Ni掺杂对Co4-xNixSb12热电转换性能的影响

无机材料学报, 2006, 21(2): 392-396. doi: 10.3724/SP.J.1077.2006.00392

Ni掺杂对Co_4-xNi_xSb₁₂热电转换性能的影响

1.1. 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, 上海 200050

2. 2. 中国科学院研究生院, 北京 100049

3. 3. 武汉理工大学材料复合新技术国家重点实验室, 武汉 430070

1.1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, CAS, Shanghai 200050, China

2.2. Graduate School of Chinese Academy of Sciences, Beijing 100049, China

3. 3. The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

关键词： Ni掺杂 , skutterudite , thermoelectric transport properties

Influence of Ni Doping on the Thermoelectric Properties of Co_4-xNi_xSb₁₂

ZHAO Xue-Ying , SHI Xun , CHEN Li-Dong , TANG Xin-Feng

Keywords： Ni doping , Skutterudite , 热电性能

采用熔融法合成了Skutterudite化合物Co_4-xNi_xSb₁₂, 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Co_4-xNi_xSb₁₂, 得到的最大热电性能指数ZT约为0.55.

Skutterudite compound Co_4-xNi_xSb₁₂was 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 T opt 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 Co_4-xNi_xSb₁₂is significantly depressed as compared to that of CoSb₃ by introducing extra electron-phonon scattering mode. The maximum ZT value obtained for Co_3.92Ni_0.08Sb₁₂ at 750K is about 0.55.

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