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Mossbauer studies of hexagonal isotropic polycrystalline ferrites SrFe12O19, received by methods of radiation-thermal sintering
Russian version
Kostishyn V. G.1, Trukhanov A. V.1, Alekseev A. A.2, Shcherbakov S. V.2, Isaev I. M.1, Mironovich A. Yu.1, Mikhailenko M. A.3, Sysoev M. A.1, Skorlupin G. A.1, Tokin G. M.1,2
1National University of Science and Technology MISiS, Moscow, Russia
2JSC "RPC "Istok" named after Shokin", Fryazino, Moscow oblast, Russia
3Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Email: drvgkostishyn@mail.ru
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Hexagonal strontium ferrite (SrFe12O19) is widely used as permanent magnets and in microwave electronics. Its functional characteristics depend on the manufacturing technology. This paper for the first time uses the method of radiation-thermal sintering (RTS) in a beam of fast neutrons on ILU-6 accelerator to produce specimens SrFe12O19. The process temperature varied from 1200 to 1400oC, and sintering time - from 10 to 90 min. The phase composition and parameters of the crystalline lattice of the specimens were researched using methods of Mossbauer spectroscopy and X-ray diffraction. Mossbauer spectra were recorded on MC1104E spectrometer, and X-ray ones - on DRON-8 diffractometer. The density of the specimens is determined by Archimedes on electronic scale UW620H. The results demonstrated that all specimens are single-phase and have space group P63/mmc (N 194), which corresponds to the structure of the hexagonal ferrite. Optimal parameters for synthesis of isotropic hexaferrites make 1250-1300oC and sintering time 30-60 min. Therefore, RTS may serve as an alternative technology to produce polycrystalline isotropic hexagonal ferrite SrFe12O19, demonstrating high energy efficiency and cost-effectiveness compared to the conventional methods Keywords: radiation-thermal sintering, isotropic polycrystalline hexagonal ferrites SrFe12O19, crystalline structure, Mossbauer spectroscopy, elemental cell, ceramic technology, fast neutrons, electron accelerator.
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