Magnetic and dielectric materials can be blended to enhance absorption properties at\nmicrowave frequencies, although the materials may have relatively weak attenuation capabilities by\nthemselves. The specific goal of this work is to enhance microwave absorption properties of materials\nwith interesting dielectric behavior by blending them with magnetic materials based on transition\nmetals. The synthesized Mn1âË?â??xZnxFe2O4 (x = 0.0 and 1.0) spinel ferrite nanoparticles (MZF NPs)\nwere blended with commercial multi-walled carbon nanotubes (MWCNTs) in various proportions\nwith a binder matrix of paraffin. This simple and efficient process did not cause a significant\nvariation in the energy states of MWCNTs. MZF NPs were synthesized with a citric acid assisted\nsolââ?¬â??gel method. Their electromagnetic characteristics and microwave absorption properties were\ninvestigated. These properties were derived from the microwave scattering parameters measured\nvia the transmission line technique by using a vector network analyzer (VNA) in conjunction with\nan X band waveguide system. The return loss (RL) values of the samples were obtained from the\nelectromagnetic constitutive parameters (permittivity and permeability). The results indicate that the\nminimum RL value and the bandwidth change significantly with the amount of ferrite material in the\nblend. These results encourage further development of MWCNTs blended with ferrite nanoparticles\nfor broadband microwave applications.
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