Ca和Sm双原子共填充方钴矿化合物的制备及热电性能  

Synthesis and Thermoelectric Properties of the Ca and Sm Co-filled Skutterudites

作　　者：刘桃香[1] 唐新峰[1] 邓书康[1] 宋晨[1] 张清杰[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,武汉430070

出　　处：《无机材料学报》2008年第4期710-714,共5页Journal of Inorganic Materials

基　　金：国家重点基础研究发展规划(973)项目(2007CB607501);国家自然科学基金(50572082)

摘　　要：用熔融法结合放电等离子快速烧结技术(SPS)制备了单相的Ca和Sm共填充的方钴矿化合物Ca_mSm_nFe_xCo_(4-x)Sb_(12),研究了两种原子共填充总量及填充分量对其热电性能的影响规律.结果表明:随着Ca和Sm双原子共填充总量的增加,p型Ca_mSm_nFe_xCo_(4-x)Sb_(12)化合物的Seebeck系数增大、电导率和热导率降低.当共填充总量相近时,Ca原子填充分量较大的方钴矿化合物。其电性能较好;而Sm原子填充分量较大的方钴矿化合物,其热导率较低、Seebeck系数较高.Ca_(0.15)Sm_(0.24)Fe_(1.51)Co_(2.48)Sb_(12)化合物的最大热电性能指数ZT_(max)值在775K时为0.85.Co-filled skutterudites CamSmnFexCo4-xSb12 were prepared by melting method and spark plasma sintering （SPS） technique, and the effects of filling amount and fraction of Ca and Sm on the thermoelectric properties of these compounds were investigated. For p-type CamSmnFexCo4-xSb12, with the Ca and Sm co-filling amount increasing, the Seebeck coefficient increases, but the electrical conductivity and the thermal conductivity decrease. When the Ca and Sm co-filling amount is fixed, the electrical conductivity of skutterudites increases with increasing Ca filling fraction, the thermal conductivity decreases and the Seebeck coefficient increases with the increase of Sm filling fraction. At 775K, the highest figure of merit value of 0.85 is obtained for Ca0.15Sm0.24Fe1.51Co2.48Sb12.

关 键 词：共填充 方钴矿 热电性能 

分 类 号：TN304[电子电信—物理电子学] TN337