Hydrothemal synthesis of ferrite/carbon composite absorbent and its electromagnetic performance

Ferrite/carbon composite powder was prepared by hydrothermal reaction of glucose solution and BaZn₂Fe₁₆O₂₇ powder synthesized by the solid-state method. The XRD, SEM were used to analyze the structure and the morphology of the composite powder. The vector network analyzer were used to test the electromagnetic performance of the composite absorbent at different hydrothermal reaction temperatures. The results showed that glucose was carbonized after hydrothermal reaction, and grafted on the surface of flake ferrite. The ferrite/carbon micro-nano composite absorbent was obtained. At the frequency range from 2 to 18 GHz, compared with single ferrite, the magnetic loss of composite materials was slightly increased, but the dielectric loss was obviously increased. When the hydrothermal reaction temperature was 160°C, the dielectric loss reached the maximum, and there were dielectric loss peaks and magnetic loss peaks in many places, it was beneficial to the absorption of electromagnetic wave, moreover, the absorbing band of microwave was broadened, the amount of absorbent was reduced, and the absorption effect was further increased.