Abstract
Previously, we synthesized I-filled CoSb3 using a high-pressure synthesis (HPS) technique. This p-type skutterudite possessed an extraordinary low thermal conductivity but inferior power factor, thereby resulting in a fair thermoelectric performance. In this work, Fe atoms were introduced into the system to substitute Co atoms. The successful filling of I anions in FexCo4−xSb12 polycrystals was verified using X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and specific heat measurements. Thermoelectric property investigation shows greatly enhanced electrical transport properties and slightly increased thermal conductivity with Fe substitution. Given the benefits caused by these factors, ZT for IFe0.7Co3.3Sb12 was enhanced more than 100% compared with those of previous ICo4Sb12 or I-free Fe0.65Co3.35Sb12.
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