Yb在BaTiO_3陶瓷中的缺陷化学  

Research on site occupation of Yb in BaTiO_3

作　　者：蔡倩[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》2014年第5期107-110,共4页Journal of Jilin Institute of Chemical Technology

基　　金：吉林省科技发展计划项目(20121825)

摘　　要：采用冷压陶瓷技术制备了名义分子式为(Ba1-xYbx)Ti1-x/4O3(x=0.005,0.01,0.015)的陶瓷.由X射线衍射(XRD)、扫描电镜(SEM)、拉曼光谱(RS)和电子顺磁共振(EPR)技术调查该陶瓷的缺陷化学.结果表明:该陶瓷的固溶度为x=0.01,且陶瓷具有单相四方钙钛矿结构;当x=0.015时,有少量Yb2Ti2O7相析出.在x=0.005时,Yb占据Ba位并形成Ti空位缺陷.当x增加到0.01时,Yb开始进入Ti位,但并不能完全填充Ti空位,导致Ba空位和Ti空位缺陷的共存.The cold-pressing ceramic technique was used to prepare normal （Ba1-xYbx） Ti1-x/4 03 （x = 0. 005,0. 01,0.015） ceramics. The defect chemistry, of these ceramics was investigated using X-ray diffraction （XRD）, Scanning electron microscopy （SEM）, Raman spectroscopy （RS）, and Electron paramagnetic resonance （EPR） techniques. The results indicated that the solid solubility of Yb in BaTiO3 was x = 0.01 and the ceramics had a single-phase tetragonal perovskite ceramic. A small amount of Yb：Ti2O7 was separated out when x = 0. 015. Yb prefered Ba-site to Ti-site,which leads to the formation of Ti vacancies when x = 0. 005. As x was increased to 0.01, Yb ions entered Ti-sites in part but could not completely filled Ti vacancies when x = 0. 01 ,which leads to the coexistence of Ba-and Ti-vacancy defects.

关 键 词：钛酸钡陶瓷 固溶性 位占据倾向 缺陷 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]