Studies On The Preparation And Microwave Absorbing Properties Of Ni_0.5Zn_0.5Fe₂O₄ Ferrite-Based Nanocomposite Materials

The study of microwave absorbing material applying to military stealth information and environment protection is an important research project. Ferrites absorbing material is one of the studied materials. The recent development in absorber technology is to produce absorbers which are strong, wide, thin, light, corrosion resistant and lowcost. However, there is no such kind of absorbent which could meet all the above-mentioned requirements. The composite of different absorbents is considered the best way to develop good microwave absorption materials. The electromagnetic parameters of Composite Materials can be got a good match by blending or mixing the pure ferrites with other non-magnetic oxides. The practice has been found to change the absorption characteristics of the pure ferrites such as broadening of the frequency for maximal absorption.As far as thickness and working frequency bandwidth are concerned, spinel ferrites and hexaferrites have obvious advantages, its performance parameters is mainly affected by powder composition, particle morphology , size and status of crystallization. In this Paper,spherical Ni_0.5Zn_0.5Fe₂O₄ and acicular Ni_0.5Zn_0.5Fe₂O₄ ferrite powder were prepared by different method, effect of preparation conditions on morphology and properties of Ni_0.5Zn_0.5Fe₂O₄ was studied. Finally, nanosized Co-Ni /Ni_0.5Zn_0.5Fe₂O₄ composite powder was fabricated by electroless plating;one-dimensional polyaniline /Ni_0.5Zn_0.5Fe₂O₄ composite powder was prepared by interfacial polymerization,ZnO/Ni_0.5Zn_0.5Fe₂O₄ composite materials were prepared by homogeneous precipitation. By X-ray diffraction (XRD) , infrared spectroscopy(IR), transmission electron microscopy (TEM),scanning electron microscopy (SEM), vibrating sample magnetometer (VSM),and net work analyzers are used to characterize product of preparation phase,the size and morphology,magnetic properties and absorbing properties. And optimize the preparation of conditions.The research results show that, controlling the particle morphology of materials and compositing the different absorbents according to the properties complementary way can effectively improve the comprehensive absorbing properties of materials. In this study, the maximum loss value of composite materials, and the absorbent of having single absorption bandwidth enhanced significantly, showed more excellent absorbing properties.The above work has provided valuable experimental data and conclusion for enriching composite absorbing agent experiment, application and mechanism research.