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Microwave synthesis and enhancement of thermoelectric performance in HfxTi1−xNiSn0.97Sb0.03 half-Heusler bulks
Anhui University of Technology, CHN.
Anhui University of Technology, CHN.
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
Changsha Research Institute of Mining and Metallurgy, CHN.
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2019 (English)In: Xiyou jinshu, ISSN 1001-0521, E-ISSN 1867-7185Article in journal (Refereed) Epub ahead of print
Abstract [en]

We obtained TiNiSn-based half-Heusler HfxTi1−xNiSn0.97Sb0.03 bulks with 85%–96% relative densities via 5-min microwave synthesis and 20-min microwave sintering in sealed vacuum. The phase composition and microstructure of samples were characterized by X-ray diffractometer (XRD) and scanning electron microscopy (SEM). Thermoelectric (TE) properties were measured, i.e., Seebeck coefficient (S), electrical resistivity (ρ), and thermal conductivity (κ) through Seebeck coefficient/resistance analysis system (S/RAs) and laser flash thermal analyzer (LFT). The results show that the nearly single phase exists after microwave sintering. The grain sizes and the number of grain boundaries decrease with increase in Hf-doping amount due to an increase in point defects. The matrix grains for Hf0.1Ti0.9NiSn0.97Sb0.03 are ~ 10 μm. The nanoscle pores and precipitates are present as second phases in matrix grain. The real composition for Hf0.1Ti0.9NiSn0.97Sb0.03 matrix grain is Hf3.51Ti28.76Ni34.76Sn31.55Sb1.43. The variation trends of electrical resistivity, Seebeck coefficient, power factor, and thermal conductivity were analyzed in detail. The maximum figure of merit (ZT) of 0.46 is obtained for Hf0.1Ti0.9NiSnSn0.97Sb0.03 at 723 K. The innovation route exhibits advantages for predation of TE bulks when compared to the conventional methods, especially in terms of efficiency while it still maintains TE performance. © 2019, The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature.

Place, publisher, year, edition, pages
University of Science and Technology Beijing , 2019.
Keywords [en]
Half-Heusler alloys, Hf doping, Microwave synthesis, Thermoelectric figure of merit, Antimony compounds, Electric conductivity, Grain boundaries, Microwave heating, Microwaves, Nickel compounds, Point defects, Scanning electron microscopy, Seebeck coefficient, Sintering, Thermal conductivity, Thermoanalysis, Thermoelectricity, Tin compounds, Conventional methods, Microwave sintering, Thermoelectric performance, X ray diffractometers, Titanium compounds
National Category
Other Mechanical Engineering
Identifiers
URN: urn:nbn:se:bth-18641DOI: 10.1007/s12598-019-01290-7Scopus ID: 2-s2.0-85070801714OAI: oai:DiVA.org:bth-18641DiVA, id: diva2:1350459
Available from: 2019-09-11 Created: 2019-09-11 Last updated: 2019-09-11Bibliographically approved

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