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利用熔融法和等离子放电烧结(SPS)制备单相双原子填充BaxEuyCo4Sb12方钴矿材料并测试其高温热电性能。实验发现,在高填充量下(x+y>40%),材料在高温时具有高的功率因子(>60 W/(cm K2))。在方钴矿的晶格空洞中同时引入Ba和Eu两种填充原子,能增强晶格声子散射,从而大幅降低方钴矿的晶格热导。实验证实,BaxEuyCo4Sb12体系的晶格热导显著降低,其室温晶格热导最低达1.7 W/(m K)。与此对应的是双原子填充BaxEuyCo4Sb12方钴矿材料的热电优值(ZT值)明显增大,其中Ba0.19Eu0.23Co4Sb12的ZT值在850 K时达到了1.3。
Single-phase double-atom-filled BaxEuyCo4Sb12 skutterudite material was prepared by melting method and plasma discharge sintering (SPS), and their high-temperature thermoelectric properties were tested. The experiment found that the material has a high power factor (> 60 W / (cm K2)) at high temperatures at high loadings (x + y> 40%). The introduction of two kinds of Ba and Eu atoms in the lattice vacancies of skutterudite can enhance the lattice phonon scattering and greatly reduce the lattice thermal conductivity of the skutterudite. The experimental results show that the lattice thermal conductivity of BaxEuyCo4Sb12 system is significantly decreased, and the lattice thermal conductivity of BaxEuyCo4Sb12 system is as low as 1.7 W / (m K) at room temperature. Corresponding to this, the thermoelectric figure of merit (ZT) of the double-atom-filled BaxEuyCo4Sb12 skutterudite material increases obviously, and the ZT value of Ba0.19Eu0.23Co4Sb12 reaches 1.3 at 850K.