Zhang Qiang, Wu Gang, Guo Zhe, Sun Peng, Wang Ruoyu, Chen Lidong, Wang Xuemei, Tan Xiaojian, Hu Haoyang, Yu Bo, Noudem Jacques G, Liu Guoqiang, Jiang Jun
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
ACS Appl Mater Interfaces. 2021 Jun 2;13(21):24937-24944. doi: 10.1021/acsami.1c05525. Epub 2021 May 20.
Bismuth telluride alloys have dominated the industrial application of thermoelectric cooling, but the relatively poor mechanical performance of commercial zone-melting material seriously limits the device integration and stability. Here, we exhibit synergistically enhanced thermoelectric and mechanical performances of sintered BiSbTe-AgSbSe composites. It is found that the increased hole concentration improves the σ to 40 μW cm K at room temperature, and the emerged various defects effectively suppress the to 0.57 W m K at 350 K. All effects harvest a highest = 1.2 at 350 K along with an average = 1.0 between 300-500 K in the = 0.2 sample. Notably, AgSbSe addition not only optimizes the thermoelectric properties, but also enhances the mechanical performance with a Vickers hardness of 0.75 GPa. Furthermore, the isotropy of thermoelectric properties is also observably promoted by solid-phase reaction combined with high-energy ball milling and hot pressing. Our study reveals a viable strategy to improve the comprehensive performance of sintered bismuth telluride materials.
碲化铋合金在热电冷却的工业应用中占据主导地位，但商业区域熔炼材料相对较差的机械性能严重限制了器件集成和稳定性。在此，我们展示了烧结BiSbTe-AgSbSe复合材料协同增强的热电和机械性能。研究发现，空穴浓度的增加将室温下的电导率提高到40 μW cm K，并且出现的各种缺陷在350 K时有效地将热导率抑制到0.57 W m K。所有这些效应在350 K时收获了最高的ZT = 1.2，在ZT = 0.2的样品中300 - 500 K之间的平均ZT = 1.0。值得注意的是，添加AgSbSe不仅优化了热电性能，还将维氏硬度提高到0.75 GPa从而增强了机械性能。此外，通过固相反应结合高能球磨和热压，热电性能的各向同性也得到了显著提升。我们的研究揭示了一种提高烧结碲化铋材料综合性能的可行策略。
