Ultrahigh Piezoelectric Properties in Textured (K,Na)NbO<sub>3</sub>‐Based Lead‐Free Ceramics

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  • Peng Li
    Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education School of Materials Science and Engineering Tongji University Shanghai 201804 China
  • Jiwei Zhai
    Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education School of Materials Science and Engineering Tongji University Shanghai 201804 China
  • Bo Shen
    Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education School of Materials Science and Engineering Tongji University Shanghai 201804 China
  • Shujun Zhang
    Institute for Superconducting and Electronic Materials Australian Institute of Innovative Materials University of Wollongong NSW 2500 Australia
  • Xiaolong Li
    Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China
  • Fangyuan Zhu
    Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China
  • Xingmin Zhang
    Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China

Description

<jats:title>Abstract</jats:title><jats:p>High‐performance lead‐free piezoelectric materials are in great demand for next‐generation electronic devices to meet the requirement of environmentally sustainable society. Here, ultrahigh piezoelectric properties with piezoelectric coefficients (<jats:italic>d</jats:italic><jats:sub>33</jats:sub> ≈700 pC N<jats:sup>−1</jats:sup>, <jats:italic>d</jats:italic><jats:sub>33</jats:sub>* ≈980 pm V<jats:sup>−1</jats:sup>) and planar electromechanical coupling factor (<jats:italic>k</jats:italic><jats:sub>p</jats:sub> ≈76%) are achieved in highly textured (K,Na)NbO<jats:sub>3</jats:sub> (KNN)‐based ceramics. The excellent piezoelectric properties can be explained by the strong anisotropic feature, optimized engineered domain configuration in the textured ceramics, and facilitated polarization rotation induced by the intermediate phase. In addition, the nanodomain structures with decreased domain wall energy and increased domain wall mobility also contribute to the ultrahigh piezoelectric properties. This work not only demonstrates the tremendous potential of KNN‐based ceramics to replace lead‐based piezoelectrics but also provides a good strategy to design high‐performance piezoelectrics by controlling appropriate phase and crystallographic orientation.</jats:p>

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