Effect of Off-Stoichiometry on the Thermoelectric Properties of Heusler-Type Fe2VAl Sintered Alloys
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- 作者：M. Mikami ; M. Inukai ; H. Miyazaki ; Y. Nishino
- 关键词：Thermoelectric material ; Heusler alloy ; off ; stoichiometry ; powder metallurgy
- 刊名：Journal of Electronic Materials
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：45
- 期：3
- 页码：1284-1289
- 全文大小：792 KB
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M. Inukai (2)
H. Miyazaki (2)
Y. Nishino (2)
1. National Institute of Advanced Industrial Science and Technology, Nagoya, 463-8560, Japan
2. Nagoya Institute of Technology, Nagoya, 466-8555, Japan - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Optical and Electronic Materials
Characterization and Evaluation Materials
Electronics, Microelectronics and Instrumentation
Solid State Physics and Spectroscopy - 出版者：Springer Boston
- ISSN：1543-186X
文摘
Heusler-type Fe2V1−x Al1+x sintered alloys with micrometer-sized grains were fabricated by the powder metallurgical process using mechanical alloying and pulse-current sintering. Both positive (∼90 μV/K) and negative (∼−140 μV/K) Seebeck coefficients were obtained for the composition ranges of x > 0 and x < 0, respectively, resulting from a Fermi level shift caused by the change in the valence electron concentration. The electrical resistivity was reduced by the carrier doping effect, especially at lower temperatures, resulting in an increased thermoelectric power factor of 2.8 mW/m-K2 for the p-type alloy with x = 0.06 and 5.0 mW/m-K2 for the n-type alloy with x = −0.06. In addition, the lattice thermal conductivity decreased with |x| because of phonon scattering at crystal lattice defects induced by the off-stoichiometry. Consequently, the thermoelectric figure of merit, ZT, was enhanced and reached 0.07 for p-type alloys with 0.06 < x < 0.15 and 0.18 for n-type alloys with −0.15 < x < −0.10 around 500 K. The ZT value was especially enhanced at higher temperatures by the off-stoichiometric composition control, which could extend the range of heat source temperatures for thermoelectric power generation applications using this alloy.