Abstract
The high-temperature thermoelectric properties of thallium (Tl) and potassium (K) double-filled cobalt antimonide (CoSb3)-based skutterudites with nominal compositions TlxK0.3Co4Sb12 (x = 0.1 − 0.3) were investigated. The filling fraction of Tl in CoSb3 was enhanced by co-filling with K, which resulted in all of the samples showing the filled-skutterudite single phase. Owing to the high filling ratio, the carrier concentration in the sample with x = 0.3 was as high as 4.3 × 1020 cm−3 at room temperature. Furthermore, quite low lattice thermal conductivity (as low as 0.9 Wm−1K−1) was obtained for the sample with x = 0.3, probably because of strong phonon scattering by the Tl and K co-rattling effect, which resulted in a maximum zT of around one at 773 K.
Highlights
Thermoelectric (TE) materials can be used for direct energy conversion from waste heat into electrical power, and have advantages of no moving parts and high reliability
Conflict of Interest Statement: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest
The maximum zT of around one was obtained at 773 K for the samples with nominal compositions Tl0.3K0.3Co4Sb12 and Tl0.2K0.3Co4Sb12
Summary
Thermoelectric (TE) materials can be used for direct energy conversion from waste heat into electrical power, and have advantages of no moving parts and high reliability. C., Stiewe, C., Karpinski, G., Hassdorf, R., and Müller, E. “Thermoelectric properties of CoSb3 and In0.5CoSb3 skutterudite materials,” in Proceedings of the 6th European Conference on Thermoelectrics (ECT) (Paris). P., Chen, B., Hu, S., and Uher, C.
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