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利用高压(2～5GPa)固相反应法合成了单相的方钴矿多晶体化合物Co4Sb12-xSex(0≤x≤1.2)。室温下对其电阻率(ρ),Seebeck系数(S)以及微观形貌(SEM)进行了测试分析。结果表明,高压固相反应法合成的样品Co4Sb12-xSex具有细小的晶粒和大量的晶界,晶粒直径处于微纳米级。样品的Seebeck系数绝对值随Se置换浓度(x)而增大,电阻率随Se置换浓度x的升高而显著增大。在合成压强为4.25GPa时,样品Co4Sb10.8Se1.2具有绝对值最大的Seebeck系数501.59μV/K,Co4Sb11.9Se0.1获得最大的功率因子值为3.77μW/cm.K2。
Single-phase cobaltite polycrystalline compound Co4Sb12-xSex (0≤x≤1.2) was synthesized by high pressure (2 ~ 5GPa) solid state reaction. The resistivity (ρ), Seebeck coefficient (S) and microstructure (SEM) were tested at room temperature. The results show that Co4Sb12-xSex synthesized by high-pressure solid-state reaction has fine grains and a large number of grain boundaries, and the grain diameter is on the micro-nano scale. The absolute value of the Seebeck coefficient of the sample increases with the Se substitution concentration (x), and the resistivity increases significantly with the increase of the Se substitution concentration x. At the synthesis pressure of 4.25GPa, the sample Co4Sb10.8Se1.2 has the largest absolute value of Seebeck coefficient of 501.59μV / K, and Co4Sb11.9Se0.1 obtains the maximum power factor of 3.77μW / cm.K2.