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[IMPULSE-2024-00151]
Journal Article
Shilova, O. A. ; Kovalenko, A. S. ; Nikolaev, A. M. ; et al
Investigation of the Structure and Properties of Magnetic Nanopowders of Magnetite–Maghemite Solid Solutions by SAPNS
Nanopowders of the magnetite–maghemite series have been synthesized by coprecipitation from aqueous solutions and by the sol–gel method, and a comparative comprehensive study of their structure has been carried out using X-ray diffraction analysis, scanning electron microscopy, low-temperature nitrogen adsorption, and small-angle polarized neutron scattering. It has been established that the resulting iron oxide nanopowders are porous systems that, depending on the synthesis method, have a one-level, two-level (for powders obtained by aqueous synthesis), or three-level (for powders obtained by the sol–gel method) hierarchical structure organization with different scales and different types of aggregation for each of the structural levels, and the characteristic size for the larger level in both cases is >45 nm [...]
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