中文摘要：

用溶胶-凝胶法制备Z型钡铁氧体,将还原氧化石墨烯与Z型铁氧体复合制得Ba3Co2Fe24O41/石墨烯复合吸波材料,再用稀土La部分替代Ba制得Ba（2.7）La（0.3）Co2Fe（24）O（41）/石墨烯复合材料。测试材料的电磁性能及微波吸收性能发现,复合石墨烯可以大幅度提升Z型铁氧体的介电常数虚部及吸波性能,且La替代Ba后,样品的介电常数虚部和微波吸收量得到进一步提升。Ba（2.7）La（0.3）Co2Fe（24）O（41）/石墨烯复合材料平均微波吸收量由Z型铁氧体的22.30 d B增加到37.41 d B,吸收峰值由34.91dB增加到47.87dB,这使其成为一种很有潜力的吸波材料。

英文摘要：

Z type barium ferrite was prepared by sol-gel method, composited the reduced graphite oxide and Z type ferrite in order to get Ba3Co2Fe24O41/graphene, then partly replaced Ba by rare earth La, the composite Ba27La0.3Co2Fe4O41/graphene was obtained. It was found that the addition of graphene can greatly enhance the imaginary part of complex permittivity and absorbing properties. Moreover, the imaginary part of complex permittivity and absorbing properties of the composite partly replaced Ba by La were further enhanced. The average microwave absorption of Ba2.7La0.3Co2Fe24O41/graphene increased from 22.30 dB to 37.41 dB, and the absorption peak from 34.91 dB to 47.87 dB. This makes BazTLa0.3Co2Fe24O41/graphene become a promising material for absorbing materials.