Ba填充方钴矿化合物的高压合成及热电性能

无机材料学报, 2010, 25(1): 23-26.

Ba填充方钴矿化合物的高压合成及热电性能

秦丙克 , 李小雷 , 李尚升 , 宿太超 , 马红安 , 贾晓鹏

(1. 河南理工大学材料科学与工程学院, 焦作 454000

2. 2. 吉林大学超硬材料国家重点实验室, 长春 130012)

(1.Institute of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China

2. 2. National Lab of Superhard Materials, Jilin University, Changchun 130012, China)

关键词：热电材料 , Ba-filled , skutterudite , high pressure synthesis

High Pressure Synthesis and Thermoelectric Properties of the Ba-filled Skutterudites

QIN Bing-Ke , LI Xiao-Lei , LI Shang-Sheng , SU Tai-Chao , MA Hong-An , JIA Xiao-Peng

Keywords： thermoelectric materials , 方钴矿 , 钡填充 , 高压合成

利用高压固相反应方法成功合成了Ba填充型方钴矿化合物Ba_xCo₄Sb₁₂(0.2≤x≤0.8), 并探讨了Ba填充及合成压强对化合物电学性能的影响. 采用XRD和SEM确定了相组成和晶体形貌, 并在室温下测试了材料的电阻率及Seebeck系数. 实验结果表明：高压可有助于提高Ba在CoSb₃中的填充含量; 化合物Ba_xCo₄Sb₁₂的晶粒直径处于微纳米级而且样品中含有大量的微气孔; 在合成压强为4.25GPa时, 样品Ba0.8Co4Sb12获得最高的功率因子13.19μW/(cm·K²).

Polycrystalline skutterudite compounds Ba_xCo₄Sb₁₂ (0.2≤x≤0.8) were successfully synthesized by solid state reaction under high pressure (2-5GPa). The crystallographic figures and microstructure were characterized by X-ray diffraction and electron probe microanalysis separately. Seebeck coefficient and electrical resistivity were measured at room temperature. The results show that high-pressure synthesis method can improve the Ba-filled content effectively. The samples have few micro-pores with fine-grai1ned structure, their grain diameter sizes are in the micro-nanometer range. The maximum power factor value of the sample Ba_0.8Co₄Sb₁₂ obtained at 4.25GPa is 13.19μW/(cm·K²).

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