Ce和Ni共掺杂BiFeO_3薄膜的光学和铁磁性能  

Influence of Ce and Ni co-doping on structural,optical and magnetic properties of BiFeO_3 thin films

作　　者：崔金玉[1] 杨平雄[2] 褚君浩[2] 

机构地区：[1]营口理工学院机电工程系,辽宁营口115014 [2]华东师范大学信息科学技术学院电子系极化材料与器件教育部重点实验室,上海200241

出　　处：《红外与毫米波学报》2016年第3期322-325,331,共5页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金项目(61376129和61474045);国家重点基础研究项目(2013CB922300)~~

摘　　要：利用溶胶-凝胶工艺在石英衬底上制备了镍铈共掺杂铁酸铋Bi_(0.9)Ce_(0.1)Fe_(1-x)Ni_xO_3(xBCFNO,x=0,0.03,0.05,0.07)薄膜.X-射线衍射(XRD)测试表明所有样品的晶体结构都为四方钙钛矿铁酸铋BiFeO_3结构.由于Ce和Ni共掺杂,XRD显示,峰位置发生偏移.主峰(012/110)峰值在Ni含量x=0.05时峰值最大.扫描电子显微镜(SEM)测试也显示x=0.05时晶粒最大,结晶度最好.光学透射测试显示xBCFNO薄膜x=0.03时的光学禁带宽度最小,为2.14 eV.铁磁测试结果表明镍铈共掺杂可以进一步提高铁酸铋的室温铁磁性.Bi_(0. 9)Ce_(0. 1)Fe_(1-x)Ni_xO_3( xBCFNO,x = 0,0. 03,0. 05,0. 07) thin films were fabricated on SiO_2 substrates by sol-gel process. X-ray diffraction patterns indicate that all films exhibit a distorted pseudotetragonal perovskite structure with a high degree of( 012 /110) preferred orientation and peak position deviation. The intensity of( 012 /110) peak changes with the change of x with a maximum value at x =0. 05. Furthermore,the grain size become the biggest at x = 0. 05 revealed by scanning electron microscopy( SEM). The smallest band gap of xBCFNO films is 2. 14 eV at x = 0. 03 measured by the optical transmission spectra. The magnetic hysteresis( M-H) loops show that the room-temperature ferromagnetism was enhanced with Ce and Ni co-doping.

关 键 词：铁酸铋 镍铈共掺杂 光学特性 铁磁性 

分 类 号：O469[理学—凝聚态物理]