Comprehensive optimization of piezoelectric coefficient and depolarization temperature in Mn-doped Bi_(0.5)Na_(0.5)TiO_(3)-Bi_(0.5)K_(0.5)TiO_(3)-BaTiO_(3)lead-free piezoceramics  

作　　者：Huashan Zheng Enwei Sun Huajie Luo Xiaoyu Zhang Yixiao Yang Bin Yang Rui Zhang Shantao Zhang Wenwu Cao 

机构地区：[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]Department of Mathematics and Materials Research Institute,The Pennsylvania State University,University Park,Pennsylvania,16802,United States of America

出　　处：《Journal of Materials Science & Technology》2024年第5期255-263,共9页材料科学技术（英文版）

基　　金：supported by the Natural Science Foundation of Heilongjiang Province(No.LH2021A012).

摘　　要：Lead-free Bi_(_(0.5))Na_(_(0.5))TiO_(3)(BNT)piezoelectric ceramics have the advantages of large coercive fields and high Curie temperatures.But the improvement of piezoelectric coefficient(d 33)is usually accompanied by a huge sacrifice of depolarization temperature(T d).In this work,a well-balanced performance of d 33 and T d is achieved in MnO_(2)-doped 0.79(Bi_(_(0.5))Na_(_(0.5))TiO_(3))-0.14(Bi_(0.5)K_(0.5)TiO_(3))-0.07BaTiO_(3)ternary ceramics.The in-corporation of 0.25 mol%MnO_(2)enhances the d 33 by more than 40%,while T d remains almost unchanged(i.e.,d 33=181 pC/N,T d=184℃).X-ray diffraction(XRD)shows that an appropriate fraction of the small axis-ratio ferroelectric phase(pseudo-cubic,P c)coexists with the long-range ferroelectric phase(tetrag-onal,T)under this MnO_(2)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.

关 键 词：BNT-BKT-BT ceramics Mn doping Piezoelectric Depolarization temperature Phase structure 

分 类 号：TQ1[化学工程]