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选用高纯的Bi粉、Se粉、Cu粉、CuO、CaO、NiO作为原材料,采用固相结合放电等离子烧结制备不同成分的样品,测试了不同成分样品从室温RT到823 K不同温度下热电传输性能。研究结果表明,通过在Bi位掺杂Ca、Cu位掺杂Ni,可以有效的调控材料的热电性能。Bi0.94Ca0.06Cu0.94Ni0.06Se O在823 K时,电导率达到最高值5300 S·m-1,远高于BiCuSeO的电导率1100 S·m-1。同时,样品具有较低的热导率(0.9~0.4 W·m-1·K-1)和较高的Seebeck系数(200~250μV·K-1)。Ca、Ni双掺BiCuSeO体系中Bi0.94Ca0.06Cu0.94Ni0.06Se O的热电优值(ZT)在823 K时达到最大值0.55。
Separation of high purity Bi, Se, Cu, CuO, CaO and NiO was carried out by solid state combined with spark plasma sintering. The samples with different compositions were tested for their thermoelectricity at different temperatures from RT to 823 K performance. The results show that the thermoelectric properties of the material can be effectively controlled by doping Ca and Cu at the Bi sites. The conductivity of Bi0.94Ca0.06Cu0.94Ni0.06Se O reached the maximum of 5300 S · m-1 at 823 K, much higher than that of BiCuSeO at 1100 S · m-1. Meanwhile, the samples have lower thermal conductivity (0.9-0.4 W · m-1 · K-1) and higher Seebeck coefficient (200-250 μV · K-1). The thermoelectric figure of merit (ZT) of Bi0.94Ca0.06Cu0.94Ni0.06Se O in the double-doped BiCuSeO system reaches the maximum of 0.55 at 823K.