Co_4Sb_(12-x)Se_x的高温高压合成及电学输运性能研究  

Transport properties study of Co_4Sb_(12-x)Se_x prepared by high pressure and high temperature

作　　者：秦丙克[1] 李尚升[1] 李小雷[1] 宿太超[2] 马红安[2] 陈孝洲[1] 姜一平[2] 邓乐[2] 柳洋[3] 任国仲[3] 贾晓鹏[1,2] 

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454000 [2]吉林大学超硬材料国家重点实验室,吉林长春130012 [3]湘潭大学材料与光电物理学院,湖南湘潭411105

出　　处：《功能材料》2009年第10期1675-1677,共3页Journal of Functional Materials

基　　金：国家自然科学基金重点资助项目(50731006);国家青年自然基金资助项目(50801030)

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。Polycrystalline Skutterudite compounds Co4Sb12-xSex（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 Co4Sb12-xSex. 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 Co4Sb12-xSex increase with the increase of the content of Se （x）. The maximum absolute Seebeck coefficient 501.59μV/K was obtained for the sample Co4Sb10.8Se0.1 synthesized at 4.25GPa. Under the same pressure, the maximum power factor 3.77μW/cm · K^2 was obtained for the sample Co4Sb11.9Se0.1.

关 键 词：方钴矿 热电材料 载流子浓度 晶体结构 高温高压 

分 类 号：O047[理学] TN304[电子电信—物理电子学]