固相反应温度对铜碲掺杂方钴矿电学性质的影响  

Influence of preparation temperature on electrical properties of Cu,Te doped Skutterudite synthesized by solid state reaction

作　　者：马飞 宋庆平 谯文凤 郭远明 秦丙克 MaFei;SongQingping;QiaoWenfeng;GuoYuanming;QinBingke(School of Chemistry and Materials Engineering,Liupanshui Normal University,Guizhou Liupanshui 553004)

机构地区：[1]六盘水师范学院化学与材料工程学院,贵州六盘水553004

出　　处：《云南化工》2020年第8期43-45,共3页Yunnan Chemical Technology

基　　金：国家级大学生创新创业训练计划项目(2018520976),(20195200414);六盘水师范学院大学生创新创业项目(2019089);六盘水师范学院校级基金项目(LPSSYKYJJ201902);六盘水师范学院科技创新团队项目(LPSSYKJTD201905);六盘水师范学院教学内容与课程体系改革项目(LPSSYjg201811)。

摘　　要：采用固相反应法在制备温度763~923 K、保温时间~30 min的条件下,快速合成了方钴矿型多晶体化合物CuxCo4 Sb11.7Te0.3(0≤x≤0.4)。采用X射线衍射仪(XRD)测试分析了样品的相组成,通过扫面电子显微镜对样品进行了微观结构测试,并研究了不同样品在室温附近的电学性质。结果表明:所制备的样品均为单相的方钴矿结构,样品内部含有许多微孔,样品的晶粒直径在纳米级。随着制备温度的升高样品的Seebeck系数绝对值增大,而其电阻率降低导致功率因子随制备温度的升高而显著增大。当制备温度773 K时样品Cu0.2Co4 Sb11.7Te0.3在室温附近获得最大绝对值的Seebeck系数172.16μV/K,当制备温度923 K,样品Cu0.1 Co4 Sb11.7 Te0.3在室温附近获得最低电阻率2.07 mΩ·cm,并在此条件下获得最大的功率因子为1263.43μW·m^-1K^-2。The polycrystalline compounds CuxCo4 Sb11.7Te0.3(0≤x≤0.4)of Skutterudite type was rapidly synthesized by solid-state reaction at 763-923 K and holding time^30 min.The phase composition of the samples was analyzed by X-ray diffractometer(XRD).The microstructure of the samples was tested by SEM,and the electrical properties of different samples near room temperature were studied.The experimental results show that the samples are all single-phase skutterudite structure,there are many micropores in the samples,and the grain diameter of the samples is in the nanometer level.The absolute value of Seebeck coefficient increases with the increase of preparation temperature,while the decrease of resistivity leads to the increase of power factor with the increase of preparation temperature.The Seebeck coefficient of the maximum absolute value of Cu0.2Co4Sb11.7 Te0.3 is 172.16μV/K when the preparation temperature is 773 K,and the minimum resistivity of Cu0.1Co4Sb11.7Te0.3 is 2.07 mΩ·cm when the preparation temperature is 923 K,under which the maximum power factor is 1263.43μW·m^-1K^-2.

关 键 词：热电材料 CoSb3 固相反应 微观结构 

分 类 号：TN304[电子电信—物理电子学] TG146.4[一般工业技术—材料科学与工程]