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Special Issue:
SPECIAL TOPIC — Recent advances in thermoelectric materials and devices
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| SPECIAL TOPIC—Recent advances in thermoelectric materials and devices |
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Enhanced thermoelectric performance through homogenously dispersed MnTe nanoparticles in p-type Bi0.52Sb1.48Te3 nanocomposites |
| Tian-Qi Lu(陆天奇)1,2, Peng-Fei Nan(南鹏飞)2, Si-Long Song(宋思龙)1, Xin-Yue Zhu(朱欣悦)3, Huai-Zhou Zhao(赵怀周)2, Yuan Deng(邓元)1 |
1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;
2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3. Electronic Science and Technology, Beijing University of Posts and Telecommunications, Beijing 102101, China |
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Abstract In this work, we report that the thermoelectric properties of Bi0.52Sb1.48Te3 alloy can be enhanced by being composited with MnTe nano particles (NPs) through a combined ball milling and spark plasma sintering (SPS) process. The addition of MnTe into the host can synergistically reduce the lattice thermal conductivity by increasing the interface phonon scattering between Bi0.52Sb1.48Te3 and MnTe NPs, and enhance the electrical transport properties by optimizing the hole concentration through partial Mn2+ acceptor doping on the Bi3+ sites of the host lattice. It is observed that the lattice thermal conductivity decreases with increasing the percentage of MnTe and milling time in a temperature range from 300 K to 500 K, which is consistent with the increasing of interfaces. Meanwhile, the bipolar effect is constrained to high temperatures, which results in the figure of merit zT peak shifting toward higher temperature and broadening the zT curves. The engineering zT is obtained to be 20% higher than that of the pristine sample for the 2-mol% MnTe-added composite at a temperature gradient of 200 K when the cold end temperature is set to be 300 K. This result indicates that the thermoelectric performance of Bi0.52Sb1.48Te3 can be considerably enhanced by being composited with MnTe NPs.
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Received: 18 December 2017
Revised: 25 December 2017
Accepted manuscript online:
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PACS:
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72.20.Pa
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(Thermoelectric and thermomagnetic effects)
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73.50.Lw
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(Thermoelectric effects)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. U1601213 and 51472052) and the Funds from Institute of Physics, Chinese Academy of Sciences. |
Corresponding Authors:
Huai-Zhou Zhao, Yuan Deng
E-mail: Hzhao@iphy.ac.cn;dengyuan@buaa.edu.cn
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Cite this article:
Tian-Qi Lu(陆天奇), Peng-Fei Nan(南鹏飞), Si-Long Song(宋思龙), Xin-Yue Zhu(朱欣悦), Huai-Zhou Zhao(赵怀周), Yuan Deng(邓元) Enhanced thermoelectric performance through homogenously dispersed MnTe nanoparticles in p-type Bi0.52Sb1.48Te3 nanocomposites 2018 Chin. Phys. B 27 047207
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