Concentration of immobilized ε iron oxide nanoparticles as a basis for obtaining highly filled magnetically hard materials
Balaev D. A.1, Kirillov V. L.2, Dubrovskiy A. A.1, Semenov S. V.1, Knyazev Yu. V.1, Volochaev M. N.1, Martyanov O. N. 2
1Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
2Boreskov Institute of Catalysis, Siberian Branch of RAS, Novosibirsk, Russia
Email: dabalaev@iph.krasn.ru
The results of the study of the magnetic properties of the powder system of iron oxide nanoparticles ε-Fe2O3 (average size of 10 nm) are reported. The nanoparticles were obtained from a previously prepared composite material ε-Fe2O3/SiO2 xerogel containing 20 wt.% ε-Fe2O3 by dissolving the SiO2 matrix. The results of X-ray diffraction and Mossbauer spectroscopy confirmed the structure of ε-Fe2O3. From the analysis of magnetic measurements and the results of Mossbauer spectroscopy, it is possible to state the presence of a magnetic transition known for ε-Fe2O3 in the range of 75-150 K. This indicates the preservation of the magnetic characteristics of the particles after the matrix removal procedure and opens the possibility of obtaining a highly filled magnetically hard material based on epsilon-iron oxide. Keywords: nanoparticles, ε-Fe2O3, Mossbauer spectroscopy, magnetization, magnetic transition.
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