Preparation and Microwave Absorbing Properties of Nano-rod Barium Ferrite

The nano-rod of barium ferrite was made of iron nitrate and barium nitrate as raw materials by combustion method of sol-gel and self-propagation.The composition,morphology and magnetic properties of barium ferrite nano-rod were characterized by X-ray diffraction analysis,transmission electron microscopy and vibrating sample magnetometer.The cement-based composite absorption materials of doping barium ferrite nano-rod was prepared,and its microwave absorbing properties were measured by reflection method.The results indicate that the average particle size and length of barium ferrite nano-rod are 40 - 60 nm and 100 nm respectively,the saturation magnetization and coercivity are 49.87 A ? m~2/kg and 63.1 A/ m.When the contents of barium ferrite nano-rod in cement reaches 1.83%(by mass) and thickness of specimen is 20 mm,the least reflectivity of cement-based composite is -16.78 dB and bandwidth for-10 dB reaches 6 GHz in 2 - 18 GHz frequency range.