Abstract
The phase composition and structure of iron oxide nanopowders obtained by different chemical means are explored via X-ray diffraction, transmission electron microscopy, and Mössbauer and X-ray photoelectron spectroscopy. It is shown that nanoparticles with sizes of 10–85 nm are nonstoichiometric magnetite–maggemite compounds. Particles with average sizes of ~10 nm are close in composition and structure to (γ-Fe2O3) maggemite, while those with sizes above 70 nm resemble (Fe3O4) magnetite. Estimates of the magnetite particle size yield a value of 130 nm, which may be considered the conditional boundary from the bulk state to nanoscale effects.
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Original Russian Text © S.V. Salikhov, A.G. Savchenko, I.S. Grebennikov, E.V. Yurtov, 2015, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2015, Vol. 79, No. 9, pp. 1251–1258.
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Salikhov, S.V., Savchenko, A.G., Grebennikov, I.S. et al. Phase composition and structure of iron oxide nanopowders prepared by chemical means. Bull. Russ. Acad. Sci. Phys. 79, 1106–1112 (2015). https://doi.org/10.3103/S1062873815090166
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DOI: https://doi.org/10.3103/S1062873815090166