Journal Article

IMPULSE-2024-00151

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Investigation of the Structure and Properties of Magnetic Nanopowders of Magnetite–Maghemite Solid Solutions by SAPNS

Shilova, O. A. ; Kovalenko, A. S. ; Nikolaev, A. M. ; Khamova, T. V. ; Kruchinina, I. Y. ; Kopitsa, G. P.

2024
MAIK Nauka/Interperiodica Publ. Moscow

Please use a persistent id in citations: doi:10.1134/S0036023623603355

Abstract: 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. It has been revealed that the magnetic structure of the obtained iron oxide powders, regardless of the synthesis method, consists of superparamagnetic particles with a characteristic radius of magnetic RM ⁓ 4 nm and magnetic–nuclear cross-correlations RMN ⁓ 3 nm for powders obtained by the sol–gel method, and RM ⁓ 5–11 nm and RMN ⁓ 4–8 nm for powders obtained via aqueous route, depending on the synthesis conditions.Similar content being viewed by

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd) ; Materials Science (2nd)

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Contributing Institute(s):

1. Users (Users)
2. JCNS-FRM-II (JCNS-FRM-II)
3. KWS1 (KWS1)

Experiment(s):

1. KWS-1: Small angle scattering diffractometer (NL3b)

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Database coverage:
Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Springer ; DEAL Springer ; Essential Science Indicators ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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