header

Ultrahigh Electro-Strain in Acceptor-Doped KNN Lead-Free Piezoelectric Ceramics Via Defect Engineering

23 Pages Posted: 1 Jun 2020 Publication Status: Accepted

See all articles by Zhihao Zhao

Zhihao Zhao

Sun Yat-sen University (SYSU) - School of Materials

Yukai Lv

Tianjin University - Key Laboratory of Advanced Ceramics and Machining Technology

Ye-Jing Dai

Sun Yat-sen University (SYSU) - School of Materials

Shujun Zhang

University of Wollongong - Institute for Superconducting and Electronic Materials (ISEM)

Abstract

Defect dipoles in acceptor-doped perovskite-based ferroelectric ceramics play an important role in piezoelectric properties. In this work, the acceptor, such as Fe2+ and Cu+, -doped (K0.5N0.5)NbO3 (KNN) ceramics are fabricated in reduced atmosphere by the conventional solid-state reaction method. By tailoring the strongly polarized defect dipoles through poling and aging processes, ultrahigh electro-strain and large signal piezoelectric d33* values can be achieved. The electro-strains of 0.41% and 0.50% with d33* ~820 pm/V and ~1000 pm/V are obtained in Fe2+-doped and Cu+-doped KNN samples, respectively, which are 4-fold and 5-fold larger than that of pure KNN. Of particular interest is that the electro-strain and d33* values are found to improve with increasing temperature up to 140 °C, accompanied with low strain hysteresis of 10%-20%. A detailed mechanism considering the interaction between defect dipole polarization and spontaneous polarization after poling and aging processes is proposed to explain the observed phenomena, which provides a good paradigm for achieving high piezoelectric response by defect engineering in perovskite-based ferroelectric ceramics.

Keywords: Electro-strain, Lead-free piezoelectric ceramics, Defect engineering, (K0.5N0.5)NbO3

Suggested Citation

Zhao, Zhihao and Lv, Yukai and Dai, Ye-Jing and Zhang, Shujun, Ultrahigh Electro-Strain in Acceptor-Doped KNN Lead-Free Piezoelectric Ceramics Via Defect Engineering. Available at SSRN: https://ssrn.com/abstract=3604592 or http://dx.doi.org/10.2139/ssrn.3604592

Zhihao Zhao

Sun Yat-sen University (SYSU) - School of Materials ( email )

Guangzhou
China

Yukai Lv

Tianjin University - Key Laboratory of Advanced Ceramics and Machining Technology

Tianjin
China

Ye-Jing Dai (Contact Author)

Sun Yat-sen University (SYSU) - School of Materials ( email )

Guangzhou
China

Shujun Zhang

University of Wollongong - Institute for Superconducting and Electronic Materials (ISEM) ( email )

Wollongong, NSW 2500
Australia

Do you have negative results from your research you’d like to share?

Paper statistics

Downloads
93
Abstract Views
348
PlumX Metrics