Features of the magnetic structure and properties of barium hexaferrite nanopowders obtained by hydrothermal synthesis
Mironovich A.Yu.1, Kostishyn V. G.1, Melnikov S. A.1, Kondratiev M. O.1, Savchenko E. S.1, Savchenko A. G.1, Ril A. I.2
1National University of Science and Technology MISiS, Moscow, Russia
2Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
Email: mironovich.ai@misis.ru
This study investigated the influence of hydroxide ion (OH-) concentration on the phase composition of barium hexaferrite (BaFe12O19) powders synthesized by the hydrothermal method. It was established that a significant excess of alkali in the reaction mixture (OH/NO3>16 ratio) is necessary for the formation of a pure hexaferrite phase without impurities. Scanning electron microscopy demonstrated that the resulting powder consists of thin submicron platelets with well-defined facets. However, the internal structure of the particles is imperfect, which is evidenced by the X-ray diffraction patterns, Mossbauer spectra, and magnetic characteristics of the powder (Ms=18 emu/g, Mr=3.7 emu/g, Hc=0.35 kOe). Annealing the particles leads to the elimination of defects and an improvement in the magnetic parameters (Ms=60 emu/g, Mr=24 emu/g, Hc=3.6 kOe). It was demonstrated that uniaxial pressing of the obtained BaFe12O19 powder leads to the formation of a (00l)-type texture. After annealing at 900 oC, the pressed ferrite exhibits anisotropy of its magnetic properties, which is evidenced by a twofold difference in the squareness ratios of the magnetic hysteresis loops measured with the magnetic field applied parallel (0.3) and perpendicular (0.61) to the sample plane. Keywords: Barium hexaferrite, Hydrothermal synthesis, Magnetic properties, Anisotropy, Crystallographic texture.
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