纳米六角晶型吸波铁氧体的制备与性能研究

电磁辐射污染是当代社会中一个日渐增长的环境问题.它主要集中在微波波段.通常克服电磁污染的方法有屏蔽和吸收.铁氧体是一种较为常用的微波吸收材料.为了获得高性能的微波吸收材料,采用柠檬酸盐溶胶-凝胶法来制备掺杂有金属离子的纳米六角晶型铁氧体.铁氧体的晶型通过X衍射得到证实,晶粒尺寸则通过原子力显微镜验证.最后测试了该铁氧体的吸波能力.微波场中强度的分贝损耗在10～25dB.它能够有效地吸收环境中的电磁波.

Nanophase Hexagonal Ferrite for Microwave Absorption: Preparation and Performance Research

Electromagnetic pollution is an increasing environmental problem in modern society. The pollutioncomes mainly from microwaves. The general methods to conquer it are shielding and absorpition. Ferrite is an ordinary material used to absorb microwave. This study adopted the citrate Sol-gel method to prepare the nanophase hexagonal ferrite with doping metal to get high performance microwave materials. The crystal style of the ferrite was confirmed by XRD and the grain size of the particle is measured by atomic force microscope (AFM). Finally the absorbency of this ferrite was tested. The dB-loss of microwave intensity field was between 10~25 dB. It has proved to be an effective material to absorb environmental microwave.