Optimized synthesis of the elusive ∈-Fe<inf>2</inf>O<inf>3</inf> phase via sol-gel chemistry

Mihaela Popovici, Martí Gich, Daniel Nižňanský, Anna Roig, Cecilia Savii, Lluís Casas, Elies Molins, Karel Zaveta, Corina Enache, Jordi Sort, Sophie De Brion, Gerard Chouteau, Josep Nogués

Research output: Contribution to journalArticleResearchpeer-review

124 Citations (Scopus)


∈-Fe2O3 nanoparticles embedded in a SiO 2 matrix have been synthesized by sol-gel chemistry and high temperature heat treatments. Virtually pure ∈-Fe2O3 (in excess of 93%) is obtained, although a two-phase mixture, ∈-Fe 2O3 + α-Fe2O3, is observed for Fe2O3/SiO2 ratios greater than 37 wt %. The ∈-Fe2O3 nanoparticles are stable up to ∼1600 K. Optimized ∈-Fe2O3 nanoparticles are ferrimagnetic, with a Curie temperature TC ≈ 510 K, and remarkably high values of room-temperature coercivity, HC = 20 kOe.
Original languageEnglish
Pages (from-to)5542-5548
JournalChemistry of Materials
Publication statusPublished - 14 Dec 2004


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