Abstract
A series of K-doped Bi1−x K x CuSeO (0 ≤ x ≤ 0.10) compounds were prepared by combustion synthesis combined with spark plasma sintering method. Phase composition and microstructure analysis indicate almost single BiCuSeO phase in low doping level, while phase separation appears in heavy doping level. The thermoelectric properties of the Bi1−x K x CuSeO compounds have been measured in the temperature range of 323–823 K. The electrical conductivity is greatly enhanced by almost three times from 8.70 to 26.2 S/cm at 323 K by the substitution of Bi with K due to the large decrease of the activation energy. The overall thermal conductivity decreases significantly due to the strong point defect scattering by K doping and possibly enhanced interface scattering on the secondary phase. The maximum ZT reaches 0.6 at 823 K for the sample of x = 0.02, which is about 50% higher than that of the pristine sample. Our work offers a fast and more efficient approach for the fabrication of BiCuSeO-based materials.
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Acknowledgements
This work was financially supported by NSF of China (51402010 and 51672155) and Natural Science Foundation of Jiangsu Province (No. BK20140270).
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Lan, JL., Ma, W., Deng, C. et al. High thermoelectric performance of Bi1−x K x CuSeO prepared by combustion synthesis. J Mater Sci 52, 11569–11579 (2017). https://doi.org/10.1007/s10853-017-1323-z
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DOI: https://doi.org/10.1007/s10853-017-1323-z