Investigation of the precursors of γ-Fe 2 O 3 in Fe 2 O 3 /SiO 2 nanocomposites obtained through sol-gel

C. Cannas, G. Concas, Andrea Falqui, A. Musinu*, G. Spano, G. Piccaluga

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

The structure and the magnetic properties of a series of Fe 2 O 3 -SiO 2 nanocomposites (16.9 and 28.5 wt% of Fe 2 O 3 /(Fe 2 O 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 2 O 3 that form in Fe 2 O 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.

Original languageEnglish (US)
Pages (from-to)64-73
Number of pages10
JournalJournal of Non-Crystalline Solids
Volume286
Issue number1-2
DOIs
StatePublished - Jun 1 2001

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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