Ca掺杂对多晶LuMnO_3结构和磁性的影响  

Influence of Ca Substitution on Structure and Magnetism of Polycrystalline LuMnO_3

作　　者：欧伟强[1] 陈熹[1] 何丽群[1] 

机构地区：[1]华南理工大学理学院,广州510006

出　　处：《材料导报》2014年第18期5-8,共4页Materials Reports

基　　金：国家自然科学基金(11174082)

摘　　要：使用固相反应法制备了Ca掺杂的多晶LuMnO3,其掺杂浓度为0≤x≤0.6,分别使用X射线衍射仪、拉曼散射仪以及物理性质测量系统对Lu1-xCaxMnO3多晶样品的结构、拉曼振动模式以及磁性进行了测量与分析。实验结果表明:当Ca掺杂含量x=0时,样品的结构为纯的六方相;随着x的增大,样品的结构逐渐从六方相向正交相转变;当x=0.5、0.6时,样品的六方相结构完全转变成纯的正交相。此外,样品的磁化强度在x=0.4时达到最大值,其原因是样品Mn3+与Mn4+之间的双交换作用在x=0.4处达到了峰值,使样品的铁磁性达到最强。Structural,vibrational and magnetic properties of Lu1-xCax MnO3 （0≤x≤0.6） prepared by solidstate method were studied by X-ray diffraction,Raman scattering,and physical properties measurement respectively.It was found out that the sample with x=0 was of the pure hexagonal phase; with increasing x,the hexagonal phase started to convert into the orthorhombic phase; for the x=0.5 and 0.6 samples,the hexagonal disappeared and completely converted into the orthorhombic phase.In addition,with x-=0.4,the magnetization reached a maximum because the double exchange interaction between Mn^3＋ and Mn^4＋ reached a maximum at x=0.4.

关 键 词：多铁材料 锰氧化物 结构相变 磁化强度 

分 类 号：O469[理学—凝聚态物理]