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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Ba_3Co_2Fe_(24)O_(41)/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)Co_2Fe_(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)Co_2Fe_(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 dB增加到37.41 dB,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。
Z-type barium ferrite was prepared by sol-gel method, Ba_3Co_2Fe_ (24) O_ (41) / graphene composite absorber was prepared by the combination of reduced graphene oxide and Z-type ferrite, Ba (2.7) La_ (0.3) Co_2Fe_ (24) O_ (41) / graphene composites were prepared. The electromagnetic properties and microwave absorption properties of the tested materials show that the composite graphene can greatly enhance the imaginary part and the microwave absorbing property of the Z-type ferrite. When La is substituted for Ba, the imaginary part of the permittivity and microwave absorption The amount has been further enhanced. The average microwave absorption of Ba_ (2.7) La_ (0.3) Co_2Fe_ (24) O_ (41) / graphene composites increased from 22.30 dB to 37.41 dB for Z-type ferrite, and the absorption peak increased from 34.91 dB to 47.87 dB Making it a promising microwave absorbing material.