M型钡铁氧体的制备及其在微波器件中的应用

Preparation of M-type barium ferrite and its application inmicrowave devices

M型钡铁氧体(BaFe_(12)O_(19),BaM)是一种优越的六角晶系永磁材料,具有高饱和磁化强度、高磁各向异性、高剩磁比等优点。这不仅对自偏置环行器的开发和制造具有重要的促进作用,而且使得未来微波天线的微型化进程以及新波段雷达的开发更容易实现。另外,M型钡铁氧体还是一种典型的双复介质磁性材料,具有良好的电磁损耗与共振吸收特性,利用这一点可以制作出性能优异的吸波材料,并应用于生活中的有害电磁波屏蔽和军用战机的隐身技术。因此,M型钡铁氧体材料的开发和利用无论是对未来的民生生活还是军用技术都有着深远的影响意义。文中主要针对近年来M型钡铁氧体的常用制备方法进行了讨论和综述,尤其是M型钡铁氧体单晶材料的制备。另外也系统介绍了M型钡铁氧体的晶体结构和其作为磁性元件在微波器件中的应用。

M-type barium ferrite(BaFe_(12)O_(19),BaM)is an excellent hexagonal permanent magnet material with high saturation magnetization,magnetic anisotropy and remanence ratio.It not only plays an important role in promoting the development and manufacture of self-biased circulators,but also makes the miniaturization process of microwave antennas and the development of new band radar easier to achieve in the future.In addition,M-type barium ferrite is also a typical double-dielectric magnetic material with good electromagnetic loss and resonance absorption characteristics.It can be used to fabricate absorbing materials with excellent performance,which can be used for harmful electromagnetic wave shielding in life and stealth technology of military aircraft.Therefore,the development and utilization of M-type barium ferrite materials have far-reaching influence on the future people s livelihood and military technology.In this paper,the common preparation methods of M-type barium ferrite in recent years are discussed and reviewed,especially the preparation of M-type barium ferrite single crystal materials.In addition,the crystal structure of M-type barium ferrite and its application as magnetic element in microwave devices are also introduced.