Structural Aspects of Fe3O4/CoFe2O4 Magnetic Nanoparticles According to X-Ray and Neutron Scattering |
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| Authors: | A. V. Nagornyi M. V. Avdeev O. V. Yelenich S. O. Solopan A. G. Belous A. V. Shulenina V. A. Turchenko D. V. Soloviov L. A. Bulavin V. L. Aksenov |
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| Affiliation: | 1.Joint Institute for Nuclear Research,Dubna,Russia;2.Taras Shevchenko National University of Kyiv,Kyiv,Ukraine;3.Moscow State University,Moscow,Russia;4.Vernadskii Institute of General and Inorganic Chemistry,Ukrainian National Academy of Sciences,Kyiv,Ukraine;5.Institute for Safety Problems of Nuclear Power Plants,Ukrainian National Academy of Sciences,Kyiv,Ukraine;6.Moscow Institute of Physics and Technology,Dolgoprudnyi, Moscow oblast,Russia;7.National Research Center “Kurchatov Institute,”,Moscow,Russia |
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| Abstract: | Structural aspects of powders containing magnetic nanoparticles Fe3O4/CoFe2O4 with the anticipated “core-shell” structure are considered by means of comparative analysis with individual particles of Fe3O4, CoFe2O4 in accordance of data obtained from X-ray powder diffraction and small-angle scattering of X-ray (synchrotron) radiation and neutrons. It is shown that magnetic particles in the powders under study have a strong polydispersity and form complex aggregates. Characteristic sizes of the crystallites, as well as a ratio of magnetite to cobalt-ferrite in the composition of the Fe3O4/CoFe2O4 particles were evaluated from the analysis of the diffraction peaks. Аnalyzing the data on small-angle scattering, the dimensional characteristics of particles and aggregates, as well as the volume fraction of the last ones in the powders, have been obtained. Fractal dimensions of aggregates are determined. A significant difference is observed in the scattering on Fe3O4/CoFe2O4 particles and the total scattering consisting of partial contributions to scattering on individual magnetite (Fe3O4) and cobalt-ferrite (CoFe2O4) powders, which does not exclude the formation of the “core-shell” structure. |
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