This article is cited in 11 papers

Low dimensional systems

The synthesis of clusters of iron oxides in mesopores of monodisperse spherical silica particles

E. Yu. Stovpyaga^a, D. A. Eurov^a, D. A. Kurdyukov^ab, A. N. Smirnov^a, M. A. Yagovkina^a, V. Yu. Grigoryev^c, V. V. Romanov^c, D. R. Yakovlev^d, V. G. Golubev<sup>a

a</sup> Ioffe Institute, St. Petersburg
^b St. Petersburg National Research University of Information Technologies, Mechanics and Optics
^c Peter the Great St. Petersburg Polytechnic University
^d Experimentelle Physik II, Universität Dortmund, Dortmund, Germany

Abstract: The method of obtaining nanoclusters $\alpha$-Fe$_{2}$O$_{3}$ in the pores of monodisperse spherical particles of mesoporous silica ($m$SiO$_2$) by a single impregnation of the pores with a melt of crystalline hydrate of ferric nitrate and its subsequent thermal destruction has been proposed. Fe$_{3}$O$_{4}$ nanoclusters are synthesized from $\alpha$-Fe$_{2}$O$_{3}$ in the pores by reducing in thermodynamically equilibrium conditions. Then particles containing Fe$_{3}$O$_{4}$ were annealed in oxygen for the conversion of Fe$_{3}$O$_{4}$ back to $\alpha$-Fe$_{2}$O$_{3}$. In the result, the particles with the structure of the core-shell $m$SiO$_2$/ Fe$_{3}$O$_{4}$@$m$SiO$_2$/$\alpha$-Fe$_{2}$O$_{3}$ are obtained. The composition and structure of synthesized materials as well as the field dependence of the magnetic moment on the magnetic field strength have been investigated.

Received: 12.12.2016

DOI: 10.21883/FTT.2017.08.44764.439

 English version: Physics of the Solid State, 2017, 59:8, 1623–1628

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