Co^(2+)掺杂W型铁氧体的制备和吸波性能研究

Study on Preparation and Microwave Absorption of Co^(2+)Doped W-type Ferrite

为解决单一铁氧体吸波材料吸波频带窄的问题,采用固相法制备了Co^(2+)掺杂的W型钡铁氧体Ba(Zn_(1-x)Co_(x))_(2)Fe_(16)O_(27)(x=0、0.2、0.4、0.6、0.8、1.0)铁氧体,研究了Co^(2+)掺杂对W型钡铁氧体晶体结构、微观形貌、电磁性能和吸收性能的影响。结果表明,随着Co^(2+)掺杂量的增加,铁氧体晶体结构保持不变,掺杂Co^(2+)的W型钡铁氧体具有六角片状结构。随着金属离子的加入,粒径有不同程度减小。当Co^(2+)掺杂的摩尔分数x为0.4时,铁氧体的磁损耗最高。含量为70%的Ba(Zn_(0.6)Co_(0.4))2Fe_(16)O_(27)铁氧体吸收涂层的最大反射损耗为-22 dB,峰值位置在12.5 GHz,反射损耗RL<-10 dB的带宽约为8 GHz(8~16 GHz),实现了宽频带强吸收。

In order to solve the problem of narrow absorption band of single ferrite absorbing material,Co^(2+)doped W-type barium ferrite Ba(Zn_(1-x)Co_(x))_(2)Fe_(16)O_(27)(x=0,0.2,0.4,0.6,0.8,1.0)was prepared by solid method.The effects of Co^(2+)doping on the crystal structure,microstructure,electromagnetic properties and absorption properties of W-type barium ferrites were investigated.The results show that the crystal structure remains unchanged with the increase of Co^(2+)doping.Co^(2+)doped W-type barium ferrite has a hexagonal plate-like structure.With the addition of metal ions,the particle size decreases varyingly.When the molar fraction x of Co^(2+)doping is 0.4,the magnetic loss of ferrite is the highest.The absorption coating of Ba(Zn_(0.6)Co_(0.4))_(2)Fe_(16)O_(27) ferrite with a content of 70% has a maximum reflectivity loss of -22 dB,peak position at 12.5 GHz,and a bandwidth about 8 GHz(8~16 GHz)with reflectivity loss RL<-10 dB,achieving broadband strong absorption.