摘要
笔者采用传统固相法制备了0.99(Ba_(1-x)Ca_(x))(Zr_(0.1)Ti_(0.9))O_(3)-0.01BiFeO_(3)(BC_(x)ZT,x=0.00,0.06,0.12,0.18)无铅压电陶瓷,系统地研究了Ca含量对陶瓷相结构、微观形貌和电学性能的影响。研究结果表明:所有样品均为ABO_(3)钙钛矿结构固溶体,无其他杂相存在;随着Ca含量的增加,陶瓷晶体结构从三方相向四方相转变。Ca的加入对频率色散影响不明显,具有良好的频率稳定性。通过拟合修正后的Curie-Weiss定律,研究介电弛豫特性,γ值由1.76降到1.61,说明陶瓷弛豫程度下降。Ca取代Ba后,d_(33)和k_(p)均呈现先增加后减小的变化趋势,当x=0.12时获得最佳电学性能:ε_(r)=4448、tanδ=0.013、d_(33)=207pC/N、k_(p)=0.24。从P-E曲线观察出,P_(r)和E_(c)都先增后减,在Ca含量为0.12时,P-E曲线最为饱和,铁电性能最佳:P_(r)=1.7μC/cm^(2),E_(c)=0.30kV/mm。
Lead-free piezoelectric ceramics of 0.99(Ba_(1-x)Ca_(x))(Zr_(0.1)Ti_(0.9))O_(3)-0.01 BiFeO_(3)(BC_(x)ZT,x=0.00,0.06,0.12,0.18)were prepared by traditional solid-state method.The effects of Ca content on phase structure,microstructure and electrical properties of ceramic system were systematically investigated.The following results were obtained:all samples were solid solutions of ABO_(3) perovskite structure,and no other heterophase exists.With the increase of Ca content,the ceramic crystal structure changes from tripartite to tetragonal phase.The addition of Ca has no obvious effect on frequency dispersion and has good frequency stability.By fitting the modified Curie-Weiss law,the dielectric relaxation characteristics were studied,and theγvalue decreased from 1.76 to 1.61,indicating that the relaxation degree of ceramics decreased.When Ca replaces Ba,both d_(33) and k_(p) increase first and then decrease.When x=0.12,the best electrical performance is obtained:d_(33)=207 pC/N,k_(p)=0.24,ε_(r)=4448,tanδ=0.013.It was observed from the P-E curve that both P_(r) and E_(c) increased first and then decreased.When Ca content was 0.12,the P-E curve was the most saturated,and the ferroelectric performance was the best:P_(r)=1.7μC/cm^(2),E_(c)=0.30 kV/mm.
作者
杜建周
邱龙
肖鑫
王路明
朱孔军
Du Jianzhou;Qiu Long;Xiao Xin;Wang Luming;Zhu Kongjun(College of Material and Engineering,Yancheng Institute of Technology,Jiangsu,Yancheng,224051,China;State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China)
出处
《陶瓷》
CAS
2022年第4期40-46,共7页
Ceramics
基金
江苏省高校自然科学研究面上项目(16KJB430030)
机械结构力学及控制国家重点实验室开放课题(MCMS-E-0521G02)
盐城工学院人才引进项目(xj201528)。
关键词
铅压电陶瓷
BCZT
相变
介电弛豫
影响
Lead-free piezoelectric ceramics
BCZT
Phase transition
Dielectric behavior
Influence
