中山大学学报(自然科学版)2011，Vol.50Issue(3)：62-67,6.
铌铁酸铅-钛酸铅铁电陶瓷的结构相变
Structural Phase Transition of (1-x)Pb(Fe1/2Nb1/2)O3-xPbTiO3 Ferroelectric Ceramics
摘要
Abstract
( 1 - x) Pb (Fe1/2Nb1/2) O3 - xPbTiO3 (PFN-PT) ferroelectric ceramics were prepared by the conventional ceramic processing via the wolframite precursor method.The X-ray diffraction (XRD)measurement and density measurement confirmed that the PFN-PT ceramics sintered at 1 150 ℃ for 2.5 h exhibited pure perovskite structure and high relative density.With the increase of the content of PbTiO3 (PT), the crystal structure of PFN-PT changed gradually from the rhombohedral perovskite structure to the tetragonal perovskite structure, while the cell volume decreased and the tetragonality (defined as the ratio of the cell parameters c/a) of the perovskite structure increased.The PFN-PT ceramics exhibited apparent dielectric frequency dispersion.With the increase of the PT content, the temperature of dielectric maximum Tm/TC increased, the dielectric response character changed from diffused and broad dielectric peaks to relatively sharper ones, the dielectric loss decreased, and the frequency dispersion became weak.The doping of MnO2 improved dielectric property of the PFN-PT ceramics effectively, in which the values of dielectric constant maximum εm and room-temperature dielectric loss tanδ were 13 254 and 0.003 63, respectively, at 100 kHz, and the values of saturation polarization Ps, coercive field Ec and piezoelectric constant d33 were 6.18 μC/cm2, 1.1 kV/mm and 98pC/N, respectively, of the 0.25％MnO2-doped 0.66PFN -0.34PT ceramics.关键词
铌铁酸铅-钛酸铅/钙钛矿/结构相变/电学性能Key words
lead iron niobate-lead titanate/ perovskite/ structural phase transition/ electrical property分类
化学化工引用本文复制引用
李乐庆,潘姗姗,方必军,杜庆柏,夏静,唐玲..铌铁酸铅-钛酸铅铁电陶瓷的结构相变[J].中山大学学报(自然科学版),2011,50(3):62-67,6.基金项目
安徽高等学校省级自然科学研究资助项目(KJ20108111) （KJ20108111）
江苏省高校自然科学研究计划资助项目(08KJB430001) （08KJB430001）
常州市科技局国际科技合作计划资助项目(CZ2008014) （CZ2008014）
