Fe替代Mn对Mn2Dy化合物的结构和磁相关性能的影响  

Structure and Magnetic Properties of (Mn1-xFex)2Dy Compounds with Fe Dopping

作　　者：郭永斌 马垒[1,2] 赵世谦 周良[1] 刘涛[1] 王岛[1] 

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西桂林541004 [2]桂林电子科技大学广西信息材料重点实验室,广西桂林541004

出　　处：《稀有金属》2018年第2期220-224,共5页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51461012);桂林电子科技大学-中铝广西有色金源稀土有限公司研究生联合培养基地专项经费资助项目(20160513-12-Z);广西信息材料重点实验室项目(161011-Z)资助

摘　　要：采用真空氩弧熔炼的方法制备了（Mn1-xFex）2Dy（x=0-1.0）系列样品,在800℃下进行热处理10 h,利用X射线衍射仪（XRD）、综合物性测量系统（PPMS）、电阻应变片法等测试方法系统研究了不同Fe替代量对Mn2Dy化合物的结构演变、磁性能和磁致伸缩性能的影响。研究结果表明,Mn2Dy化合物具有典型的Mg Cu2（C15型）面心立方（fcc）晶体结构,随着Fe替代量x的增加,（Mn1-xFex）2Dy化合物的晶胞体积和晶胞参数a,b,c逐渐减小,但始终保持fcc晶体结构不变;Mn2Dy化合物为反铁磁体,当Fe替代量x〉0.5时,该化合物开始由反铁磁性向铁磁性转变,饱和磁化强度（Ms）可在-6.0-80.0 Am2·kg^-1之间调控;反铁磁Mn2Dy几乎不显示磁致伸缩性能,随着Fe替代量的增加,磁致伸缩系数（λ）逐步提高且灵敏度越来越高,当x=0.9时在72 kA·m^-1外场下λ最高可以达到350×10^-6。机制探讨表明,铁磁性的Fe元素替代Mn后改变了Mn2Dy化合物的磁晶各向异性与磁性,从而影响了磁致伸缩性能。The （Mn1-xFex）2Dy （ x = 0 - 1.0） samples were prepared by vacuum argon art： melting method, then annealed at 800 ℃ for 10 h, and the effects of dilterent Fe substitutions on the structural evolution, magnetic properties and magnetostriction performance of Mn2Dy compounds were investigated by X-ray diffraction （XRD） , physical property measurement system （PPMS） anti resistance strain gage method. The results showed that the crystal structure of Mn2Dy eompound was MgCu2 （C15 type） , which was face-centered cubic （fee） phase. The unit cell volumes and lattice parameter a, b, c of （Mn1-xFex）2Dy compounds decreased gradually with the increase of x, but crystal structure kept the fcc structure. Mn2Dy compound was antiferromagnets, nevertheless, the magnetic type of （Mn1-xFex）2Dycompounds began to transform front antiferromagnetism to ferromagnetism when x 〉 0. 5, and the saturation magnetization （M） could be controlled between - 6.0 - 80.0 Am^2·kg^-1 . The antiferromagnetie Mn2Dy showed almost no magnetostriction performance. With the increase of Fe-substitution, the magnetostriction coefficient （A） increased gradually anti the sensitivity was improved. When x =0.9, the maximum of a could reach 350 × 10^-6 at 72 kA·^m-1 external magnetic field. The mechanism analysis showed that the substitution of Fe changed the magnetocrystalline anisotropy and magnetic properties of Mn, Dy compound, and then affeeted the magnetostriction performance.

关 键 词：Mn2Dy Fe2Dy 磁致伸缩 磁性能 

分 类 号：TG111.92[金属学及工艺—物理冶金]