六角晶系铁氧体纳米晶微波吸收剂的微结构与磁性能  

Microstructure and Magnetic Properties of Hexagonal Ba-ferrite Nanocrystal Microwave-absorbing Agents

作　　者：徐劲峰[1] 郭方方[1] 徐政[1] 

机构地区：[1]同济大学材料学院,上海200092

出　　处：《磁性材料及器件》2005年第1期20-22,28,共4页Journal of Magnetic Materials and Devices

摘　　要：采用柠檬酸盐溶胶-凝胶法制备了Z型平面六角铁氧体纳米晶,并对其进行离子取代和稀土掺杂.采用X射线衍射 (XRD)、透射电镜 (TEM)对其物相组成、显微结构进行研究.发现在1250～1275℃焙烧温度下就可形成均匀单一的铁氧体纳米晶;磁性能和吸波特性研究表明,纳米晶的磁性能和吸波特性明显优于传统方法制备的铁氧体粉末.在X波段(8～12GHz)和Ku波段(12～18GHz)Co2-Z型铁氧体有多个吸收峰,最大吸收量达65dB,10 dB带宽达到6.5GHz,说明这是一种优质的宽频微波吸收材料.Citrate sol-gel process was used to prepare Z-type ion substituted hexagonal Ba-ferrite nanocrystals. X-ray diffractometry (XRD), transmission electron microscopy (TEM) were used to study the microstructure and crystallization process. It was found that the uniform and single phase Ba-ferrite nanocrystals can be obtained at firing temperature of 1250℃~1275℃; the magnetic and microwave-absorbing properties were obviously superiorior to that of normal ferrite powder prepared by traditional method. Several absorption peaks were observed in the frequence range of X-band (8~12GHz) and Ku-band (12~18GHz) with a maximal absorption of 65dB and 10 dB bandwidth of 6.5 GHz, which indicates that the materials can be used as wide-band absorbers.

关 键 词：Z型六角晶系钡铁氧体 纳米晶 柠檬酸盐溶胶-凝胶法 磁性能 微波吸收 

分 类 号：TM277[一般工业技术—材料科学与工程] O482.5[电气工程—电工理论与新技术]