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Growth, structure and magnetism of ϵ-Fe2O3 in nanoparticle form

AuthorsLópez-Sánchez, J.; Muñoz-Noval, A. ; Serrano, A.; Abuín, M.; de la Figuera, Juan ; Marco, J.F. ; Pérez, L.; Carmona, N. ; Rodríguez de la Fuente, Oscar
Issue Date2016
CitationRSC Advances 6: 46380- 46387 (2016)
AbstractWe present a novel and easy synthetic path to prepare ϵ-FeO (∼90%) with a small portion of α-FeO nanoparticles embedded in an amorphous silica matrix. An exhaustive structural study reveals the higher relative concentration of the ϵ-phase, with an average particle size of 17 nm. Confocal Raman microscopy and X-ray absorption spectroscopy are presented as novel techniques to characterize the ϵ-polymorph. The magnetic properties have been studied in a wide range of temperatures (5-1000 K), detecting blocking effects (∼135 K), collapse effects (50-125 K), Morin (∼268 K) and Néel (∼505 K) transitions.
Identifiersdoi: 10.1039/c6ra01912a
issn: 2046-2069
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