Ternary Composite Material Mnfe2o4@Sio2@C Preparation and Absorption Properties

Abstract

In this paper, MnFe2O4@SiO2@ZIF-8 precursor was prepared by hydrothermal and Stoeber methods, and the carbon-covered material was obtained by carbonization, which can effectively enhance the interfacial polarization effect of the powder particles as well as the synergistic effect of the material dielectric loss. The presence of SiO2 improves the thermal stability and effectively modulates and optimizes the wave-absorbing properties. At the frequency f=15.62 GHz, the minimum reflection loss (RLmin) of MnFe2O4@SiO2@C reaches -46.96 dB, which corresponds to the thickness of the coating d=1.682 mm, showing excellent wave-absorbing performance. The silica-coated MnFe2O4 matrix not only achieves the enhancement of the wave-absorbing performance of ferrite matrix composites, but also effectively avoids the erosion of the core of the manganese ferrite matrix, and this study provides a new strategy for the construction of multilayer ferrite matrix composites.

Keywords: Absorbing materials, MnFe2O4, Interfacial polarization, ZIF-8