cm052055b_si_001.cif (22.21 kB)

Thermoelectric Properties of Indium-Filled Skutterudites

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posted on 07.02.2006 by Tao He, Jiazhong Chen, H. David Rosenfeld, M. A. Subramanian
Structural, electrical, and thermal transport properties of CoSb3 partially filled with indium are reported. Polycrystalline samples of InxCo4Sb12 (0 ≤ x ≤ 0.3) were prepared by solid-state reaction under a gas mixture of 5% H2 and 95% Ar. The solubility limit of the indium filling voids in CoSb3 was found to be close to 0.22. Synchrotron X-ray diffraction refinement of the x = 0.2 sample showed that the indium is located in the classic rattler site and has a substantially larger thermal factor than those of Co and Sb. The electrical resistivity, Seebeck coefficients, and thermal conductivity of the InxCo4Sb12 samples were measured in the temperature range of 300−600 K. All samples showed metal-like behavior, and the large negative Seebeck coefficients indicated n-type conduction. The thermal conductivity decreased with increasing temperature for all samples. A thermoelectric figure-of-merit (ZT) ≥ 1 (n-type) has been achieved when x ≥ 0.2 in InxCo4Sb12 at 575 K.

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