Ba掺杂多铁BiFeO₃陶瓷的制备及性能

Ba掺杂多铁BiFeO 3 陶瓷的制备及性能 The Synthesis and Characterization of Ba-Doped Mutiferroic BiFeO 3 Ceramics 庞志鹏 PANG Zhipeng 1 first-author 刘小莲 LIU Xiaolian 1 胡忠强 HU Zhongqiang 1 魏茂才 WEI Maocai 1 赵猛 ZHAO Meng 1 李美亚 LI Meiya 1 武汉大学物理科学与技术学院/人工微结构教育部重点实验室 武汉大学物理科学与技术学院/人工微结构教育部重点实验室 School of Physics and Technology/Key Laboratory of Artificial Micro of Nano Structures of Ministry of Education,Wuhan University School of Physics and Technology/Key Laboratory of Artificial Micro of Nano Structures of Ministry of Education,Wuhan University 采用固相法成功地制备出了Ba掺杂多铁BiFeO3（BFO）的Bi1-x Bax FeO3（x=0.1,0.15,0.2,0.3）陶瓷,研究了Ba掺杂含量对陶瓷结构、铁电、漏电以及磁性的影响,制得的陶瓷为菱形扭曲的钙钛矿结构,属于R3c空间群,Ba掺杂含量较高时会转变为赝立方结构;随着Ba掺杂含量的升高,铁电电滞回线的矩形度变好,漏电流密度减小.当x=0.3时,电滞回线的矩形度最好,漏电流密度最小,其值为8×10-6 A/cm2,与纯相BFO陶瓷相比,下降了两个数量级.磁性测试表明,Bi1-x Bax FeO3陶瓷具有饱和的磁滞回线,随Ba掺杂浓度的增加,其剩余磁性经历了一个先增大后下降的过程,其最大剩余磁化强度可达9emu/g.Ba掺杂显著地改善了BFO陶瓷的铁电性和磁性. Bi1-x Bax FeO3（x=0.1,0.15,0.2,0.3）has been prepared by solid state reaction,and the effect of Badoping on the structure,dielectric,ferroelectric and the magnetic properties of the BiFeO3（BFO）were investigated.XRD results shows that Bi1-x Bax FeO3 is hombohedral distorted perovskite structure with space group R3c.For x=0.3,a structure transition from rhombohedral R3cto pseudo-cubic is observed.With the increase of xfrom 0.1to0.3,ferroelectric hysteresis loops become much more rectangular and leakage current decrease a lot.For x=0.3,the samples have the best ferroelectric hysteresis loops and smallest leakage current,which is of about 8!10-6 A/cm2,much smaller than that of the pure BFO.Magnetic hysteresis loops was saturated with a largest remnant magnetization up to 2emu/g.The ferroelectricity and magnetism of Ba-doped BFO were significantly improved through Ba-doping. Ba掺杂 多铁BFO陶瓷 铁电性 磁性 固相法 Ba-doped mutiferroic BiFeO3 ceramics ferroelectricitiy magnetism solid state reaction 10.14188/j.1671-8836.2014.02.007 TQ174 国家自然科学基金资助项目（11074193） 2014-02-01 2021-04-01 2 60