摘要
用固相法制备Fe_(2)W型(BaFe_(2)^(2+) Fe_(16)^(^(3+))O_(27))六角铁氧体材料。用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析其微结构,并采用Reitveld软件对样品晶体结构进行拟合。用X射线光电子能谱仪(XPS)分析其元素价态,用振动样品磁强计(PPMS-VSM)和FE-2100H永磁仪测试其磁特性。结果表明,样品的XRD谱无杂相,特别是无α-Fe_(2)O_(3)。SEM观察表明晶粒分布均匀并呈良好的六角形结构。XPS分析表明,固相法在氮气保护的情况下能使部分Fe^(3+)转化为Fe^(2+),试验的可行性得到证实。VSM测试表明,与M型铁氧体相比,300 K下材料的饱和磁化强度(Ms)高出19.6%。FE-2100H永磁仪测量表明,磁体的剩磁Br随测量温度的上升而下降,矫顽力随测量温度的上升而增大。然而,本工作只是初步研究,材料性能低于不具大生产能力的超低氧分压氮气烧结文献[6]报道的Fe_(2)W的性能。磁能积仅及其34%~39%;Br仅及其53%~57%,矫顽力也低。今后在提高取向度、增强防氧化力度、提高单畴晶粒占比等方面有待进一步研究。
W-type hexagonal ferrite Fe2W(BaFe_(2)^(2+) Fe_(16)^(^(3+))O_(27))was prepared by solid phase method.X-ray diffraction(XRD)and scanning electron microscope(SEM)were used to analyze the microstructure,and Reitveld software was used to fit the crystal structure of the samples.The elemental valence states were analyzed by X-ray photoelectron spectroscopy(XPS),and the magnetic properties were measured by vibrating sample magnetometer(PPMS-VSM)and FE-2100H permanent magnet instrument.The results show that the XRD spectra of the samples have no impurity phase,especially noα-Fe2O_(3).SEM observation shows that the grain distribution is uniform and has a good hexagonal structure.XPS analysis shows that part of Fe^(3+)can be converted to Fe2+by solid phase method under nitrogen protection,and the feasibility of the experiment has been confirmed.VSM test shows that the saturation magnetization(Ms)at 300 K is 19.6%higher than that of M-type ferrite.The analysis of FE-2100H permanent magnet instrument shows that the remanence Br of the magnet decreases and the coercivity increases with the increase of the measured temperature.
作者
陈东雯
唐锦
李丹
黄伟超
CHEN Dong-wen;TANG Jin;LI Dan;HUANG Wei-chao(China Al Guangxi None-ferrous Metals Jinyuan Rare-earth Co,Ltd,Hezhou 542603,China;Research Center of Materials Science and Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China;Center of Experimental Teaching for Common Courses,Panzhihua University,Panzhihua 617000,China)
出处
《磁性材料及器件》
CAS
CSCD
2022年第1期19-23,共5页
Journal of Magnetic Materials and Devices
基金
广西科技基地和人才专项资助项目(桂科AD19245013)
广西科技大学博士基金项目(校科博19Z29)。
关键词
W型六角铁氧体
固相法
微观结构
磁特性
W-type hexagonal ferrite
solid phase method
microstructure
magnetic properties
