Enhancing Thermoelectric Properties of Higher Manganese Silicide (HMS) by Partial Ta Substitution

被引:8
|
作者
Parse, Nuttawat [1 ,2 ]
Tanusilp, Sora-At [3 ]
Silpawilawan, Wanthana [3 ]
Kurosaki, Ken [3 ,4 ,5 ]
Pinitsoontorn, Supree [1 ,2 ]
机构
[1] Khon Kaen Univ, Dept Phys, Fac Sci, Khon Kaen 40002, Thailand
[2] Khon Kaen Univ, Inst Nanomat Res & Innovat Energy IN RIE, NANOTEC KKU RNN Nanomat Res & Innovat Energy, Khon Kaen 40002, Thailand
[3] Osaka Univ, Grad Sch Engn, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan
[4] Univ Fukui, Res Inst Nucl Engn, 1-3-33 Kanawa Cho, Tsuruga, Fukui 9140055, Japan
[5] Kyoto Univ, Inst Integrated Radiat & Nucl Sci, 2 Asashiro Nishi, Kumatori, Osaka 5900494, Japan
关键词
Thermoelectric; higher manganese silicide; Ta doping; melt spinning; spark plasma sintering; CRYSTAL-STRUCTURE; FE; PHASE; BULK; MN;
D O I
10.1007/s11664-019-07673-x
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this work, the thermoelectric properties of the p-type higher manganese silicide (HMS) were enhanced by partially substituting Mn with Ta. The ingots of the compound Mn36.4-xTaxSi63.6, where x=0.00, 0.25, 0.50. 0.75 and 1.00, were synthesized via arc melting which were then cast into a ribbon shape by a melt spinning process. After that, the crushed ribbons were consolidated to form a bulk sample by spark plasma sintering. The x-ray diffraction analysis showed that the single phase of HMS existed for x up to 0.50. Above that, the evidence of secondary phases was found, confirmed by scanning electron microscope imaging with elemental mapping. For thermoelectric properties measurement, the Seebeck coefficient and electrical conductivity were insignificantly different in the pure-phase samples. On the other hand, the samples with secondary phases showed increased electrical conductivities but slightly decreased Seebeck coefficients. The thermal conductivity was suppressed in all Ta-substituted samples. The lowest lattice thermal conductivity was found in the sample with the impurity phase (TaSi2) due to the enhanced phonon scattering. Consequently, the ZT of the Ta-substituted HMS was enhanced with the peak ZT of 0.37 at 813 K, which is about 28% higher than that of the pristine HMS.
引用
收藏
页码:2726 / 2733
页数:8
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