Structural and electrodynamic characteristics of the spinel-based composite system

Two- and tree-component spinel-polymer composites were produced by thermal pressing. The initial components were chosen as CoFe2O4 and Ni0.4Cu0.2Zn0.4Fe2O4 spinels that were produced using the sol-gel method. The ratio between spinel phases varied from 1:3 to 3:1. As a polymer, fluorinated ethylene propylene was used. The concentration of the spinels in the polymer matrix was fixed at 20 mass.%. Using XRD, SEM, and high-frequency spectroscopy, the correlation between the composition, structure, and electrodynamic characteristics of composites was established. It was found that the parameters of the unit cell of ferrite fillers do not change when filling the polymer. The RL values for the initial CoFe2O4/FEP and Ni0.4Cu0.2Zn0.4Fe2O4/FEP were in the range of -14.5 ... -24.2 dB and -10.4 ... -14.1 dB, respectively, which is lower than for ferrites without a polymer matrix. The maximum values of RL (as a module) were marked for CoFe2O4/FEP. Obtained values of the reflection loss coefficient in the range of 5-10 GHz open broad perspectives for the development of materials for electromagnetic absorption and 5G technology.