Ultrahigh thermal stability and piezoelectricity of lead-free KNN-based texture piezoceramics

Lihui Xu, Jinfeng Lin, Yuxuan Yang, Zhihao Zhao, Xiaoming Shi, Guanglong Ge, Jin Qian, Cheng Shi, Guohui Li, Simin Wang, Yang Zhang, Peng Li, Bo Shen (), Zhengqian Fu, Haijun Wu (), Houbing Huang (), Fei Li, Xiangdong Ding, Jun Sun and Jiwei Zhai ()
Additional contact information
Lihui Xu: Tongji University
Jinfeng Lin: Tongji University
Yuxuan Yang: Xi’an Jiaotong University
Zhihao Zhao: Xi’an Jiaotong University
Xiaoming Shi: University of Science and Technology Beijing
Guanglong Ge: Tongji University
Jin Qian: Tongji University
Cheng Shi: Tongji University
Guohui Li: Tongji University
Simin Wang: Tongji University
Yang Zhang: Xi’an Jiaotong University
Peng Li: Liaocheng University
Bo Shen: Tongji University
Zhengqian Fu: State Key Lab High Performance Ceram & Superfine
Haijun Wu: Xi’an Jiaotong University
Houbing Huang: Beijing Institute of Technology
Fei Li: Xi’an Jiaotong University
Xiangdong Ding: Xi’an Jiaotong University
Jun Sun: Xi’an Jiaotong University
Jiwei Zhai: Tongji University

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

Abstract: Abstract The contradiction between high piezoelectricity and uniquely poor temperature stability generated by polymorphic phase boundary is a huge obstacle to high-performance (K, Na)NbO3 -based ceramics entering the application market as Pb-based substitutes. We possess the phase boundary by mimicking Pb(Zr, Ti)O3’s morphotropic phase boundary structure via the synergistic optimization of diffusion phase boundary and crystal orientation in 0.94(Na0.56K0.44)NbO3−0.03Bi0.5Na0.5ZrO3−0.03(Bi0.5K0.5)HfO3 textured ceramics. As a result, a prominent comprehensive performance is obtained, including giant d33 of 550 ± 30 pC/N and ultrahigh temperature stability (d33 change rate less than 1.2% within 25-150 °C), representing a significant breakthrough in lead-free piezoceramics, even surpassing the Pb-based piezoelectric ceramics. Within the same temperature range, the d33 change rate of the commercial Pb(Zr, Ti)O3−5 ceramics is only about 10%, and more importantly, its d33 (~ 350 pC/N) is much lower than that of the (K, Na)NbO3-based ceramics in this work. This study demonstrates a strategy for constructing the phase boundary with MPB feature, settling the problem of temperature instability in (K, Na)NbO3-based ceramics.

Date: 2024
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DOI: 10.1038/s41467-024-53437-5

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