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用两步固相反应法合成了p型Ba填充方钴矿化合物Ba0 .3FeCo3Sb1 2 ,并采用放电等离子烧结法 (SPS)制备了Ba0 .3FeCo3Sb1 2 /多壁碳纳米管复合材料 .研究了Ba0 .3FeCo3Sb1 2 /多壁碳纳米管复合材料的结构及多壁碳纳米管对其热电性能的影响规律 :SEM分析表明多壁碳纳米管比较均匀地分布在Ba0 .3FeCo3Sb1 2 基体中 ;随着碳纳米管添加量的增加 ,Ba0 .3FeCo3Sb1 2 多壁碳纳米管复合材料的电导率下降、塞贝克系数略微下降、晶格热导率大幅度降低 ,当碳纳米管含量为 5 %时其晶格热导率最小 ;当碳纳米管的含量为 3%时 ,本研究得到的Ba0 .3FeCo3Sb1 2 碳纳米管复合材料的最大ZT值达 0 . 78.
Ba0.3FeCo3Sb1 2 was synthesized by a two-step solid-state reaction method and Ba0.3FeCo3Sb1 2 / multi-walled carbon nanotube composites were prepared by spark plasma sintering (SPS) method. The structure of 3FeCo3Sb1 2 / multi-walled carbon nanotubes composites and the effect of multi-walled carbon nanotubes on their thermoelectric properties: SEM analysis shows that the multi-walled carbon nanotubes are relatively uniformly distributed in the Ba0.3FeCo3Sb1 2 matrix; The electrical conductivity of Ba0.3FeCo3Sb1 2 multi-walled carbon nanotube composites decreased with the increase of the amount of the tube. The Seebeck coefficient decreased slightly and the lattice thermal conductivity decreased significantly. When the content of carbon nanotubes was 5%, the lattice heat When the content of carbon nanotubes is 3%, the maximum ZT value of Ba0.3FeCo3Sb12 carbon nanotubes composites obtained in this study is 0.78.