Features of the structure, microstructure, radio-emitting and radio-absorbing properties of mechanically and non-mechanically activated BiFeO3 ceramics
Krasniakova I. O.1, Sidorenko E. N.2, Galatova A. O.3, Rudsky D. I.3, Glazunova E. V.3, Kuprina Yu. A.3, Nazarenko A. V.4, Kofanova N. B.2, Rudskaya A. G.2
1The Smart Materials Research Institute at the Southern Federal University, Rostov-on-Don, Russia
2Southern Federal University, Rostov-on-Don, Russia
3Scientific Research Institute of Physics, Southern Federal University, Rostov-on-Don, Russia
4Federal Research Center Southern Scientific Center of the Russian Academy of Sciences, Rostov-on-Don, Russia
Email: agrudskaya@sfedu.ru

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By the method of the two-stage solid-phase synthesis from a stoichiometric mixture of the bismuth and iron oxides, mechanically and non-mechanically activated samples of bismuth ferrite ceramics were prepared. The phase composition of the ceramic samples is predominantly BiFeO3, while Bi25FeO40 and Bi2Fe4O9 are recorded in minor amounts, the proportion of the latter decreases due to mechanical activation. Mechanical processing of the samples expands the range of linear sizes of microparticles. It has been established that mechanically activated bismuth ferrite ceramics absorb electromagnetic microwave energy up to -16 dB, while the samples of the original material absorb up to -25 dB. Both ceramic samples are capable of emitting a weak electromagnetic field, which decreases with increasing height above the sample. Keywords: bismuth ferrite BiFeO3, solid-phase synthesis, mechanical activation, structure, microstructure, radio absorption and radio emission.
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