Comprehensive optimization of piezoelectric coefficient and depolarization temperature in Mn-doped Bi0.5Na0.5TiO3-Bi0.5K0.5TiO3-BaTiO3 lead-free piezoceramics

Huashan Zheng ¹Enwei Sun ¹Huajie Luo ²Xiaoyu Zhang ³Yixiao Yang ¹Bin Yang ¹Rui Zhang ¹Shantao Zhang ³Wenwu Cao⁴

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作者信息

1. Condensed Matter Science and Technology Institute,School of Instrumentation Science and Engineering,Harbin Institute of Technology,Harbin,150080,China
2. Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing,100083,China
3. National Laboratory of Solid State Microstructures,Department of Materials Science and Engineering,College of Engineering and Applied Science &Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing,210093,China
4. Condensed Matter Science and Technology Institute,School of Instrumentation Science and Engineering,Harbin Institute of Technology,Harbin,150080,China;Department of Mathematics and Materials Research Institute,The Pennsylvania State University,University Park,Pennsylvania,16802,United States of America
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Abstract

Lead-free Bi0.5 Na0.5TiO3(BNT)piezoelectric ceramics have the advantages of large coercive fields and high Curie temperatures.But the improvement of piezoelectric coefficient(d33)is usually accompanied by a huge sacrifice of depolarization temperature(Td).In this work,a well-balanced performance of d33 and Td is achieved in MnO2-doped 0.79(Bi0.sNa0.5TiO3)-0.14(Bi0.5K0.5TiO3)-0.07BaTiO3 ternary ceramics.The in-corporation of 0.25 mol％MnO2 enhances the d33 by more than 40％,while Td remains almost unchanged(i.e.,d33=181 pC/N,Td=184 ℃).X-ray diffraction(XRD)shows that an appropriate fraction of the small axis-ratio ferroelectric phase(pseudo-cubic,Pc)coexists with the long-range ferroelectric phase(tetrag-onal,T)under this MnO2 doping.Piezoelectric force microscopy(PFM)has revealed a special domain configuration,namely large striped and layered macro domains embedded with small nanodomains.This study provides a distinctive avenue to design BNT-based piezoelectric ceramics with high piezoelectric performance and temperature stability.

Key words

BNT-BKT-BT ceramics/Mn doping/Piezoelectric/Depolarization temperature/Phase structure

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基金项目

Natural Science Foundation of Heilongjiang Province(LH2021A012)

出版年

2024

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCD

影响因子：0.657

ISSN：1005-0302

参考文献量60

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