Abstract
The structure and the magnetic properties of a series of Fe 2O 3–SiO 2 nanocomposites (16.9 and 28.5 wt% of Fe 2O 3/(Fe 2O 3+SiO 2)), prepared by a sol–gel method and submitted to thermal treatments in a temperature range 300–700°C, were investigated through X-ray diffraction (XRD), transmission electron microscopy (TEM), Mössbauer spectroscopy and magnetometry. Poorly crystallized particles, belonging to the 2-line ferrihydrite phase, were found in all the samples and recognized as precursors of the γ-Fe 2O 3 that form in Fe 2O 3–SiO 2 nanocomposites at T>700°C. The result was achieved through a detailed comparison of structural and magnetic properties of nanocomposites with a bulk iron (III) oxide hydrated reference sample.
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