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Effects of doping Pd/Pt in CoSb3 crystals on electrical and thermoelectric properties

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5 Author(s)
Tashiro, H. ; Toyo Kohan Co. Ltd., Kudamatsu, Japan ; Notohara, Y. ; Sakakibara, T. ; Anno, H.
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Double doping of palladium and platinum is Skutterudite CoSb3 has been studied to improve thermoelectric properties. It was found that the solubility limit of Pd and Pt in CoSb3 crystal amounted to about 10 at% and substitution of Pd and Pt for Co occurred. The carrier concentration increased to about 5×1020 cm -3 due to a higher degree of solutioning of Pd and Pt by double doping than that of Pd or Pt by single doping. Electrical conductivity of σ=1950 S/cm at room temperature could be obtained for the double doping of 5 at% Pd and 5 at% Pt. Heavy doping by Pd and Pi was found to significantly reduce the lattice thermal conductivity, leading to the decrease in thermal conductivity from 0.1 (non-doped crystal) to 0.05 W/cm K. As a result, the figure of merit value Z was about 1.2×10-3/K at temperatures between 500 and 800 K, and the maximum ZT=0.9 was obtained at 750 K

Published in:

Thermoelectrics, 1997. Proceedings ICT '97. XVI International Conference on

Date of Conference:

26-29 Aug 1997