BaTiO_3陶瓷中La-Er缺陷复合体形成的研究  

Study on Formation of La-Er Defect Complexes in BaTiO_3 Ceramics

作　　者：袁龙飞[1,2] 路大勇[1] 

机构地区：[1]吉林化工学院材料科学与工程研究中心,吉林吉林132022 [2]吉林大学化学学院,吉林长春130021

出　　处：《吉林化工学院学报》2015年第1期69-72,共4页Journal of Jilin Institute of Chemical Technology

基　　金：国家自然科学基金项目(No.21271084);吉林省科技发展计划项目(No.20121825)

摘　　要：采用X射线衍射(XRD)、拉曼光谱(RS)和电子顺磁共振(EPR)技术研究Ba Ti O3陶瓷中Ba/Ti比率变化对4%La3+-Er3+缺陷复合体形成的影响.结果表明:Ba/Ti比率的微小变化对陶瓷的晶体结构产生巨大的影响,并影响La3+-Er3+缺陷复合体的形成.具有Ba/Ti=1的陶瓷显示单相立方钙钛矿结构,意味着La3+-Er3+缺陷复合体的形成;Er的双性行为导致微量Er3+离子不可避免地进入Ba位,并导致Ti空位缺陷的存在.当Ba/Ti=1.01时,在主钙钛矿相中有少量Ba12Er4.67Ti8O35相析出.而Ba/Ti=0.99的样品形成了不同于钙钛矿结构的一种全新的结构.The influence of Ba / Ti ratio on formation of 4% La3 ＋-Er3 ＋defect complexes in Ba Ti O3 ceramics was studied using X-ray diffraction（ XRD）,Raman spectroscopy（ RS）,and electron paramagnetic resonance（ EPR） techniques. The results indicate that slight variations in the Ba /Ti ratio have a great effect on the crystal structure of ceramics and the formation of La3 ＋-Er3 ＋defect complexes. The ceramic with Ba / Ti = 1shows a single-phase cubic perovskite structure,which means the formation of La3 ＋-Er3 ＋defect complexes. An amphoteric behavior of Er gives rise to inevitable Ba-site occupations by a small number of Er3 ＋ions,and presence of Ti-vacancy defects. When Ba / Ti = 1. 01,a small amount of a secondary phase Ba12Er4. 67Ti8O35 is present in the main perovskite phase. A novel structure is formed in the ceramic with Ba / Ti = 0. 99,which is different from the perovskite structure.

关 键 词：钛酸钡陶瓷 缺陷复合体 结构相变 X射线衍射 电子顺磁共振 拉曼光谱 

分 类 号：O614.23[理学—无机化学]