Abstract
The applied electric field to drive intended large strain response in Bi0.5Na0.5TiO3-based piezoelectric ceramics is usually high (mostly with E ≥ 60 kV/cm) and remains a long-standing drawback for actual actuator applications. In this work, we report 〈001〉 oriented (1−x) (0.83Bi0.5Na0.5TiO3–0.17Bi0.5K0.5TiO3)–xBaTiO3 (BNT–BKT–BT) lead-free piezoelectric ceramics using BT as the template particles to tailor the strain behavior under a low driving field. The strain response exhibited an increasing trend with the increasing grain orientation, and remarkably giant S max/E max of 800 pm/V was acquired under a relatively low electric field of 45 kV/cm in the optimized microstructure for textured BNT-BKT–1BT ceramics compared with the reported lead-free Bi-based perovskite ceramics. Furthermore, the achieved textured ceramics showed prominent electric field- and temperature-dependent strain characteristic featured by both a high room-temperature S max/E max of 621 pm/V under a very low driving field of 35 kV/cm and an achievable large S max/E max of 531 pm/V with almost vanished hysteretic behavior at high temperature. Our work may be helpful for designing BNT-based lead-free materials with promising strain response and thus provides a new approach to resolve this drawback of BNT-based lead-free piezoelectric ceramics.
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Acknowledgements
The authors would like to thank the National Natural Science Foundation of China (Grant Nos. 51502067, 51302056, 21271170, 51572065), the Natural Science Foundation of Zhejiang Province (LQ16E020004, LY16E020005), the National Natural Science Foundation of (Grant Nos. 51372171, 51332003), the Shanghai Municipal Natural Science Foundation (Grant No. 12ZR1434600), and the National Natural Science Foundation of China (Grant No. 61372025).
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Bai, W., Chen, D., Zheng, P. et al. Low electric field-driven giant strain response in 〈001〉 textured BNT-based lead-free piezoelectric materials. J Mater Sci 52, 3169–3178 (2017). https://doi.org/10.1007/s10853-016-0606-0
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DOI: https://doi.org/10.1007/s10853-016-0606-0