Bi_(0.90)Sb_(0.10)热电材料高压制备及性能研究  

High-press preparation and thermoelectric properties of Bi_(0.90)Sb_(0.10)

作　　者：宋春梅[1] 刘华军[1] 吴云龙[1] 教晓冬[1] 黄荣进[1] 王宏[1] 李来风[1] 

机构地区：[1]中国科学院理化技术研究所

出　　处：《低温工程》2005年第6期20-23,共4页Cryogenics

基　　金：贵州省科技基金(20052088)支持项目;中国科学院海外杰出青年基金(2005-2-5)

摘　　要：通过机械球磨法获得B i0.90Sb0.10纳米晶粉末材料,常温下冷压成型,再分别在不同温度(373 K,473 K,573 K)下进行高压。通过X射线衍射实验分析表明B i0.90Sb0.10合金样品单相形成。分别测量了样品的Seebeck系数、热导率、电导率在80 K^300 K温区的变化情况,并与单晶样品进行比较,结果表明:通过高压制备的样品的电导率和热导率比单晶样品小,Seebeck系数在130 K附近出现明显的峰值。其中,在573 K下高压的样品在130 K时Seebeck系数出现最大值120.3μV/K,优值参数在140 K时为0.90×10-3K-1。Nano crystallite Bi0.90Sb0.10 powders were prepared by mechanical alloying. The powders were pressed into pellets and then pressed to form bulk samples under high pressure of 6 GPa at different pressing temperatures （373 K, 473 K and 573 K）. The X-ray diffraction analysis indicated that the single phase was formed. Electrical conductivity, Seebeck coefficient and thermal conductivity were all measured at the temperature range of 80 K-300 K. The electrical conductivity and thermal conductivity were lower than that of single crystal because of boundary scattering. The Seebeck coefficients had a maximum value 120.3μV/K at about 130 K. The largest figure-of-merit was 0.90×10^-3K^-1 at 140 K.

关 键 词：热电材料 高压 优值参数 

分 类 号：TB663[一般工业技术—制冷工程]