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- Title
Effect of Nb Doping on Thermoelectric Properties of TiNiSn Half-Heusler Alloy Prepared by Microwave Method.
- Authors
Rui-Peng Zhang; Bo, Lin; Wang, Xing-Long; Wang, Wen-Ying; Zhu, Jun-Liang; Zhao, Ling-Hao; Zuo, Min; Zhao, De-Gang
- Abstract
The inherent high thermal conductivity of TiNiSn half-Heusler (HH) alloy, as well as the long preparation cycle time and high cost of conventional preparation methods limited its commercial application. Herein, Ti1 – xNbxNiSn half-Heusler alloys with low lattice thermal conductivity were successfully prepared by microwave synthesis combined with rapid hot-pressing sintering, which significantly shortened the preparation cycle and ensured high density of TiNiSn half-Heusler alloys. The effects of Nb substitution at Ti sites on the composition distribution, thermal and electrical transport properties of Ti1 – xNbxNiSn half-Heusler samples were studied. The maximum ZT value of Ti0.9Nb0.1NiSn sample was 0.39 at 725 K due to the increase of power factor (PF) and the decrease of lattice thermal conductivity caused by the enhanced phonon scattering, which was about 204% higher than that of undoped TiNiSn.
- Subjects
THERMOELECTRIC materials; MICROWAVE sintering; HEUSLER alloys; ALLOYS; MICROWAVES; PHONON scattering; THERMAL conductivity
- Publication
Physics of Metals & Metallography, 2023, Vol 124, Issue 13, p1341
- ISSN
0031-918X
- Publication type
Article
- DOI
10.1134/S0031918X22601925