Abstract
Mixtures of iron(III) oxide polymorphs with a high content of ε-Fe2O3 were obtained by the decomposition of iron(III) nitrate in voids of a close packing of silica spheres. It was shown that the phase composition of Fe2O3 nanopowders can be controlled by using silica spheres of various sizes. The critical sizes of Fe2O3 nanoparticles that correspond to the γ-Fe2O3 → ε-Fe2O3 and ε-Fe2O3 → α-Fe2O3 transitions were determined to be 10 ± 2 and 28 ± 3 nm, respectively. The maximum ε-Fe2O3 content is reached at a silica sphere size of 110 nm and is 83%.
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ACKNOWLEDGMENTS
The scanning electron microscopy studies in this work were made using equipment of the Mendeleev Center for Shared Facilities.
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This work was supported by the Russian Foundation for Basic Research (project no. 20-03-00668).
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A. I. Sharapaev conceived and designed the experiments, carried out the heat treatment of the experimental samples, conducted the transmission electron microscopy analysis, analyzed the experimental data, and wrote the article. S. A. Kuznetsova obtained monodisperse silica particles and closely packed matrices. A. N. Norenko obtained monodisperse silica particles and closely packed matrices, and impregnated the matrices. A. G. Muradova arranged the studies by instrumental methods, analyzed the experimental data, and wrote the article. N. P. Simonenko performed the X-ray powder diffraction analysis of the experimental samples. E. V. Yurtov conceived and designed the experiments, and wrote the article. All authors participated in the discussion of the results.
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Translated by V. Glyanchenko
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Sharapaev, A.I., Kuznetsova, S.A., Norenko, A.N. et al. Production of ε-Fe2O3 Nanoparticles in Matrices Constituted by Closely Packed Silica Spheres. Russ. J. Inorg. Chem. 66, 740–746 (2021). https://doi.org/10.1134/S003602362105017X
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DOI: https://doi.org/10.1134/S003602362105017X