熔融旋甩制备Ce_(0.8)Fe_(4-x)Ni_xSb_(12)方钴矿的热电性能研究  

Thermoelectric properties of Ce_(0.8)Fe_(4-x)Ni_xSb_(12) compounds prepared by MS+SPS technique

作　　者：谭刚健[1] 鄢永高[1] 李涵[1] 苏贤礼[1] 唐新峰[1] 

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,湖北武汉430070

出　　处：《功能材料》2011年第5期914-917,共4页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)资助项目(2007CB607501);国家自然科学基金重点资助项目(50731006)

摘　　要：采用熔融旋甩(MS)技术结合放电等离子烧结(SPS)工艺制备了方钴矿化合物Ce0.8Fe4-xNixSb12(x=0～0.15),并对样品进行了相组成及微观结构分析和热电性能表征。研究结果表明,所有样品均为单相且呈P型传导。Ni对Fe进行取代后,电导率有一定程度下降,但Seebeck系数得到显著提高。然而由于Ni取代同时导致了载流子热导的降低以及合金化散射引起晶格热导率减小而使其总热导率大幅度下降。其中,x=0.05和x=0.10样品在800K时最大无量纲热电优值均达到0.73,相比于参比样Ce0.8Fe4Sb12提高了约18%。Single-phase skutterudite compounds with highly relative density Ce0.8 Fe4-x NixSb12 （x= 0-0.15） were prepared by combining melt spinning technique with spark plasma sintering. Their phase structure, microstructure and thermoelectric properties were investigated. The result reveals that all samples show p-type conduc- tion. When Fe was substituted by Ni, the electrical properties can be reduced to some extent, but the total thermal conductivity is decreased more evidently due to the reduction of ke caused by decreased carrier concentration and kL caused by alloying scattering. The maximum ZT value of about 0.73 is obtained at 800K for the x= 0. 05 and x=0. 10 samples, which was 18% higher than that of x=0 sample.

关 键 词：熔融旋甩 方钴矿 热导率 热电性能 

分 类 号：O482.6[理学—固体物理]