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, Xin Bing Zhao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

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.

Original languageEnglish (US)
Article number254104
JournalApplied Physics Letters
Volume100
Issue number25
DOIs
StatePublished - Jun 18 2012

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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