Radiophysicists of Tomsk State University have developed new composite materials that can more effectively absorb side electromagnetic radiation (EMR) within the framework of a grant from the Russian Academy of Sciences. New ferrite–based composites absorb 70% of EMR in the frequency band from 6 to 18 GHz and can be used as a coating for electronic equipment - antennas and antenna fairings, routers, radio stations, electromagnetic fields from which have a negative impact on equipment within its range. The new experimental samples were positively evaluated by potential customers.
Improved composites are intended for use in modern technology, which must meet modern requirements for electromagnetic compatibility.
– The level of side electromagnetic radiation of the device should not exceed the values set by GOST standards, and manufacturers of radio engineering are interested in new effective materials that reduce this radiation, – says Associate professor of the Department of Radioelectronics of the Faculty of Radiophysics of TSU, head of the scientific project Dmitry Wagner. – Our project solves this problem: We have synthesized ferrites that can be used for these purposes, and composites based on them.
Ferrite is a material consisting of iron oxide and oxides of various metals and is a ferrimagnet. With the help of optimally selected synthesis conditions, it is possible to obtain the desired composition of ferrite and use it to produce a composite material for specific technical tasks. TSU radiophysicists have developed a modified ceramic method for the synthesis of ferrites, which made it possible to produce composites based on them with improved characteristics.
– The modification of the method consisted in replacing the pre–annealing stage of reagents with a self-propagating high-temperature synthesis reaction, - says Dmitry Wagner. – During the implementation of the grant, we have worked out this technology and received experimental samples of absorbing composites based on ferrites.
Potential customers – JSC NPF Mikran, JSC NPC Polyus and LLC MK–Polymer - became interested in the development of the scientists of the RFF TSU and offered their options for cooperation.
The results of the study are published in the prestigious scientific journal Journal of Alloys and Compounds (Q1, IF 6.2).
– In the future, we plan to create multicomponent composite materials to expand their fields of application, therefore, we will invite employees of the TSU Faculty of Chemistry who have experience in implementing more complex synthesis methods to the project team, – Dmitry Wagner notes.
The project "Development and research of physical properties of polymer magnetic composite materials based on oxide ferrimagnets to ensure electromagnetic compatibility of technical means" (No. 22-79-00074) is being implemented with the grant support of the Russian Science Foundation. Together with Dmitry Wagner, graduate students of the RFF TSU worked on the project Katerina Kareva and Alexander Suraev.
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