Multiscale reconfiguration induced highly saturated poling in lead-free piezoceramics for giant energy conversion

Jinfeng Lin, Jin Qian, Guanglong Ge, Yuxuan Yang, Jiangfan Li, Xiao Wu, Guohui Li, Simin Wang, Yingchun Liu, Jialiang Zhang, Jiwei Zhai (), Xiaoming Shi () and Haijun Wu ()
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Jinfeng Lin: Tongji University
Jin Qian: Tongji University
Guanglong Ge: Tongji University
Yuxuan Yang: Xi’an Jiaotong University
Jiangfan Li: Shandong University
Xiao Wu: Fuzhou University
Guohui Li: Tongji University
Simin Wang: Tongji University
Yingchun Liu: Harbin Institute of Technology
Jialiang Zhang: Shandong University
Jiwei Zhai: Tongji University
Xiaoming Shi: University of Science and Technology Beijing
Haijun Wu: Xi’an Jiaotong University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract The development of high-performance lead-free K0.5Na0.5NbO3-based piezoceramics for replacing commercial lead-containing counterparts is crucial for achieving environmentally sustainable society. Although the proposed new phase boundaries (NPB) can effectively improve the piezoelectricity of KNN-based ceramics, the difficulty of achieving saturated poling and the underlying multiscale structures resolution of their complex microstructures are urgent issues. Here, we employ a medium entropy strategy to design NPB and utilize texture engineering to induce crystal orientation. The developed K0.5Na0.5NbO3-based ceramics enjoys both prominent piezoelectric performance and satisfactory Curie temperature, thus exhibiting an ultrahigh energy harvesting performance as well as excellent transducer performance, which is highly competitive in both lead-free and lead-based piezoceramics. Comprehensive structural analysis have ascertained that the field-induced efficient multiscale polarization configurations irreversible transitions greatly encourages high saturated poling. This study demonstrates a strategy for designing high-performance piezoceramics and establishes a close correlation between the piezoelectricty and the underlying multiscale structures.

Date: 2024
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DOI: 10.1038/s41467-024-46894-5

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