Abstract
The influence mechanism of Nano-TiO2 on the electrical and thermal transporting properties of BiCuSeO ceramics has been investigated. BiCuSeO matrix powders and nano-TiO2 powders were mixed by high-energy mechanical alloying, and then sintered by spark plasma method. The results of micro-morphology tests indicated that the nano-TiO2 particles were distributed on the surface and interior of the matrix. Due to the low electrical conductivity (σ) of TiO2, the σ of the dispersed sample decreased slightly after the compositing. For the energy filtering effect and the decrease of carrier concentration caused by the nano-TiO2 particles, the Seebeck coefficient increases in the whole temperature zone from room temperature to 873 K. For that the average free path of phonons decreased due to the nano dispersed particles, the thermal conductivity decreased correspondingly. Through the dispersion of nano-TiO2, the electron/phonon transporting of BiCuSeO has reached a better balance, and the thermoelectric properties improved significantly with the largest ZT of ~ 1.204 at 873 K.
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Acknowledgements
The work is supported by the Natural Science Foundation of Hubei Province (2021CFB009), 2021 Hubei Province supporting enterprise technological innovation and development project (2021BAB064), and the School youth fund of Wuhan Donghu University. Thank my tutors Professor Fan Xi'an and Professor Li Guangqiang for their guidance. Thank my wife Wang Wei for her support.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by BF and YL. The first draft of the manuscript was written by BF, revised by YT, and all authors have approved the final manuscript.
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Feng, B., Liu, Y. & Tang, Y. Influence mechanism of nano-TiO2 dispersion on thermoelectric properties of BiCuSeO. J Mater Sci: Mater Electron 33, 16396–16405 (2022). https://doi.org/10.1007/s10854-022-08531-z
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DOI: https://doi.org/10.1007/s10854-022-08531-z