Abstract
In this work we report the preparation of magnetic hematite hollow sub-micron spheres (α-Fe2O3) by colloidal suspensions of ferric nitrate nine-hydrate (Fe(NO3)3·9H2O) particles in citric acid solution by following the sol–gel method. After the gel formation, the samples were annealed at different temperatures in an oxidizing atmosphere. Annealing at 180°C resulted in an amorphous phase, without iron oxide formation. Annealing at 250°C resulted in coexisting phases of hematite, maghemite and magnetite, whereas at 400°C, only hematite and maghemite were found. Pure hematite hollow sub-micron spheres with porous shells were formed after annealing at 600°C. The characterization was performed by X-ray diffraction (XRD), Mössbauer spectroscopy (MS) and scanning electron microscopy (SEM).
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León, L., Bustamante, A., Osorio, A. et al. Synthesis and characterization of hollow α-Fe2O3 sub-micron spheres prepared by sol–gel. Hyperfine Interact 202, 131–137 (2011). https://doi.org/10.1007/s10751-011-0353-1
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DOI: https://doi.org/10.1007/s10751-011-0353-1