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Ultrahigh Piezoelectric Properties in Textured (K,Na)NbO 3 ‐Based Lead‐Free Ceramics
Author(s) -
Li Peng,
Zhai Jiwei,
Shen Bo,
Zhang Shujun,
Li Xiaolong,
Zhu Fangyuan,
Zhang Xingmin
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201705171
Subject(s) - piezoelectricity , materials science , natural bond orbital , ceramic , electromechanical coupling coefficient , anisotropy , planar , polarization (electrochemistry) , phase (matter) , composite material , optoelectronics , optics , density functional theory , computer science , chemistry , computational chemistry , physics , computer graphics (images) , organic chemistry
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 ( d 33 ≈700 pC N −1 , d 33 * ≈980 pm V −1 ) and planar electromechanical coupling factor ( k p ≈76%) are achieved in highly textured (K,Na)NbO 3 (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.