采用熔融法制备了P型填充式方钴矿化合物Yb_yFe_xCo_(4-x)Sb_(12),并研究了Co位Fe掺杂对该化合物热电传输特性的影响.在300～850 K的温度范围内,测试了化合物的电导率、赛贝克系数和热导率.结果表明,化合物的主要相组成为Yb_yFe_xCo_(4-x)Sb_(12),EPMA结果显示化合物中含有微量FeSb_2和CoSb_2杂质相.化合物的赛贝克系数均为正值,表明为p型半导体.随着Fe掺杂量的增加,化合物的电导率增加,晶格热导率降低,最小室温晶格热导率仅为1.33 W·m~(-1)K~(-1),对于化合物Yb_0.29Fe_1.2Co_2.8Sb_(12),在800 K时获得最大热电优值ZT约为0.67.
Filled skutterudite compounds Yb_yFe_xCo_(4-x)Sb_(12) (x=0.8～1.5, y=0.35) were synthesized by melting method. The constituent phases and chemical composition of the samples were determined by X-ray diffraction (XRD) and electron probe microanalysis(EPMA). Effects of Fe content on the thermoelectric transport properties of Yb_yFe_xCo_(4-x)Sb_(12) compounds were investigated. All samples showed p-type conduction. All the samples contain Yb_yFe_xCo_(4-x)Sb_(12) skutterudite as the main phase with a trace amount of FeSb_2 and CoSb_2 impurities. Experimental results show that electrical conductivity of the samples increases with increasing iron content due to the vacancy point defect scattering at Co site introduced by iron. The lowest lattice thermal conductivity at room temperature is about 1.33 W·m~(-1)K~(-1). The highest ZT value is 0.67 forYb_yFe_xCo_(4-x)Sb_(12) at 800 K.
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