CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Improved thermoelectric performance in p-type Bi0.48Sb1.52Te3 bulk material by adding MnSb2Se4 |
Binglei Cao(曹丙垒)1,2, Jikang Jian(简基康)1, Binghui Ge(葛炳辉)2, Shanming Li(李善明)2, Hao Wang(王浩)2, Jiao Liu(刘骄)1, Huaizhou Zhao(赵怀周)2 |
1. Physics and Optoelectronics Engineering College, Guangdong University of Technology, Guangzhou 510006, China; 2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract Bismuth telluride (Bi2Te3) based alloys, such as p-type Bi0.5Sb1.5Te3, have been leading candidates for near room temperature thermoelectric applications. In this study, Bi0.48Sb1.52Te3 bulk materials with MnSb2Se4 were prepared using high-energy ball milling and spark plasma sintering (SPS) process. The addition of MnSb2Se4 to Bi0.48Sb1.52Te3 increased the hole concentration while slightly decreasing the Seebeck coefficient, thus optimising the electrical transport properties of the bulk material. In addition, the second phases of MnSb2Se4 and Bi0.48Sb1.52Te3 were observed in the Bi0.48Sb1.52Te3 matrix. The nanoparticles in the semi-coherent second phase of MnSb2Se4 behaved as scattering centres for phonons, yielding a reduction in the lattice thermal conductivity. Substantial enhancement of the figure of merit, ZT, has been achieved for Bi0.48Sb1.52Te3 by adding an Mn0.8Cu0.2Sb2Se4 (2 mol%) sample, for a wide range of temperatures, with a peak value of 1.43 at 375 K, corresponding to ~40% improvement over its Bi0.48Sb1.52Te3 counterpart. Such enhancement of the thermoelectric (TE) performance of p-type Bi2Te3 based materials is believed to be advantageous for practical applications.
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Received: 13 September 2016
Revised: 26 October 2016
Accepted manuscript online:
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PACS:
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72.15.Jf
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(Thermoelectric and thermomagnetic effects)
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74.25.fg
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(Thermoelectric effects)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51472052 and Y6J1421A41). |
Corresponding Authors:
Jikang Jian, Huaizhou Zhao
E-mail: jianjikang@126.com;hzhao@iphy.ac.cn
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Cite this article:
Binglei Cao(曹丙垒), Jikang Jian(简基康), Binghui Ge(葛炳辉), Shanming Li(李善明), Hao Wang(王浩), Jiao Liu(刘骄), Huaizhou Zhao(赵怀周) Improved thermoelectric performance in p-type Bi0.48Sb1.52Te3 bulk material by adding MnSb2Se4 2017 Chin. Phys. B 26 017202
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