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Thermoelectric transport properties of BiCuSeO with embedded La0.8Sr0.2CoO3 nanoinclusions

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Abstract

The efficiency-upgrading role that La0.8Sr0.2CoO3 (LSCO) plays in the thermoelectric properties of BiCuSeO (BCSO) has been studied. LSCO was introduced into BCSO, increasing the electrical conductivity from 3.3 to 52.3 S cm−1 at 303 K, from 35.8 to 97.3 S cm−1 at 873 K; respectively. The Seebeck coefficient of all composites still holds around or more than 200 µV/K. Based on the enhanced electrical conductivity and high Seebeck coefficient, the power factor is enhanced by approximately 35%, with the best sample reaching a maximum value of 476.7 µ Wm−1 K−2 at 873 K. The lattice thermal conductivity of the nanocomposites is reduced as LSCO content increases from 15 vol% to 30 vol% due to the phonon scattering by nanoparticles and grain boundaries, resulting in a significant reduction in total thermal conductivity. In short, the enhanced thermoelectric figure of merit of 0.67 at 873 K for the sample containing 20 vol% LSCO as compared to 0.53 for the pure sample; announces the promising effect of LSCO on improving thermoelectric properties of BiCuSeO.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    YaoChun Liu & BoPing Zhang

  2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    YaoChun Liu, YuanHua Lin & CeWen Nan

  3. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China

    JinLe Lan

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  1. YaoChun Liu
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  2. JinLe Lan
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  4. YuanHua Lin
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  5. CeWen Nan
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Correspondence to YuanHua Lin.

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Liu, Y., Lan, J., Zhang, B. et al. Thermoelectric transport properties of BiCuSeO with embedded La0.8Sr0.2CoO3 nanoinclusions. Sci. China Technol. Sci. 59, 1036–1041 (2016). https://doi.org/10.1007/s11431-016-6049-7

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  • DOI: https://doi.org/10.1007/s11431-016-6049-7

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