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Over the past two decades, (K0.5Na0.5)NbO3 (KNN)-based lead-free piezoelectric ceramics have made significant progress. However, attaining a high electrostrain with remarkable temperature stability and minimal hysteresis under low electric fields has remained a significant challenge. To address this long-standing issue, we have employed a collaborative approach that combines defect engineering, phase engineering, and relaxation engineering. The LKNNS-6BZH ceramic, when sintered at Tsint = 1170 ℃, demonstrates an impressive electrostrain with a d33 value of 0.276% and 1379 pm·V–1 under 20 kV·cm–1, which is comparable to or even surpasses that of other lead-free and Pb(Zr,Ti)O3 ceramics. Importantly, the electrostrain performance of this ceramic remains stable up to a temperature of 125 ℃, with the lowest hysteresis observed at 9.73% under 40 kV·cm–1. These excellent overall performances are attributed to the presence of defect dipoles involving VAVO∙∙ and BNbVO∙∙, the coexistence of R–O–T multiphase, and the tuning of the trade-off between long-range ordering and local heterogeneity. This work provides a lead-free alternative for piezoelectric actuators and a paradigm for designing piezoelectric materials with outstanding comprehensive performance under low electric fields.


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Exceptional electrostrain with minimal hysteresis and superior temperature stability under low electric field in KNN-based lead-free piezoceramics

Show Author's information Huan Liu1,2Yijin Hao1Ziqi Yang2( )Tianyi Feng2Bin Su2Xin Zhang2Mengping Xue1Bo-Ping Zhang1( )Jing-Feng Li2( )
Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Abstract

Over the past two decades, (K0.5Na0.5)NbO3 (KNN)-based lead-free piezoelectric ceramics have made significant progress. However, attaining a high electrostrain with remarkable temperature stability and minimal hysteresis under low electric fields has remained a significant challenge. To address this long-standing issue, we have employed a collaborative approach that combines defect engineering, phase engineering, and relaxation engineering. The LKNNS-6BZH ceramic, when sintered at Tsint = 1170 ℃, demonstrates an impressive electrostrain with a d33 value of 0.276% and 1379 pm·V–1 under 20 kV·cm–1, which is comparable to or even surpasses that of other lead-free and Pb(Zr,Ti)O3 ceramics. Importantly, the electrostrain performance of this ceramic remains stable up to a temperature of 125 ℃, with the lowest hysteresis observed at 9.73% under 40 kV·cm–1. These excellent overall performances are attributed to the presence of defect dipoles involving VAVO∙∙ and BNbVO∙∙, the coexistence of R–O–T multiphase, and the tuning of the trade-off between long-range ordering and local heterogeneity. This work provides a lead-free alternative for piezoelectric actuators and a paradigm for designing piezoelectric materials with outstanding comprehensive performance under low electric fields.

Keywords: lead-free piezoelectric ceramics, temperature stability, electrostrain, potassium sodium niobate, low hysteresis

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Received: 18 December 2023
Revised: 23 January 2024
Accepted: 02 February 2024
Published: 29 March 2024
Issue date: March 2024

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© The Author(s) 2024.

Acknowledgements

Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 52032007 and 52072028), the National Key R&D Program (No. 2022YFB3807400), the Basic Science Center Project of National Natural Science Foundation of China (No. 52388201), and Tsinghua University–Toyota Research Center.

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This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).

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