M型永磁铁氧体的现状与进展  

Present States and Recent Advances in M-Type Ferrites

作　　者：刘先松[1] 都有为[1] 

机构地区：[1]南京大学物理系固体微结构国家实验室,江苏南京210093

出　　处：《磁性材料及器件》2001年第1期27-33,共7页Journal of Magnetic Materials and Devices

摘　　要：评述了 M型永磁铁氧体的现状与进展。讨论了 M型永磁铁氧体在工业生产中的关键技术问题 ,如预烧工艺、微粉加工、料浆在磁场成型时的取向。详细地调研了高性能锶铁氧体的化学成分、显微结构、宏观的和亚微观的磁性能。57Fe Mossbauer谱显示非化学计量的 M型永磁铁氧体性能与 4 f1与 4 f2 晶位谱线强度相关。La2 O3掺杂对稳定磁铅石结构和提高永磁体性能有益。La3+和 Zn2 +联合取代对 M型六角铁氧体晶粒取向度、质量密度、亚微米尺寸结构和饱和磁化强度有明显的作用 ,正像人们期望的那样 ,M型锶铁氧体的 Br和 (BH)Present states and recent advances in M type permanent ferrites are reviewed in this paper. The key technology for the manufacturing of M type ferrites with high performances such as pre sintering, micro crushing and magnetic orientating in pressing with magnetic field is discussed. This paper has described the promising ideas and processes in order to improve the properties of sintered M type magnets in industry in the future. Commercial high energy product strontium hexaferrites have in detail been characterized in tems of their chemical compositions, microstructures, and bulk and submicroscopic magnetic properties. 57 Fe Mssbauer spectroscopy shows that the magnetic properties of nonstoichiometric M Type ferrites correlates with the relative intensity of the pattern assigned to the 4f 1 and 4f 2 sites. The La 2O 3 additiion to SrO·6Fe 2O 3 is very useful in stabilizing the magnetoplumbite structure and these Sr La system ferrites have excellent properties as a permanent magnet. Lanthanum and zinc substitution in M type hexaferrite can achieve high orientation degree,high mass density, submicronsized grains and high saturation magnetization. The B r and ( BH ) max has greatly advanced in M type Sr ferrites as hoped.

关 键 词：M型永磁铁氧体 显微结构 磁性能 

分 类 号：TM277[一般工业技术—材料科学与工程]