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Co₄Sb_12-xSe_x的高温高压合成及电学输运性能研究

Transport properties study of Co₄Sb_12-xSe_x prepared by high pressure and high temperature

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【作者】秦丙克；李尚升；李小雷；宿太超；马红安；陈孝洲；姜一平；邓乐；柳洋；任国仲；贾晓鹏；

【Author】 QIN Bing-ke1,LI Shang-sheng1,LI Xiao-lei1,SU Tai-chao2,MA Hong-an2,CHEN Xiao-zhou1,JIANG Yi-ping2,DENG Le2,LIU Yang3,REN Guo-zhong3,JIA Xiao-peng1,2(1.Institute of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;2.National Lab.of Superhard Materials,Jilin University,Changchun 130012,China;3.Faculty of Materials,Optoelectronics and Physics,Xiangtan University,Xiangtan 411105,China)

【机构】河南理工大学材料科学与工程学院；吉林大学超硬材料国家重点实验室；湘潭大学材料与光电物理学院；

【摘要】利用高压(2～5GPa)固相反应法合成了单相的方钴矿多晶体化合物Co4Sb12-xSex(0≤x≤1.2)。室温下对其电阻率(ρ),Seebeck系数(S)以及微观形貌(SEM)进行了测试分析。结果表明,高压固相反应法合成的样品Co4Sb12-xSex具有细小的晶粒和大量的晶界,晶粒直径处于微纳米级。样品的Seebeck系数绝对值随Se置换浓度(x)而增大,电阻率随Se置换浓度x的升高而显著增大。在合成压强为4.25GPa时,样品Co4Sb10.8Se1.2具有绝对值最大的Seebeck系数501.59μV/K,Co4Sb11.9Se0.1获得最大的功率因子值为3.77μW/cm.K2。更多还原

【Abstract】 Polycrystalline Skutterudite compounds Co₄Sb_12-xSe_x（0≤x≤1.2） were synthesized successfully by solid state reaction under high pressure（2-5GPa） and high temperature（HPHT）.The crystallographic properties were characterized by X-ray diffraction and electron probe microanalysis,The Seebeck coefficient,electrical resistivity were measured at room temperature.The results show that HPHT synthesized samples Co₄Sb_12-xSe_x have fine grains and large of grain boundaries.The grain sizes are about in the range of micro-nanometer.The Seebeck coefficient and electrical resistivity of Co₄Sb_12-xSe_x increase with the increase of the content of Se（x）.The maximum absolute Seebeck coefficient 501.59μV/K was obtained for the sample Co4Sb10.8Se1.2 synthesized at 4.25GPa.Under the same pressure,the maximum power factor 3.77μW/cm·K2 was obtained for the sample Co4Sb11.9Se0.1.更多还原