摘要
通过铌铁矿先驱法制备了Pb(Mg_(1/3)Nb_(2/3))O_3-Pb(Mn_(1/3)Nb_(2/3))O_3-PbZrO_3-PbTiO_3+0.3%CeO_2(质量分数)+xSrCO_3(PMN-PMnN-PZT-Ce-xSr,x=0.00,0.03,0.05,0.07)四元系压电陶瓷,研究了SrCO_3含量的变化对Pb(Mg_(1/3)Nb_(2/3))O_3-Pb(Mn_(1/3)-Nb_(2/3))O_3-PbZrO_3-PbTiO_3+0.3%CeO_2(质量分数)(PMN-PMnN-PZT-Ce)压电陶瓷相结构、储能密度以及弛豫行为的影响。通过XRD表明,样品为单一稳定的钙钛矿结构,并且存在准同晶界(MPB);当x=0.07时,在外加电场60kV/cm下取得较好的储能性能:储能密度W1=0.31J/cm^3,储能效率η=0.47;通过修正Curie-Weise定律,较好地描述了陶瓷弥散相变的特征,弥散相变系数γ随着Sr^(2+)掺杂量的增加而增加。当x=0.07时,γ取得最大值1.972 8,此时弛豫现象最明显。
A series of Pb（Mg1/3Nb2/2）O3-Pb（Mn1/3Nb2/s）Os-PbZrOs-PbTiO3 ＋0. 3%CeO2 （in mass fraction） ＋xSr （PMN- PMnN-PZT-Ce-xSr, x=0. 00,0. 03,0. 05,0. 07） ceramics were prepared by a columbite precursor method, and phase structures, energy-storage properties and relaxation behaviors of the as-prepared PMN-PMnN-PZT ceramics varied in SrCOs contents were stu- died. According to the results by X-ray diffraction, all samples are a single perovskite phase and possess a morphotropic phase boundary （MPB）. The sample with ：r= 0. 07 obtained satisfactory energy storage performance, as its energy storage density and energy storage efficiency were 0. 31 J/cms and 0. 47, respectively under 60 kV/cm electric field. A modified Curie-Weiss law can describe the diffuse phase transition properly, and when Sr addition increases the dispersion coefficient of phase transformation 7 increases. The sample with x=0. 07, ） reaches a maximum value of 1. 972 8, indicating that the dielectric relaxation behavior of ceramic is more evident.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2017年第6期11-15,共5页
Materials Reports
基金
国家自然科学基金(51202038)
贵州省国际科技合作计划项目(黔科合外G字[2012]7010号)
贵州省工业攻关项目(黔科合GY字(2013)3075)
关键词
压电陶瓷
相结构
储能性能
介电弛豫
弥散相变
piezoelectric ceramic, phase structure, energy-storage property, dielectric relaxation, diffuse phase transition
