Non-stoichiometric CoFe2O4 nanoparticles supported on an amorphous silica matrix

G. Ennas*, M. F. Casula, A. Falqui, D. Gatteschi, G. Marongiu, S. Marras, G. Piccaluga, C. Sangregorio

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Non-Stoichiometric CoFe2O4 nanoparticles dispersed in an silica matrix with a silica content of 87 wt% and Co/Fe molar ratio of 1:1, were prepared by the sol-gel method using an ethanolic solution of tetraethoxysilane and either iron(III) and cobalt(II) nitrates or iron(II) and cobalt(II) acetates. The influence of different metal precursors on the xerogels were examined by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and N2 physisorption measurements at 77 K. Magnetic properties of the samples were investigated by field cooled FC and zero field cooled ZFC measurements. Depending on the metal precursor, different spinel oxides of a few nanometers were observed in the samples treated at 350°C. After heating at 900°C non-stoichiometric CoFe2O4 was formed in both samples, whose average particle size was only slightly larger than in samples treated at 350°C.

Original languageEnglish (US)
Pages (from-to)463-466
Number of pages4
JournalJournal of Sol-Gel Science and Technology
Issue number1-3
StatePublished - Jan 2003
Externally publishedYes


  • Nanocomposites
  • Precursor chemistry
  • Superparamagnetism

ASJC Scopus subject areas

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


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