空穴掺杂Sr_2FeMoO_6的晶体结构及磁性研究  

Hole doping effects on structure and magnetic properties of Sr_2FeMoO_6

作　　者：胡艳春[1,2] 王艳文[3] 张克磊[1] 王海英[1] 马恒[1] 路庆凤[1] 

机构地区：[1]河南师范大学物理与信息工程学院,新乡453007 [2]河南省光伏材料重点实验室,新乡453007 [3]新乡医学院生命科学技术系,新乡453003

出　　处：《物理学报》2012年第22期314-319,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11074066);河南师范大学博士科研启动金(批准号:01026500109);河南省科技厅科技攻关项目(批准号:102102210186)资助的课题~~

摘　　要：采用传统高温固相反应法制备了空穴掺杂的系列样品Sr2xKxFeMoO6(0x0.04),研究了其晶体结构和磁性质.X射线粉末衍射结果表明该系列样品均为单相,四方晶系,空间群为I4/m.碱金属K的含量可以调控反位缺陷的浓度.未掺杂样品Sr2FeMoO6在280K时的原胞磁矩为1.12μB.掺杂量为x=0.04样品的原胞磁矩为1.26μB.阳离子有序、晶格畸变是影响Sr2xKxFeMoO6磁性的重要因素.Samples of Sr2-xKxFeMoO6 （x = 0, 0.01, 0.02, 0.03, 0.04） are prepared by standard solid-state reaction. The crystal structures and magnetic properties for the ordered double perovskite oxides Sr2xKxFeMoO6（0≤x≤0.04） are investigated. X-ray powder diffraction studies reveal that all the samples are of single phase and each of them has a I4/m symmetry. The anti-site defects in double perovskite oxides of SrzFeMoO6 may be adjusted by alkali metal element of K doping. The unit cell magnetizations at 280 K are 1.12μB for x = 0.00 and 1.26#B for x = 0.04. The cation-ordering and the variation of structure parameters play improtant roles in determining the magnetism in the doping system.

关 键 词：X射线粉末衍射 晶体结构 空穴掺杂 磁性材料 

分 类 号：O611.4[理学—无机化学]