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<p>(K,Na)NbO<sub>3</sub>-based ceramics are deemed among the most promising lead-free piezoelectric materials, though their overall piezoelectric performance still lags behind the mainstream lead-containing counterparts. Here, we achieve an ultrahigh piezoelectric charge coefficient d<sub>33</sub> ∼ 807 pC·N<sup>−1</sup>, along with a high longitudinal electromechanical coupling factor (k<sub>33</sub> ∼ 88%) and Curie temperature (T<sub>c</sub> ∼ 245 °C) in the (K,Na)(Nb<sub>1-<i>x</i></sub>Sb<sub><i>x</i></sub>)O<sub>3</sub>-Bi<sub>0.5</sub>Na<sub>0.5</sub>ZrO<sub>3</sub>-BiFeO<sub>3</sub> (KNN-<i>x</i>Sb) system through structural flexibility and grain orientation strategies. Phenomenological models, phase field simulations and high-angle annular dark-field scanning transmission electron microscopy reveal that the structural flexibility originates from the high Coulomb force between K<sup>+</sup>/Na<sup>+</sup> ions and Sb ions in the KNN-<i>x</i>Sb system, while the grain orientation promotes the displacement of B-site cations leveraging the engineered domain configuration. As a result of its excellent comprehensive piezoelectric properties, the textured KNN-5Sb/epoxy 1-3 piezoelectric composite is found to possess a broader bandwidth BW = 60% and higher amplitude output voltage than commercial PZT-5 and other KNN counterparts. These findings suggest that the textured KNN-5Sb ceramics could potentially replace current lead-based piezoceramics in transducer applications.</p>

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Ultrahigh piezoelectric performances of (K,Na)NbO3 based ceramics enabled by structural flexibility and grain orientation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月21日

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  • Li-Feng Zhu,
  • Dong Liu,
  • Xiaoming Shi,
  • Shiqing Deng,
  • Jiecheng Liu,
  • Li-Yu Wei,
  • Zi-Qi Yang,
  • Qi Wang,
  • Bo-Ping Zhang,
  • Houbing Huang,
  • Shujun Zhang,
  • Jing-Feng Li

摘要

(K,Na)NbO3-based ceramics are deemed among the most promising lead-free piezoelectric materials, though their overall piezoelectric performance still lags behind the mainstream lead-containing counterparts. Here, we achieve an ultrahigh piezoelectric charge coefficient d33 ∼ 807 pC·N−1, along with a high longitudinal electromechanical coupling factor (k33 ∼ 88%) and Curie temperature (Tc ∼ 245 °C) in the (K,Na)(Nb1-xSbx)O3-Bi0.5Na0.5ZrO3-BiFeO3 (KNN-xSb) system through structural flexibility and grain orientation strategies. Phenomenological models, phase field simulations and high-angle annular dark-field scanning transmission electron microscopy reveal that the structural flexibility originates from the high Coulomb force between K+/Na+ ions and Sb ions in the KNN-xSb system, while the grain orientation promotes the displacement of B-site cations leveraging the engineered domain configuration. As a result of its excellent comprehensive piezoelectric properties, the textured KNN-5Sb/epoxy 1-3 piezoelectric composite is found to possess a broader bandwidth BW = 60% and higher amplitude output voltage than commercial PZT-5 and other KNN counterparts. These findings suggest that the textured KNN-5Sb ceramics could potentially replace current lead-based piezoceramics in transducer applications.