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Research Article | Open Access

Ultrahigh electrostrain with excellent fatigue resistance in textured Nb5+-doped (Bi0.5Na0.5)TiO3-based piezoceramics

Lixiang Lai, Zhihao Zhao, Shuo Tian, Bao Ou, Gaoyuan Liang, Bin Li(), Yejing Dai()
School of Materials, Sun Yat-sen University, Shenzhen 518107, China
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Abstract

(Bi0.5Na0.5)TiO3 (BNT)-based lead-free piezoceramics exhibit excellent electric field-induced strain (electrostrain) properties, but often suffer from large hysteresis and poor fatigue resistance, which strongly limit their applications. Here, <00l> textured Nb5+-doped 0.8(Bi0.5Na0.5)TiO3–0.2(Bi0.5K0.5)TiO3 (0.8BNT–0.2BKT) ceramics with a high degree of texturing (~80%) were prepared by the reactive template grain growth (RTGG) method using Bi4Ti3O12 as a template. By the combination of donor doping in the B-site and the RTGG method, the electrostrain performance achieves a significant enhancement. A high electrostrain of 0.65% and a piezoelectric coefficient (d33*) of 1083 pm/V with reduced hysteresis at an electric field of 6 kV/mm are obtained. No electrostrain performance degradation is observed after unipolar electric field loading of 105 cycles, showing excellent fatigue endurance. These results indicate that the texturing BNT-based lead-free piezoceramics by the RTGG method is a useful approach to developing eco-friendly actuators.

Keywords

(Bi0.5Na0.5)TiO3 (BNT)-based ceramicsdonor dopingelectrostraintextured ceramics

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Journal of Advanced Ceramics
Volume 12 Issue 3,
March 2023
Pages 487-497
DOI: 10.26599/JAC.2023.9220698
Cite this article:
Lai L, Zhao Z, Tian S, et al. Ultrahigh electrostrain with excellent fatigue resistance in textured Nb5+-doped (Bi0.5Na0.5)TiO3-based piezoceramics. Journal of Advanced Ceramics, 2023, 12(3): 487-497. https://doi.org/10.26599/JAC.2023.9220698
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