熔炼-退火法制备La_(0.3)Co_(4-x)Ni_xSb_(12)材料及其热电性能  

Melt-annealing Synthesis and Thermoelectric Properties of Skutterudites La_(0.3)Co_(4-x)Ni_xSb_(12)

作　　者：罗沛兰[1,2] 李克[1] 朱铁军[2] 赵新兵[2] 

机构地区：[1]南昌大学机电工程学院,江西南昌330031 [2]浙江大学硅材料国家重点实验室,浙江杭州310027

出　　处：《材料科学与工程学报》2009年第4期526-529,共4页Journal of Materials Science and Engineering

基　　金：国家973计划资助项目(2007CB607502)

摘　　要：采用熔炼-退火方法制备了La、Ni共掺方钴矿热电材料La0.3Co4-xNixSb12(x=0,0.1,0.5,0.75,1)。研究发现,x≥0.75时,出现NiSb2杂相,这说明当La的填充量为0.3时,Ni的固溶度在0.5到0.75之间。经电学性能测试发现,La0.3Co4-xNixSb12呈n型。随着x值的增大,Seebeck系数绝对值总体呈下降趋势,而电导率和热导率则随着Ni的掺杂量的增加而增加。La0.3Co3.9Ni0.1Sb12功率因子和ZT值分别达到最佳:功率因子σ.α2max=3.97×10-3Wm-1K-2(520K),ZTmax=0.64(773K)。Thermoelectric （TE） materials La0.3Co4-xNixSb12 （x=0, 0. 1, 0. 5, 0. 75, 1） were prepared by meltannealing method. Traces of NiSb2 are coexisted for x ≥ 0.75. It is indicated that the solid solubility limit of Ni in La-filled CoSb3 is between 0.5 and 0.75 when the filling rate of La is 0.3. Transport properties measurements show that all of the La0.3Co4-xNixSb12 samples are n-type. And the absolute values of Seebeck coefficient decrease with increasing the value of x. However, the values of electrical conductivity and thermal conductivity＇increase with the addition of Ni. The maximum value of power factor, σα2 of La0.3Co4-xNixSb12 Skutterudite is 3.97 × 10- Wm 1K-2 at 520K, and the maximum ZT value is 0. 64 at 773K.

关 键 词：热电材料 方钴矿 La填充Ni掺杂CoSb. 熔炼-退火合成 

分 类 号：TN304.2[电子电信—物理电子学] TF124[冶金工程—粉末冶金]