Synthesis and characterization of hollow α-Fe2O3 sub-micron spheres prepared by sol-gel

Lizbet León, Angel Bustamante, Ana Osorio, G. S. Olarte, Luis Santos De Los Valladares, Crispin H.W. Barnes, Yutaka Majima

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

13 Citas (Scopus)


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).

Idioma originalInglés
Páginas (desde-hasta)131-137
Número de páginas7
PublicaciónHyperfine Interactions
EstadoPublicada - nov. 2011
Publicado de forma externa


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