This article is cited in 23 papers

Low dimensional systems

Structure of magnetic nanoclusters in ferriferous alkali borosilicate glasses

T. V. Antropova^a, I. N. Anfimova^a, I. V. Golosovskii^b, Yu. A. Kibalin^b, A. A. Naberezhnov^cd, N. I. Porechnaya^d, O. A. Pshenko^a, A. V. Filimonov<sup>d

a</sup> I. V. Grebenshchikov Institute of Silicate Chemistry of the Russian Academy of Sciences, St. Petersburg
^b The Petersburg Nuclear Physics Institute, The National Research Center "Kurchatov Institute"
^c Ioffe Institute, St. Petersburg
^d Peter the Great St. Petersburg Polytechnic University

Abstract: The crystal structure of two-phase and porous alkali borosilicate glasses with embedded magnetic atoms has been investigated using X-ray powder diffraction. It has been shown that, during the preparation of two-phase (nonporous) glasses, the $\alpha$-Fe$_2$O$_3$ phase undergoes a transition to magnetite (Fe$_3$O$_4$) with the formation (at particular concentrations of $\alpha$-Fe$_2$O$_3$ in the initial mixture) and stabilization of the $\beta$-Fe$_2$O$_3$ phase. The characteristic sizes of nanoparticles of iron oxides (Fe$_3$O$_4$ and $\beta$-Fe$_2$O$_3$) in these glasses have been determined. For two types of porous glasses (namely, the macroporous glass Fe20-MAP and the microporous glass Fe20-MIP), the occupancies of the octahedral (Fe$^{2+}$) and tetrahedral (Fe$^{2+}$/Fe$^{3+}$) iron positions in magnetite have been found.

Received: 21.03.2012

 English version: Physics of the Solid State, 2012, 54:10, 2106–2111

Bibliographic databases:

•