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<p>Recently, electric-field-induced strain (electrostrain) illusions arising from electric-field-induced bending (electrobending) deformation in thin piezoceramics have garnered widespread attention. However, despite the ultrahigh apparent strain, the driving forces generated by electrobending remain insufficient for practical piezoelectric actuator applications. Herein, genuine electrostrains of 0.30 and 0.29% are demonstrated in thick (&gt; 800&#xa0;μm) K<sub>0.47</sub>Na<sub>0.47</sub>Li<sub>0.06</sub>Nb<sub>0.995</sub>Cu<sub>0.005</sub>O<sub>3</sub> and K<sub>0.47</sub>Na<sub>0.47</sub>Li<sub>0.06</sub>Nb<sub>0.995</sub>Mn<sub>0.005</sub>O<sub>3</sub> ceramics through defect engineering. These compositions exhibit strongly pinched polarization–electric field (<i>P-E</i>) hysteresis loops accompanied by symmetric bipolar strain-electric field (<i>S-E</i>) curves. The substantially enhanced strain response is attributed to recoverable non-180° domain switching, wherein defect dipoles provide the restoring force. This work offers a viable paradigm for achieving high piezoelectric strains via defect engineering in ferroelectric ceramics.</p> Graphical abstract <p></p>

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Large electrostrain in KNN-based ceramics via defect engineering

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Yi Cheng,
  • Haozhe Bu,
  • Junhui Tan,
  • Jixiang Fu,
  • Bao Ou,
  • Guanfu Liu,
  • Xiqi Chen,
  • Kunlun Chen,
  • Bin Li,
  • Yejing Dai

摘要

Recently, electric-field-induced strain (electrostrain) illusions arising from electric-field-induced bending (electrobending) deformation in thin piezoceramics have garnered widespread attention. However, despite the ultrahigh apparent strain, the driving forces generated by electrobending remain insufficient for practical piezoelectric actuator applications. Herein, genuine electrostrains of 0.30 and 0.29% are demonstrated in thick (> 800 μm) K0.47Na0.47Li0.06Nb0.995Cu0.005O3 and K0.47Na0.47Li0.06Nb0.995Mn0.005O3 ceramics through defect engineering. These compositions exhibit strongly pinched polarization–electric field (P-E) hysteresis loops accompanied by symmetric bipolar strain-electric field (S-E) curves. The substantially enhanced strain response is attributed to recoverable non-180° domain switching, wherein defect dipoles provide the restoring force. This work offers a viable paradigm for achieving high piezoelectric strains via defect engineering in ferroelectric ceramics.

Graphical abstract