Cui Yu, Tie-Jun Zhu, Chen-Guang Fu, G. Jeffrey Snyder, and Xin-Bing Zhao, Appl. Phys. Lett. 100, 254104 (2012), DOI:10.1063/1.4730436
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32739
Collection:CaltechAUTHORS
Deposited By: Aucoeur Ngo
Deposited On:26 Jul 2012 21:40
Last Modified:03 Oct 2019 04:03

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