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In-Filled La0.5Co4Sb12 Skutterudite System with High Thermoelectric Figure of Merit

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Abstract

The contribution of In addition to the La0.5Co4Sb12 skutterudite structure to improve its thermoelectric properties has been demonstrated. In x La0.5Co4Sb12 (0 ≤ x ≤ 0.3) samples were prepared through mechanical alloying followed by spark plasma sintering. Characterization of the phase structure and morphology of the sintered In x La0.5Co4Sb12 bulk samples was carried out using x-ray diffraction (XRD) analysis, scanning electron microscopy, and energy-dispersive x-ray spectroscopy. Rietveld analysis of the XRD spectra indicated that double filling at the 2a (000) interstitial site with La and In was successfully achieved, significantly improving the thermoelectric performance of the La0.5Co4Sb12 compound through simultaneous increase in the electrical conductivity and Seebeck coefficient. A maximum power factor of 3.39 × 10−3 W/ m-K2 was recorded at 644 K for the In0.3La0.5Co4Sb12 sample, more than 96% of that of the La0.5Co4Sb12 sample. Double filling also effectively reduced the lattice thermal conductivity by about 46%, thus demonstrating that the overall improvement in ZT was primarily due to the reduced thermal conductivity. A maximum ZT value of 1.15 was achieved at 692 K for In0.3La0.5Co4Sb12.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Engineering, Eldaein University, 63312, Eldaein, Sudan

    Mohamed Bashir Ali Bashir

  2. Department of Electrical Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia

    Suhana Mohd Said, Mohd Faiz Mohd Salleh & Mohamad Syafie Mahmood

  3. Department of Mechanical Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia

    Mohd Faizul Mohd Sabri,  Dhafer Abdulameer Shnawah, Ethar Yahya Salih & Fitriani Fitriani

  4. Department of Applied Physics, Graduate School of Engineering, Tohoku University, 6-6-05 Aoba, Aramaki, Aoba-ku, Sendai, 980-8579, Japan

    Yuzuru Miyazaki & Masanori Shimada

  5. Faculty of Applied Science, MARA University of Technology, Shah Alam, Malaysia

    Mohamad Syafie Mahmood

  6. R&D, Cree Inc., Durham, NC, 27703, USA

    Mohamed Hamid Elsheikh

Authors
  1. Mohamed Bashir Ali Bashir
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  2. Suhana Mohd Said
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  3. Mohd Faizul Mohd Sabri
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  11. Mohamed Hamid Elsheikh
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Correspondence to Suhana Mohd Said.

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Bashir, M.B.A., Said, S.M., Sabri, .F.M. et al. In-Filled La0.5Co4Sb12 Skutterudite System with High Thermoelectric Figure of Merit. J. Electron. Mater. 47, 2429–2438 (2018). https://doi.org/10.1007/s11664-018-6074-3

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  • DOI: https://doi.org/10.1007/s11664-018-6074-3

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