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Volume 40 Issue 1
Feb.  2022
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WANG Xiao-yu, JIANG Wei, ZHU Bing, SUN Yuan-tao, XIANG Bo, HUANG Zhong-yue, YANG Shuang-gen, ZU Fang-qiu. Effect of SiC on thermoelectric properties of P-type Bi0.5Sb1.5Te3 alloy prepared by pulverizing and sintering method[J]. Powder Metallurgy Technology, 2022, 40(1): 53-59. DOI: 10.19591/j.cnki.cn11-1974/tf.2020010008
Citation: WANG Xiao-yu, JIANG Wei, ZHU Bing, SUN Yuan-tao, XIANG Bo, HUANG Zhong-yue, YANG Shuang-gen, ZU Fang-qiu. Effect of SiC on thermoelectric properties of P-type Bi0.5Sb1.5Te3 alloy prepared by pulverizing and sintering method[J]. Powder Metallurgy Technology, 2022, 40(1): 53-59. DOI: 10.19591/j.cnki.cn11-1974/tf.2020010008
shu

Effect of SiC on thermoelectric properties of P-type Bi0.5Sb1.5Te3 alloy prepared by pulverizing and sintering method

  • 1.

    38th Research Institute, China Electronic Technology Group Corporation, Hefei 230088, China

  • 2.

    School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China

  • 3.

    College of Science, Southern University of Science and Technology, Shenzhen 518055, China

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    • Abstract
  • SiC particles in the different volume fraction were mixed into Bi0.5Sb1.5Te3+5%Te alloy powders (mass fraction) prepared by the pulverizing method. The mixed powders were sintered into the blocks by spark plasma sintering (SPS) method. The microstructure and thermoelectric properties of these block samples were investigated. The results show that, with the increase of SiC volume fraction, the orientation of the bulks is weakened, the microstructure is refined, the carrier concentration increases, and the mobility decreases. Due to the weakened orientation and the refined microstructure, the scattering of phonons is enhanced, leading to a reduced lattice thermal conductivity. However, due to the deterioration of the electrical properties for the blocks, the dimensionless thermoelectric value (ZT) of the bulks with SiC has no improvement. When the volume fraction of SiC is 0.40%, the block samples show the best thermoelectric performance with ZT = ~0.81 at 322 K.
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