溶胶-凝胶自燃烧法制备Ba(NiMg)_(0.2)Al_xFe_(11.4-x)O_(19)的结构与磁性能  

Structure and Magnetic Properties of Ba(NiMg)_(0.2)AlxFe_(11. 4-x)O_(19) Prepared by Sol-gel Auto-combustion Method

作　　者：常靖宇 孔迪 马振振 刘先松[2] 李明玲 

机构地区：[1]巢湖学院化学与材料工程学院,合肥238000 [2]安徽大学物理与材料科学学院,合肥230601 [3]巢湖学院新型功能材料与精细化学品研究所,合肥238000

出　　处：《人工晶体学报》2017年第9期1786-1790,共5页Journal of Synthetic Crystals

基　　金：2016年度国家级大学生创新创业训练计划项目(201610380018);安徽高校自然科学研究项目(KJ2017A447)

摘　　要：以柠檬酸为络合剂,利用溶胶-凝胶自燃烧法制备了Ni、Mg、Al掺杂的M型钡铁氧体粉体(Ba(Ni Mg)0.2AlxFe11.4-xO19,x=0~0.4),利用X射线衍射仪、透射电子显微镜、综合物性测量系统等对样品结构与室温磁性能进行研究。结果表明,样品的物相组成与Al掺杂量有密切关系,当Al掺杂量x超过0.2时,产物中出现杂相α-Fe2O_3,且杂相α-Fe2O_3的含量随x值的增大而增加。在10 k Oe的外加磁场下,样品的饱和磁化强度(Ms)随x值的增大而降低,矫顽力(Hc)则随x值的增大先增大后减小,当x=0.2时,矫顽力达到最大值5644 Oe,对应的饱和磁化强度为46 emu/g。The Ni,Mg,Al co-doped M-type barium ferrite powders（ Ba（NiMg）（0.2）AlxFe（11.4-x）O（19）,x = 0-0. 4） were prepared via a sol-gel auto-combustion method using citric acid as complexing agent. The structure and room-temperature magnetic properties of the as-samples were studied by X-ray diffraction（ XRD）,transmission electron microscope（ TEM） and physical property measurement system（ PPMS）.The results show that the phase constitutent of the samples is closely related to the amount of Al doping.When the x value exceeds 0. 2,the impurity alpha-Fe2O3 appears in the products,and the content of alpha-Fe2O3 increases with the increase of the amount of Al substitution. The saturation magnetization（ 10 k Oe） decreases with the increase of x value,while the coercivity（ Hc） value increases first and then decreases with the increase of x value,and the coercivity reaches the maximum value of 5644 Oe at x =0. 2,corresponding to the saturation magnetization of 46 emu/g.

关 键 词：钡铁氧体 溶胶-凝胶自燃烧法 离子掺杂 晶体结构 磁性能 

分 类 号：TB34[一般工业技术—材料科学与工程]