Abstract: Nanocrystalline oxide compound Ba(Zn1－xCox)2Fe16O27 has been synthesized using PEG gel method. The products are characterized by means of X-ray powder diffraction analysis. Based on a two-layer structure, the Ba(Zn1－xCox)2Fe16O27 powder is integrated with the traditional microwave absorbing material, iron particle, to form the absorbing coatings. The experimental result indicates that the composite materials have a good absorbing property. The absorptive mechanism of nanocrystalline material has also been discussed.

Key words: Microwave absorption, Composite material, Barium ferrite, Nanocrystal