Unique Role of Refractory Ta Alloying in Enhancing the Figure of Merit of NbFeSb Thermoelectric Materials

Yu, Junjie; Fu, Chenguang; Liu, Yintu; Xia, Kaiyang; Aydemir, Umut; Chasapis, Thomas C.; Snyder, G. Jeffrey; Zhao, Xinbing; Zhu, Tiejun

doi:10.1002/aenm.201701313

Title: Unique Role of Refractory Ta Alloying in Enhancing the Figure of Merit of NbFeSb Thermoelectric Materials

Journal Article · Thu Sep 07 00:00:00 EDT 2017 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201701313· OSTI ID:1380019

Yu, Junjie ^[1]; Fu, Chenguang ^[1]; Liu, Yintu ^[1]; Xia, Kaiyang ^[1]; Aydemir, Umut ^[2]; Chasapis, Thomas C. ^[2]; Snyder, G. Jeffrey ^[2]; Zhao, Xinbing ^[1];

^[1]

State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China
Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA

Abstract NbFeSb‐based half‐Heusler alloys have been recently identified as promising high‐temperature thermoelectric materials with a figure of merit zT > 1, but their thermal conductivity is still relatively high. Alloying Ta at the Nb site would be highly desirable because the large mass fluctuation between them could effectively scatter phonons and reduce the lattice thermal conductivity. However, practically it is a great challenge due to the high melting point of refractory Ta. Here, the successful synthesis of Ta‐alloyed (Nb ₁₋ _x Ta _x ) _0.8 Ti _0.2 FeSb ( x = 0 – 0.4) solid solutions with significantly reduced thermal conductivity by levitation melting is reported. Because of the similar atomic sizes and chemistry of Nb and Ta, the solid solutions exhibit almost unaltered electrical properties. As a result, an overall zT enhancement from 300 to 1200 K is realized in the single‐phase Ta‐alloyed solid solutions, and the compounds with x = 0.36 and 0.4 reach a maximum zT of 1.6 at 1200 K. This work also highlights that the isoelectronic substitution by atoms with similar size and chemical nature but large mass difference should reduce the lattice thermal conductivity but maintain good electrical properties in thermoelectric materials, which can be a guide for optimizing the figure of merit by alloying.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐SC0001299

OSTI ID:: 1380019

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Vol. 8 Journal Issue: 1; ISSN 1614-6832

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 151 works

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