(Nd_(1-x)MM_(x))-Fe-B烧结磁体的磁性能与畴结构  

Magnetic properties and domain structure of(Nd_(1-x)MM_(x))-Fe-B sintered magnets

作　　者：盖鹏祥 马强[1,2] 刘飞 刘艳丽 张雪峰[1] 白锁[1] GAI Pengxiang;MA Qiang;LIU Fei;LIU Yanli;ZHANG Xuefeng;BAI Suo(School of Science,Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi Metallic Resources:Elected State Key Laboratory,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学理学院,内蒙古包头014010 [2]内蒙古科技大学内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010

出　　处：《功能材料》2021年第8期8216-8220,共5页Journal of Functional Materials

基　　金：内蒙古自然科学基金资助项目(2018LH05011);内蒙古高等学校科学技术资助项目(NJZY17169)。

摘　　要：利用混合稀土(MM)结合双主相工艺制备名义成分为(Nd_(1-x)MM_(x))-Fe-B(x=0,0.3,0.5,0.7,1)的烧结磁体,磁体的磁性能随着MM含量的增加而降低。通过XRD测量结果可以发现随着MM含量的增加,(Nd_(1-x)MM_(x))-Fe-B烧结磁体中的相组成为2∶14∶1结构。当MM含量达到30%(质量分数)时,出现REFe_(2)相的衍射峰,并且随着MM含量的增加,衍射峰的强度也随之增强。对(Nd_(0.5)MM_(0.5))-Fe-B烧结磁体的微观形貌,元素分布以及磁畴结构进行原位分析,含MM的磁体中有La、Ce元素扩散至部分Nd-Fe-B主相晶粒中。用磁光克尔显微镜观察平行于c轴的样品表面,未添加MM的磁体的畴结构为条形畴,而添加MM的磁体有部分晶粒的畴结构趋向于迷宫畴,且随着La、Ce元素含量增多趋势越明显,同时发现在缺乏富稀土相的晶粒之间有穿晶畴的形成。The(Nd_(1-x)MM_(x))-Fe-B(x=0,0.3,0.5,0.7,1)sintered magnets were prepared in this paper by the method of two main phases with Misch-Metal(MM).The magnetic properties decreased with the increase of MM content.The XRD results show that the phase composition of(Nd_(1-x)MM_(x))-Fe-B sintered magnet was still 2:14:1 with the increase of MM content.However,ReFe_(2)phase appeared when the MM content reached 30 wt%and the intensity of the diffraction peak of ReFe_(2)also increased with the increasing MM content.The micro morphology,element distribution and domain structure of(Nd_(0.5)MM_(0.5))-Fe-B sintered magnet were analyzed by SEM-EDS,and the results shows that La and Ce elements diffused into some Nd-Fe-B main phase grains in MM containing magnets.The domain structure of the magnet without MM possessed standard bar domains observed by magneto-optical Kerr microscope,while the domain structure of magnet grains with MM tended to maze domains and La and Ce addition promoted the maze domain structure formation.In addition,it is found that transgranular domains were easy to form between the grains lacking rare earth rich phase.

关 键 词：(MM Nd)-Fe-B 烧结磁体 磁性能 磁畴 

分 类 号：O469[理学—凝聚态物理]