The Effect of the Microstructure on the Microwave Absorption Properties of Fe-SiO<SUB>2</SUB> Nanogranular Powder

Nano-sized processing is reported to realize distinctive features in physical properties. We found a remarkable microwave absorption property caused by the increase of permeability and permittivity when nanogranulating ferromagnetic metals (Fe) and high electrical resistance ceramics (SiO2) in the frequency range of GHz. In this paper, we report the microwave absorption properties is effected by the dispersion state of Si-oxides in Fe-SiO2 nanogranular powder and the improvement of the microwave absorption properties by nanocompositing Fe and SiO2 is caused by the diffusion between Fe nanocrystal grains and amorphous Si-oxides in MA process.