Abstract
The complex ions (Mn1/3Nb2/3)4+ doped 0.82BNT–0.18BKT (BNKT-xMN) ceramics were prepared by conventional solid-state sintering. The effects of the MN content on the structural and electrical properties of the BNKT-xMN ceramics were investigated. The grain size decreases sharply after doping MN. With the increase of the MN content, the phase structure changes from the rhombohedral and tetragonal phase to the tetragonal phase, then to the pseudo-cubic phase. The ferroelectric phase transforms to the relaxor phase. At critical phase (x = 0.03), the maximum positive bipolar strain and unipolar strain are 0.38 and 0.386%, respectively. The corresponding \(d_{33}^{*}\) and d33 are 767 pm V–1 and 158 pC N–1, respectively. Meanwhile, the dielectric constant gradually decreases with the increase of the MN content, which flattens the permittivity curves. The large piezoelectric responses are closely associated with the reversible relaxor-ferroelectric phase transformation.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (11664006, 61965007), Guangxi Natural Science Foundation (2018GXNSFDA281042), Innovation Project of GUET Graduate Education (2018YJCX81) and Guangxi Key Laboratory of Information Materials (191023-Z).
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Shen, Y., Xie, H., Sun, Y. et al. High piezoelectric properties of 0.82(Bi0.5Na0.5)TiO3–0.18(Bi0.5K0.5)TiO3 lead-free ceramics modified by (Mn1/3Nb2/3)4+ complex ions. Bull Mater Sci 44, 100 (2021). https://doi.org/10.1007/s12034-021-02389-3
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DOI: https://doi.org/10.1007/s12034-021-02389-3