Abstract: The ceramic marerial of barium titanate (BT) was synthesized by a sol-gel method. The mircrostructure and morphology of the powders were characterized by IR, XRD and TEM. The dielectric constant and permeability of the mixture of BT powders and paraffin wax were measured. The microwave absorbing performance of BT powder and epoxide (EP) resin composite was studied in the frequency range of 8--18GHz. The results show that the BT powder exists in the form of tetragonal phase with the size in the range of 30--40nm. The BT/EP composite exhibits good microwave absorbing performance in the frequency range of 8--18GHz, when the content of BaTiO₃ is 20vol%, the performance is the best. The microwave absorption mechanism of BaTiO₃ powders is mainly due to the dielectric relaxation. The BT powder will be a good candidate for microwave absorbing materials.

Key words: ceramic material, barium titanate, dielectric properties, microwave absorption mechanism