The mechanism for the enhanced piezoelectricity in multi-elements doped (K,Na)NbO3 ceramics

Xiaoyi Gao, Zhenxiang Cheng, Zibin Chen, Yao Liu, Xiangyu Meng, Xu Zhang, Jianli Wang, Qinghu Guo, Bei Li, Huajun Sun, Qinfen Gu, Hua Hao, Qiang Shen (), Jinsong Wu (), Xiaozhou Liao, Simon P. Ringer, Hanxing Liu, Lianmeng Zhang, Wen Chen, Fei Li () and Shujun Zhang ()
Additional contact information
Xiaoyi Gao: Wuhan University of Technology
Zhenxiang Cheng: University of Wollongong
Zibin Chen: The University of Sydney
Yao Liu: Xi’an Jiaotong University
Xiangyu Meng: Wuhan University of Technology
Xu Zhang: Wuhan University of Technology
Jianli Wang: University of Wollongong
Qinghu Guo: Wuhan University of Technology
Bei Li: Wuhan University of Technology
Huajun Sun: Wuhan University of Technology
Qinfen Gu: Australian Synchrotron (ANSTO)
Hua Hao: Wuhan University of Technology
Qiang Shen: Wuhan University of Technology
Jinsong Wu: Wuhan University of Technology
Xiaozhou Liao: The University of Sydney
Simon P. Ringer: The University of Sydney
Hanxing Liu: Wuhan University of Technology
Lianmeng Zhang: Wuhan University of Technology
Wen Chen: Wuhan University of Technology
Fei Li: Xi’an Jiaotong University
Shujun Zhang: University of Wollongong

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract (K,Na)NbO3 based ceramics are considered to be one of the most promising lead-free ferroelectrics replacing Pb(Zr,Ti)O3. Despite extensive studies over the last two decades, the mechanism for the enhanced piezoelectricity in multi-elements doped (K,Na)NbO3 ceramics has not been fully understood. Here, we combine temperature-dependent synchrotron x-ray diffraction and property measurements, atomic-scale scanning transmission electron microscopy, and first-principle and phase-field calculations to establish the dopant–structure–property relationship for multi-elements doped (K,Na)NbO3 ceramics. Our results indicate that the dopants induced tetragonal phase and the accompanying high-density nanoscale heterostructures with low-angle polar vectors are responsible for the high dielectric and piezoelectric properties. This work explains the mechanism of the high piezoelectricity recently achieved in (K,Na)NbO3 ceramics and provides guidance for the design of high-performance ferroelectric ceramics, which is expected to benefit numerous functional materials.

Date: 2021
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DOI: 10.1038/s41467-021-21202-7

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