Sm和Ce复合掺杂Skutterudite化合物的制备及热电性能

用熔融法结合放电等离子快速烧结(SPS)制备出了单相的Sm和Ce复合掺杂的Skutterudite化合物Sm_mCe_nFe_1.5Co_2.5Sb₁₂，研究了Sm和Ce复合掺杂总量对其热电性能的影响规律.结果表明：随着Sm和Ce复合掺杂总量的增加，p型Sm_mCe_nFe_1.5Co_2.5Sb₁₂化合物的Seebeck系数增加、电导率和热导率降低.当掺杂总量相近时，和Sm、Ce单原子掺杂相比，Sm和Ce复合掺杂使Skutterudite化合物的热导率低10%—40%.Sm_0.22Ce_0.20Fe_1.54Co_2.46Sb_11.89化合物的最大热电性能指数ZT_max值在775K时为0.84. 关键词： 复合掺杂 方钴矿 热电性能

Synthesis and thermoelectric properties of the Sm and Ce multiple doping skutterudites

Multiple-doped skutterudites SmmCenFe1.5Co2.5Sb12 were prepared by melting and spark plasma sintering method, and the effects of doping atoms Sm and Ce on the thermoelectric properties of these compounds were investigated. For p-type SmmCenFe1.5Co2.5Sb12, with the Sm and Ce multiple-doping amount increasing, the electrical conductivity and the thermal conductivity decrease and the Seebeck coefficient increases. When the doping amount is similar, in comparison with the Sm or Ce doping, the Sm and Ce multiple-doping can lower the thermal conductivity of skutterudites 10%--40%. At 775K, the ZTmax value of 0.84 was obtained for Sm0.22Ce0.20Fe154 Co2.46Sb11.89.