| Summary: | 碩士 === 國防大學中正理工學院 === 應用化學碩士班 === 99 === Based on the strong magnetic properties of cobalt ferrites and nickel ferrites, both were used in this study to combine with organic substrate to form composite materials of the advanced electromagnetic absorbers at GHz range.The spinel ferrites of CoxNi1-xFe2O4 ,( x＝0,0.2,0.4,0.6,0.8,1.0 ),were synthesized by using aqueous combustion synthesis. The sol-gels, as-burnt powers and the final powers of the cobalt-nickel ferrite were characterized by XRD, FT-IR,SEM and VSM. The microwave absorption properties of β-SiC/ spinel ferrite/ nano carbon tube or nano carbon black/rubber composites were measured by the Vector Net-work Analyzer. Our results indicated that the highest saturated magnetization (Ms), the highest remanent magnetization (Mr), and the coercivity (Hc) of the spinel Co0.6Ni0.4Fe2O4 after heating at 900℃ were 109.35(emu/g), 46.291(emu/g), and 747.470(Oe), respectively.In addition , the composite materials，with the thickness of 2.0 mm ， prepared by mixing 50g of β-SiC , 7.5g of Co0.6Ni0.4Fe2O4 ， 2.5g carbon black， and 40g rubber，exhibited a reflection loss of -32.8 dB within the freguency range of 10.24 GHz to 11.19 GHz.
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