碲化铋基低维氮化硼纳米复合材料的制备及其热电性能研究  

Preparation and thermoelectric power factor of bismuth telluride based low dimensional boron nitride nanocomposites

作　　者：蒋祥倩 李玲 班春成 李涵 JIANG Xiang-Qian;LI Ling;BAN Chun-Cheng;LI Han(Aerospace Institute,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学航天学院,哈尔滨150001

出　　处：《黑龙江大学工程学报》2021年第3期155-163,共9页Journal of Engineering of Heilongjiang University

基　　金：国家自然科学基金面上项目(62074046);装备预先研究项目(61404140404)。

摘　　要：提出一种新型优化材料热电性能的方法,在高温条件下制备了长径比为50∶1的氮化硼(BN)纳米带材料,并采用球磨法与热压法相结合,制作了不同BN含量的碲化铋(Bi2Te3)/BN复合热电粒子。经测试,掺杂质量比为5∶1的Bi2Te3/BN复合材料,在热压压力2.5 MPa下,输出电压与提供的温差近似呈线性关系。在室温300 K时,塞贝克系数为201.574μV·K^(-1),电阻率为0.006Ω·cm,热导率为0.722 W·(m·K)^(-1),ZT值约为0.678,大于同等实验条件下制备的碲化铋热电粒子。A new method to optimize the thermoelectric properties of materials was proposed.Boron nitride(BN)nanoribbons with aspect ratio of 50∶1 were prepared at high temperature.Bi2Te3/BN composite thermoelectric particles with different BN contents were prepared by ball milling and hot pressing.The results show that the output voltage of Bi2Te3/BN composite with doping mass ratio of 5∶1 is approximately linear with the temperature difference when the hot-pressing pressure is 2.5 MPa.When the temperature difference is 300 K,the seebeck coefficient is 201.574μV·K^(-1),the resistivity is 0.006Ω·cm,the thermal conductivity is 0.722 W·(m·K)^(-1) and the figure of merit can reach 0.678.It is larger than that of Bi2Te3 thermoelectric particles prepared under the same experimental conditions.

关 键 词：氮化硼(BN) 碲化铋(Bi2Te3) 热电效应 塞贝克系数 热导率 热电优值 

分 类 号：TB333[一般工业技术—材料科学与工程]