固相反应法快速制备纳米结构的CoSb3及其热电性能

Thermoelectric properties of nanostructured CoSb3 fast prepared by solid-state reaction

摘要:

采用固相反应法成功合成了具有纳米结构的p型COSb₃。样品的物相组成和晶体结构采用XRD和SEM进行了表征。在室温下对不同温度和保温时间制备的样品进行了电学性质测试,选择了室温功率因子较好的样品,研究了不同温度下的热电性能。研究结果表明：采用球磨结合固相反法应制备可以制备单相的方钴矿热电材料,所制备的样品内部含有孔径均匀微气孔,晶粒尺寸在纳米范围。当制备温度为863 K时,样品获得最大塞贝克系数222.64 μV/k。当测试温度570 K时,样品获得最大功率因子132.17 μW/(mK^₂)。当样品制备温度903 K时,在600 K时得到最大的热电优值ZT~0.053。本研究为方钴矿热电材料的快速制备提供了一种新的技术途径。

Abstract:

P-type with nanostructured CoSb₃ was successfully synthesized by solid-state reaction method. The phase composition and crystallographic structure were characterized by X-ray diffraction and scanning electron microscopy. The electrical properties of the samples prepared at different temperatures and holding time were tested at room temperature. The samples with better power factor at room temperature were selected to study the thermoelectric properties at different temperatures. The results show that the single phase Skutterudite thermoelectric materials can be prepared by ball milling combined with solid-state reaction. The samples have many micron-size pores uniformly and the grain was in the nanometer range. The maximum Seebeck coefficient was 222.64 μV/k obtained at the prepared temperature of 863 K. The maximum power factor of 132.17 μW/ (mK^₂) at 570 K was obtained and the maximum figure of merit, ZT~0.053 at 600 K was obtained by the sample which prepared temperature of 903 K. This study provides a new technology for the rapid preparation of Skutterudite thermoelectric materials.