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<p>Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-based lead-free piezoelectric ceramics face a central challenge: the difficulty in simultaneously achieving a high piezoelectric constant (<i>d</i><sub>33</sub>) and a large-signal piezoelectric constant (<i>d</i><sub>33</sub><sup>*</sup>), which limits their application in actuators and transducers. This study proposes a synergistic strategy of constructing a complex phase coexistence region and introducing an internal bias field in (Bi<sub>0.5</sub>Na<sub>0.5</sub>)<sub>0.76</sub>Sr<sub>0.24</sub>TiO<sub>3</sub> ceramics through Li<sup>+</sup> doping to coordinate the trade-off between <i>d</i><sub>33</sub> and <i>d</i><sub>33</sub><sup>*</sup>. Through this strategy, the (Bi<sub>0.5</sub>Na<sub>0.5</sub>)<sub>0.76</sub>Sr<sub>0.24</sub>TiO<sub>3</sub>-<i>x</i> wt% Li<sub>2</sub>CO<sub>3</sub> (BNSTL-<i>x</i>) ceramics with <i>x </i>= 1.00 simultaneously achieve outstanding piezoelectric properties: <i>d</i><sub>33</sub> = 281&#xa0;pC/N and an ultrahigh large-signal piezoelectric coefficient <i>d</i><sub>33</sub><sup>*</sup> = 1250&#xa0;pm/V. A complex phase coexistence, combined with an optimized grain size, contributes to the high piezoelectric response. Furthermore, the superposition of the internal bias field induced by defect dipoles and the external electric field generates highly asymmetric bipolar strain curves, thereby significantly enhancing <i>d</i><sub>33</sub><sup>*</sup>. This work provides a novel material design strategy for developing high-performance lead-free piezoelectric ceramics.</p>

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Achieving high d33 and d33* simultaneously through the synergy of internal bias fields and multiphase coexistence in (Bi0.5Na0.5)0.76Sr0.24TiO3 ceramics

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Xiaoxiao Xing,
  • Changrong Zhou,
  • Hao Yang,
  • Huifang Cheng,
  • Qingning Li,
  • Changlai Yuan,
  • Shuai Cheng,
  • Songwei Wang

摘要

Bi0.5Na0.5TiO3-based lead-free piezoelectric ceramics face a central challenge: the difficulty in simultaneously achieving a high piezoelectric constant (d33) and a large-signal piezoelectric constant (d33*), which limits their application in actuators and transducers. This study proposes a synergistic strategy of constructing a complex phase coexistence region and introducing an internal bias field in (Bi0.5Na0.5)0.76Sr0.24TiO3 ceramics through Li+ doping to coordinate the trade-off between d33 and d33*. Through this strategy, the (Bi0.5Na0.5)0.76Sr0.24TiO3-x wt% Li2CO3 (BNSTL-x) ceramics with x = 1.00 simultaneously achieve outstanding piezoelectric properties: d33 = 281 pC/N and an ultrahigh large-signal piezoelectric coefficient d33* = 1250 pm/V. A complex phase coexistence, combined with an optimized grain size, contributes to the high piezoelectric response. Furthermore, the superposition of the internal bias field induced by defect dipoles and the external electric field generates highly asymmetric bipolar strain curves, thereby significantly enhancing d33*. This work provides a novel material design strategy for developing high-performance lead-free piezoelectric ceramics.