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

Author:

Gao Xiaoyi,Cheng ZhenxiangORCID,Chen ZibinORCID,Liu Yao,Meng Xiangyu,Zhang Xu,Wang JianliORCID,Guo Qinghu,Li Bei,Sun Huajun,Gu QinfenORCID,Hao Hua,Shen QiangORCID,Wu JinsongORCID,Liao XiaozhouORCID,Ringer Simon P.ORCID,Liu Hanxing,Zhang Lianmeng,Chen Wen,Li FeiORCID,Zhang ShujunORCID

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.

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry

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