CoFe2O4 nanocrystalline powders prepared by citrate-gel methods: Synthesis, structure and magnetic properties

C. Cannas, Andrea Falqui, A. Musinu, D. Peddis*, Giorgio Piccaluga

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

88 Scopus citations

Abstract

Nanocrystalline CoFe2O4 powders were prepared by decomposition of metal ion citrate precursors. Four samples were synthesized from precursor solutions having different pH values in the range <1-7.0. The powders were characterized by X-ray Diffraction, Thermogravimetry, Differential Thermal Analysis, N2 physisorption and Transmission Electron Microscopy. Magnetic properties were explored by a SQUID magnetometer. Three out of the four samples, coming from solutions of pH 2, 4 and 7, were produced by an autocombustion reaction and are very similar as regards average size of the nanoparticles (about 20 nm), their morphology and the magnetic properties, while the fourth sample was produced by a slower thermal decomposition and is composed of smaller nanoparticles (about 10 nm).

Original languageEnglish (US)
Pages (from-to)255-267
Number of pages13
JournalJournal of Nanoparticle Research
Volume8
Issue number2
DOIs
StatePublished - Apr 1 2006

Keywords

  • Autocombustion
  • Ferrite
  • Nanoparticles
  • Sol-gel
  • Superparamagnetism
  • pH value

ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

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