【摘要】 采用熔融法结合SPS烧结技术合成了SryCo4Sb12-xTex化合物,并探讨了Te掺杂对化合物热电性能的影响.采用XRD及EPMA确定了相组成及化学成分,并测试了材料的高温热电性能.实验结果表明,虽然Te掺杂降低了Sr在CoSb3中的填充量,但是与具有相近Sr填充量的基体相比,Te掺杂提高了材料的载流子浓度和电导率,同时也提高了塞贝克系数;Te掺杂由于引入了电子-声子散射,进一步降低了材料的晶格热导率,并且随着Te掺杂量的增加,晶格热导率的降低幅度提高;对x=0.05的样品Sr0.18Co4Sb11.95Te0.05,在850K时,材料的最大ZT值接近1.0,与具有相近填充量的基体材料相比,ZT值提高了35%.更多还原

【Abstract】 Skutterudite compounds,SryCo4Sb12-xTex,were synthesized by melting method and SPS method,the thermal and electrical properties were measured in the temperature range from 300K to 850K. Both carrier concentration and electrical conductivity of SryCo4Sb12-xTex compounds are higher than those of the matrix with similar Sr filling fraction. The magnitude of Seebeck coefficient is increased in comparison with that of matrix with similar carrier concentration,especially at high temperature. Lattice thermal conductivity is further decreased due to the extra electron-phonon scattering mode introduced by Te doping. The maximum ZT value of 1.0 is obtained for Sr0.18Co4Sb11.95Te0.05 at 850K,which is improved by 35% compared with that of Sr0.17Co4Sb12.更多还原