Abstract: Barium ferrite encapsulated porous glass particles(BEPG)were prepared with a citrate sol-gel method. The precursors were obtained from barium nitrate,citric acid and porous glass particles and then calcined at 850℃ for 2h with 60℃/h heating rate. The microstructure, complex dielectric constant, complex permeability and microwave absorption of the production were tested by X-ray diffraction, scan election microscope (SEM) and network analyzer. It was found that the BaFe₁₂O₁₉ crystal coated the porous glass particles surfaces well, which in turn exhibited the microwave absorption property. Microwave absorber coating of BEPG with 1.8mm thick was made with latex matrix and the reflection loss was more than -8dB at the range of 5～18GHz. The peak of reflection losses was -15dB at 6 GHz.

Key words: porous glass particles, hexagonal ferrite, complex dielectric, complex permeability, microwave absorption