摘要
钛酸铋钠(Bi_(0.5)Na_(0.5))TiO_(3)(BNT)作为典型的钙钛矿型弛豫铁电体,具有超高的场致应变,是最有希望代替铅基体系的无铅压电体系之一。与铅基陶瓷相比,BNT基陶瓷具有驱动电压较高、迟滞较大以及温度稳定性差等劣势。为了优化无铅驱动器的应变性能,本研究采用固相反应法制备(1-x){0.76(Bi_(0.5)Na_(0.5))TiO_(3)-0.24SrTiO_(3)}-xNaNbO_(3)(BNTST-xNN,x=0~0.03)无铅铁电陶瓷。结果表明,当x=0.01时,该陶瓷在较低电场(E=4 kV/mm)下的应变值可达到0.278%,等效压电系数d^(*)_(33)高达695 pm/V。此时,陶瓷处于非遍历/遍历弛豫相界处,电场诱导弛豫-铁电相变导致大场致应变。与x=0.01相比,x=0.02时应变值为0.249%,略微下降,但迟滞却降低至43%。此外,该应变在25~100℃温度范围内维持稳定。本研究表明,在BNT基陶瓷中固溶SrTiO_(3)和NaNbO_(3)组元可以提高场致应变值,同时维持较低的驱动电场和良好的温度稳定性,可用于压电驱动器研制。
Piezoelectric actuators have advantages of fast response,high positioning accuracy,small size,and have received widespread attention in the field of precision drives.Lead-based piezoelectric actuators occupy the main commercial market.To avoid the use of the harmful element lead,lead-free piezoelectric materials and actuators must be developed.Among them,bismuth sodium titanate(Bi_(0.5)Na_(0.5))TiO_(3)(BNT),was reported but it has some disadvantages of higher driving voltage,larger hysteresis,and poor temperature stability.To optimize the strain performance of the lead-free actuator,this study adopted the solid-phase reaction method to prepare(1-x){0.76(Bi_(0.5)Na_(0.5))TiO_(3)-0.24SrTiO_(3)}-xNaNbO_(3)(BNT-ST-xNN,x=0-0.03)lead-free ferroelectric ceramics and systematically studied its fieldinduced strain performance.The results show that when x=0.01,the strain value of the ceramic can reach 0.278%under a low electric field(E=4 kV/mm),and the piezoelectric coefficient d^(*)_(33) is as high as 695 pm/V.Meanwhile,the ceramic is at the non-ergodic/ergodic relaxation phase boundary,and the electric field induced relaxor-ferroelectric phase transition leads to large field-induced strain.Compared with x=0.01,the strain value at x=0.02 is 0.249%,which is slightly reduced,but the hysteresis is significantly reduced to 43%of the comparator.In addition,the strain remains stable in the temperature range of 25-100℃.This study shows that introduction of SrTiO_(3) and NaNbO_(3) into BNT can increase the field-induced strain value while maintaining a low driving voltage and good temperature stability,indicating suitability for the development of piezoelectric actuators.
作者
杨慧平
周学凡
方豪杰
张晓云
罗行
张斗
YANG Huiping;ZHOU Xuefan;FANG Haojie;ZHANG Xiaoyun;LUO Hang;ZHANG Dou(State Key Laboratory of Powder Metallurgy,Powder Metallurgy Research Institute,Central South University,Changsha 410083,China;Hunan Meicheng Ceramic Technology Co.,Ltd.,Loudi 417000,China)
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第6期603-610,共8页
Journal of Inorganic Materials
基金
国家重点研发项目(2020YFA0711700)
国家自然科学基金(U19A2087)
湖南省创新型省份建设专项(2020GK2062)
博士后创新人才支持计划(BX2021377)。
关键词
钛酸铋钠
无铅铁电陶瓷
场致应变
弛豫态
sodium bismuth titanate
lead-free ferroelectric ceramics
field-induced strain
relaxed state
作者简介
杨慧平(1994–),女,硕士研究生.E-mail:3150289484@qq.com;通信作者:张斗,教授.E-mail:dzhang@csu.edu.cn。
