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7166675 
Journal Article 
Ultrahigh Piezoelectric Properties in Textured (K,Na)NbO3-Based Lead-Free Ceramics 
Li, P; Zhai, J; Shen, Bo; Zhang, S; Li, X; Zhu, F; Zhang, X; , 
2018 
Yes 
Advanced Materials
ISSN: 0935-9648
EISSN: 1521-4095 
WILEY-V C H VERLAG GMBH 
WEINHEIM 
29318671 
WOS:000425449300016 
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) approximate to 700 pC N-1, d(33)* approximate to 980 pm V-1) and planar electromechanical coupling factor (k(p) approximate to 76%) are achieved in highly textured (K,Na)NbO3 (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.