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Transport properties on Sn-filled and Te-doped CoSb3 skutterudites

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Abstract

Sn-filled and Te-doped CoSb3 skutterudites (SnxCo8Sb23.25Te0.75) were synthesized by the encapsulated induction melting process. Single δ-phase was successfully obtained by subsequent heat treatment at 823 K for 6 days. Structural characterizations were carried out through X-ray diffraction studies. Transport properties such as the Seebeck coefficient, electrical resistivity, thermal conductivity, carrier concentration and mobility were measured and analyzed. The unfilled Co8Sb23.25Te0.75 sample showed n-type conductivity from 300 K to 700K. However, the Sn-filled SnxCo8Sb23.25Te0.75 showed n-type conductivity for z=0.25 and 0.5, and p-type conductivity for z=1.0 and 1.5 from 300 K to 700 K. Thermal conductivity was reduced by the impurity-phonon scattering. The dimensionless figure of merit (ZT) was remarkably improved over that of untreated CoSb3. However, the ZT value decreased when filling with z≥1.0 because the conductivity type was changed from n-type to p-type, thereby allowing bipolar conduction. The details are discussed in terms of the two-band model and the bipolar thermoelectric effect.

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Author notes

  1. Il-Ho Kim

    Present address: Department of Materials Science and Engineering/NTL/RIC-ReSEM, Chungju National University, 380-702, Chungbuk, Korea

Authors and Affiliations

  1. Nanotechnology Laboratory(NTL)/Research Center for Sustainable Eco-Devices and Materials (RIC-ReSEM), Chungju National University, 72, Deahangno Chungju-si, 380-702, Chungbuk, Korea

    Ramesh Chandra Mallik & Jae-Yong Jung

  2. Department of Materials Science and Engineering/NTL/RIC-ReSEM, Chungju National University, 380-702, Chungbuk, Korea

    Soon-Chul Ur

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  1. Ramesh Chandra Mallik
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  3. Soon-Chul Ur
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  4. Il-Ho Kim
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Mallik, R.C., Jung, JY., Ur, SC. et al. Transport properties on Sn-filled and Te-doped CoSb3 skutterudites. Met. Mater. Int. 14, 615–620 (2008). https://doi.org/10.3365/met.mat.2008.10.615

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