Ni掺杂对Co_(4-x)Ni_xSb_(12)热电转换性能的影响  

Influence of Ni Doping on the Thermoelectric Properties of Co_(4-x)Ni_xSb_(12)

作　　者：赵雪盈[1,2] 史迅[1,2] 陈立东[1] 唐新峰[3] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室 [2]中国科学院研究生院,北京100049 [3]武汉理工大学材料复合新技术国家重点实验室

出　　处：《无机材料学报》2006年第2期392-396,共5页Journal of Inorganic Materials

基　　金：杰出青年科学基金(50325208)国家自然科学基金(50272077)武汉工业大学材料复合新技术重点实验室开放基金(50310353)

摘　　要：采用熔融法合成了Skutterudite化合物Co4-xNixSb12,并研究了Ni掺杂对该化合物的高温热电性能的影响.实验结果表明:由于Ni向Skutterudite结构中提供电子,导致化合物的载流子浓度和电导率随Ni置换量的增加而增加,Seebeck系数为负值,Seebeck系数的峰值温度随Ni置换量的增加向高温方向移动;Ni置换引入了电子-声子散射,导致晶格热导率降低．对于Skutterudite化合物Co4-xNixSb12,得到的最大热电性能指数ZT约为0．55．Skutterudite compound Co4-xNixSb12 was synthesized by the melting method and its thermal and electrical properties were measured in the temperature range of 300-850K. The carrier concentration and electrical conductivity increase with increasing Ni content substituting for Co. The absolute value of Seebeck coefficient decreases and Topt of Seebeck coefficient shifts to a higher temperature with the increase of Ni content. These different transport behaviors in the samples are ascribed to the introduction of extra electrons to the Skutterudite structure by Ni substitution. The lattice thermal conductivity of Co4-xNixSb12 is significantly depressed as compared to that of CoSb3 by introducing extra electron-phonon scattering mode. The maximum ZT value obtained for Co3.92Ni0.08Sb12 at 750K is about 0.55.

关 键 词：Ni掺杂 SKUTTERUDITE 热电性能 

分 类 号：O482[理学—固体物理] TN37[理学—物理]