The effect of rare-earth filling on the lattice thermal conductivity of skutterudites
The effect of rare-earth filling on the lattice thermal conductivity of skutterudites
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DOI：
10.1063/1.361828
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发表时间：
1996-04-15
影响因子：
3.2
通讯作者：
Ehrlich, AC
中科院分区：
文献类型：
--
作者：
Nolas, GS;Slack, GA;Ehrlich, AC
用粉末热等静压法制备了Ir_4LaGe_3Sb_9、Ir_4NdGe_3Sb_9和Ir_4SmGe_3Sb_9多晶样品。这些填充的方钴矿的晶格热导率明显小于IrSb 3;因此，空隙填充显示出作为用于改善这些材料的热电性能的方法的希望。我们提出的晶格热导率，这些填充方钴矿在努力量化的影响，在这种结构中的空隙填充。据信，原子在结构的空隙中“嘎嘎作响”，因此与广泛的晶格声子相互作用，使它们的平均自由程大大低于“未填充”的方钴矿。在Nd ~（3+）和Sm ~（3+）的情况下，4f电子组态的低能级之间的声子激发跃迁引起了另一种声子散射机制。磁化率和霍尔效应的测量。(C)1996年美国物理学会。
Polycrystalline samples of Ir4LaGe3Sb9,Ir4NdGe3Sb9, and Ir4SmGe3Sb9 have been made by hot isostatic pressing of powders. The lattice thermal conductivity of these filled skutterudites is markedly smaller than that of IrSb3; thus, void filling shows promise as a method for improving the thermoelectric properties of these materials. We present the lattice thermal conductivity of these filled skutterudites in an effort to quantify the impact of void filling in this structure. It is believed that the atoms ''rattle'' in the voids of the structure and therefore interact with a broad spectrum of lattice phonons, reducing their mean free paths substantially below that in the ''unfilled'' skutterudites. An additional phonon scattering mechanism is caused by phonon-stimulated transitions between the low-lying energy levels of the 4f electron configurations in the case of Nd3+ and Sm3+. Magnetic susceptibility and Hall-effect measurements are also presented. (C) 1996 American Institute of Physics.