La_(0.9)Sb_(0.1)Mn_(1-x)Ti_xO_3(x=0,0.05,0.10,0.15,0.20)的晶体结构及磁学性质  

Crystal Structures and Magnetic Properties of La_(0.9)Sb_(0.1)Mn_(1-x)Ti_xO_3(x=0,0.05,0.10,0.15,0.20)

作　　者：张丽[1] 刘建[1] 张桂荣[1] 延佳[1] 王鸿钰[1] 

机构地区：[1]内蒙古大学物理科学与技术学院,呼和浩特010021

出　　处：《内蒙古大学学报（自然科学版）》2012年第4期389-393,共5页Journal of Inner Mongolia University：Natural Science Edition

基　　金：国家自然科学基金资助项目(61141006);内蒙古自治区自然科学基金资助项目(2011MS0111)

摘　　要：采用固相反应法制备了钙钛矿锰氧化物La0.9Sb0.1Mn1-xTixO3(x=0,0.05,0.10,0.15,0.20)的多晶样品.X射线衍射(XRD)表明,样品仍为正交钙钛矿结构.扫描电镜(SEM)观测结果表明,随着掺杂量的增加,晶胞体积增大,间隙增大,但仍为规则的立方晶格结构.所有样品在598-606cm-1范围内出现了红外吸收光谱.且随着掺杂量的增加,光谱向高频移动.样品的磁电阻(MR)表明对材料进行B位微量掺杂,对提高其磁性质有明显作用.Manganite perovskite polycrystalline samples of La0.9Sb0.1Mn1-xTixO3(x=0,0.05,0.10,0.15,0.20)were prepared by solid phase reaction method.The X-ray diffraction investigation shows that all compounds are in single phase with orthorhombic lattice(Pnma space group).SEM results show that the polycrystalline grains and crystale gaps increase when the Ti content increases.The samples 'infrared absorption spectra have been measured at room temperature and all samples appear the absorption at range of 598-606cm-1.The peak moves from a lower frequency to a higher frequency with increasing the Ti4+ concentration x.The concentration of doping Ti ions has an important effect on magnetoresistance(MR).

关 键 词：La0.9Sb0.1Mn1-xTixO3 晶格结构 扫描电镜 磁性质 

分 类 号：O48[理学—固体物理]