A study of the microwave absorbing properties of coatings based on bulk samples of W-type hexaferites is presented. The link between dielectric and magnetic permeability makes it possible to control their magnetic properties by doping the original composition. Hexaferrites are the most stable system, showing a good rate of absorption and reflection of electromagnetic radiation in the microwave range. The substantiation of the choice of material for the manufacture an absorber of electromagnetic radiation and a brief description of the technology of obtaining a composite absorber based on W-type hexaferrite are given. The results of studying the characteristics of reflection and absorption of electromagnetic radiation based on W-type hexaferrite powder in the frequency range 1 MHz –40 GHz are presented. Recommendations are given on the use of the proposed composite material as an absorber of electromagnetic radiation. It is shown that the use of a composite material for shielding and absorbing EMP has great prospects, while the shielding efficiency depends, first of all, on the type of ceramic material.
The results of the influence of Ti4+ + Сo2+ ions on the magnetic properties of ferrites are presented. It is shown that the increase in the content of Со2+ + ions Ti4+ in the structure of spinel ferrites can be controlled to change as the values of magnetic permeability and temperature of the phase transition to the paramagnetic state. Magnetic and dielectric properties of ferrites are closely related to their chemical transformations during synthesis and temperature treatment. Temperature treatment, provides homogenization and formation of ceramic structure. The paper considers ferrite systems as phases of variable composition formed in the process of temperature treatment. Specific examples are given of modern ideas about the physic-chemical nature of the processes of synthesis of ceramics. The obtained samples are characterized by high density, micron size of crystallites, uniform distribution of alloying impurities, chemical homogeneity.
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