Crystallization of (Fe,Mn)-based nanoparticles in sodium-silicate glasses |
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| Authors: | Ruzha Harizanova Ivailo Gugov Christian Rüssel Dragomir Tatchev Vikram Singh Raghuwanshi Armin Hoell |
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| Affiliation: | (1) Department of Physics, University of Chemical Technology and Metallurgy, 1756 Sofia, Bulgaria;(2) Otto-Schott-Institut, Jena University, 07743 Jena, Germany;(3) Institute of Physical Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;(4) Institute of Applied Materials, Helmholtz Zentrum Berlin, 14109 Berlin, Germany |
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| Abstract: | In this investigation, glasses from the system Na2O/MnO/SiO2/Fe2O3 are prepared using a conventional glass-melting technique. During annealing the glass, a nanocrystalline (Fe, Mn)-based spinel
phase is precipitated. The phase composition and microstructure of the formed glass–ceramics are studied using X-ray diffraction
and electron microscopy. Anomalous small-angle X-ray scattering experiment is used to gather information on the size, composition
and element distribution for the precipitated (Fe, Mn)-based nanocrystals. The sizes of the formed spinel crystals, as determined
by scanning electron microscopy and anomalous X-ray scattering, are in the range from 12 to 50 nm for annealing temperatures
in the range from 550 to 700 °C. Annealing for a longer period of time at temperatures ≥600 °C results in the formation of
a second crystalline phase, NaFe(SiO3)2 (aegirine). The ASAXS data show the formation of core–shell structure for the (Fe, Mn)-based crystals with core consisting
mostly of iron oxide and a shell, depleted of Fe and Mn. The growth of the spinel crystals is assumed to be kinetically self-constrained. |
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