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Structure and Magnetic Properties of Nanopowders of Iron Oxides and Hybrid Nanopowders of the Core–Shell Type Based on Them

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Bulletin of the Russian Academy of Sciences: Physics Aims and scope

Abstract

The results are presented from complex phase structural and magnetic studies for uncoated and hybrid nanopowders based on iron oxide of the core–shell type (Fe3−xO4@SiO2). Their phase and structural characteristics are determined along with their and morphologies. It is shown that the nanopowders are nonstoichiometric magnetite Fe3+[Fe 2+1-3 x Fe 3+1+2 x Vx]О4 in which there are volume and surface regions that differ by the electronic state of their iron ions. The results from magnetic measurements reveal a relationship between the dispersity and magnetic properties of nanopowders. The change in the thickness of a defect surface layer and its specific magnetization is analyzed quantitatively as a function of the mean size of magnetite nanoparticles and the presence of a coating. The resulting dependences are constructed and analyzed.

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Authors and Affiliations

  1. National University of Science and Technology MISiS, Moscow, 119991, Russia

    I. S. Grebennikov & A. G. Savchenko

  2. Mendeleev University of Chemical Technology of Russia, Moscow, 125047, Russia

    M. P. Zaytseva, A. G. Muradova & E. V. Yurtov

Authors
  1. I. S. Grebennikov
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  2. A. G. Savchenko
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  3. M. P. Zaytseva
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  4. A. G. Muradova
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  5. E. V. Yurtov
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Corresponding author

Correspondence to I. S. Grebennikov.

Additional information

Original Russian Text © I.S. Grebennikov, A.G. Savchenko, M.P. Zaytseva, A.G. Muradova, E.V. Yurtov, 2018, published in Izvestiya Rossiiskoi Akademii Nauk, Seriya Fizicheskaya, 2018, Vol. 82, No. 9, pp. 1343–1354.

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Grebennikov, I.S., Savchenko, A.G., Zaytseva, M.P. et al. Structure and Magnetic Properties of Nanopowders of Iron Oxides and Hybrid Nanopowders of the Core–Shell Type Based on Them. Bull. Russ. Acad. Sci. Phys. 82, 1222–1231 (2018). https://doi.org/10.3103/S1062873818090125

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