PbTe纳米晶高压热电性能的研究

张向国; 穆鑫; 张增明; 丁泽军

doi:10.11858/gywlxb.2012.02.004

PbTe纳米晶高压热电性能的研究

doi: 10.11858/gywlxb.2012.02.004

1.
中国科学技术大学物理系及合肥微尺度国家实验室，安徽合肥 230026；
2.
中国科学技术大学物理实验中心，安徽合肥 230026

详细信息

通讯作者:
张增明 E-mail:zzm@ustc.edu.cn

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出版历程
- 收稿日期: 2010-09-30
- 修回日期: 2011-05-26
- 发布日期: 2012-04-15

Thermoelectric Properties of Nanoparticle PbTe under Hydrostatic Pressure

1.
National Laboratory for Physical Sciences at Microscaleand Department of Physics, University of Science and Technology of China, Hefei 230026, China;
2.
The Centre of Physical Experiments, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China

摘要

摘要: 利用自建的400 t四柱双缸液压机，研究了PbTe纳米晶在0~0.8 GPa压力范围内热电性能随压力的变化。实验结果表明：PbTe纳米晶电导率随压力的增加而增加，而热电动势随压力的增加而减小，两者随压力的变化具有可逆性；PbTe纳米晶具有极高的热电动势，在常压下达到565 V/K，在0.8 GPa压力下，材料的电导率为常压下的4倍，热电动势仅降低20%，功率因子则达到常压下的3倍。研究表明，高压能显著提高PbTe纳米晶的热电性能。利用第一性原理计算了0.4~4.0 GPa压力范围内材料的简约费米能级，计算结果与实验结果相吻合。
- 高压 /
- PbTe /
- 热电性能 /
- 纳米晶 /
- 第一性原理
Abstract: The thermoelectric properties of PbTe nanoparticles were studied from ambient pressure to 0.8 GPa by using self-built set-up. The electrical conductivity increased while Seebeck coefficient decreased with loading pressure and these properties can be recovered after pressure released. Moreover, Seebeck coefficient is extremely high, up to 565 V/K at ambient pressure. At 0.8 GPa, the electrical conductivity enhances four times, the power factor adds three times and Seebeck coefficient is only reduced by 20% comparing with those at ambient pressure. These results indicate that high pressure can improve the thermoelectric properties of PbTe nanoparticle. The contracted Femi-energy is also calculated based on the First Principle under high pressure from 0.4 to 4.0 GPa. The calculated values agree well with experimental data.
- high pressure /
- PbTe /
- thermoelectric properties /
- nanocrystalline /
- First Principle

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