材料工程2024，Vol.52Issue(4)：43-53,11.DOI:10.11868/j.issn.1001-4381.2023.000255
Gd3+掺杂调控BiFeO3-BaTiO3高温无铅压电陶瓷的结构与性能
Structures and properties of Gd3+ doped modified BiFeO3-BaTiO3 high-temperature lead-free piezoelectric ceramics
摘要
Abstract
Piezoelectric acceleration sensors are used for monitoring the vibration state of high-temperature components of some important technical equipment,such as aero engines and heavy gas turbines.These sensors require a high Curie temperature piezoelectric ceramic as a sensitive element,and"lead-free"electronic components are an urgent requirement for environmental protection.Gd/Mn co-doped high-temperature lead-free piezoelectric ceramics((0.67BiFeO3-0.33Ba1-xGdxTiO3)+0.5%(mass fraction)MnO2,x=0-0.02,BF-BT)were prepared by a traditional solid-state reaction process.The effects of doping concentration x of Gd3+ on the phase composition,microstructure,piezoelectric property,dielectric relaxation behavior and AC impedance characteristic of BF-BTceramics were investigated.The results show that all samples have pure perovskite structure with coexistence of tripartite phase(R)and tetragonal phase(T),and the T phase content increases with the increasing Gd3+ doping concentration.Moderate amount(x<0.02)of Gd3+ dopant diffusing into the perovskite lattice would also promote the grain growth of BF-BT ceramics.Gd3+ doped samples exhibit enhanced relaxation phase transition behavior.The phase transition temperature(Tm)decreases with the increase of x,while the dielectric relaxation degree(ΔTrelax)increases with the increase of x.The R-CPE equivalent circuit model has been utilized to match the complex impedance spectra(Cole-Cole diagrams)of the BF-BTceramics,indicating that the AC impedance of samples at high temperature is mainly contributed by the grain boundary.The activation energy of dielectric relaxation increases with the increasing Gd3+ doping concentration,demonstrating the substitution of Gd3+ for Ba2+ can reduce the donor doping effect.In general,when x=0.01,the sample exhibits the optimized electrical properties,including TC=425℃,d33=126 pC/N,kp=25.9%,and tanδ=0.059.The Gd3+ doped BF-BTceramics are expected to be used as a promising high-temperature piezoelectric material.关键词
BiFeO3-BaTiO3/高温无铅压电陶瓷/离子掺杂/介电弛豫/交流阻抗Key words
BiFeO3-BaTiO3/high-temperature lead-free piezoelectric ceramics/ion doping/dielectric relax-ation/AC impedance分类
信息技术与安全科学引用本文复制引用
唐蓝馨,王芳,周治,李双池,左鑫,李凌峰,杨柳,谭启,陈渝..Gd3+掺杂调控BiFeO3-BaTiO3高温无铅压电陶瓷的结构与性能[J].材料工程,2024,52(4):43-53,11.基金项目
机械结构力学与控制国家重点实验室开放课题(MCMS-E-0522G01) （MCMS-E-0522G01）
四川省自然科学基金(2022NSFSC1968) （2022NSFSC1968）
广东省能量转换材料与技术重点实验室开放基金(MATEC2022KF001) （MATEC2022KF001）
四川省大学生创新创业训练计划项目(S202311079053) （S202311079053）
