Mössbauer spectroscopic investigations of nanophase iron oxides synthesized by thermal plasma route

Nagar Harshada Nagar, Naveen V. Kulkarni, Soumen Karmakar, B. Sahoo, I. Banerjee, P. S. Chaudhari, R. Pasricha, A. K. Das, S. V. Bhoraskar, S. K. Date, W. Keune

Research output: Contribution to journalArticlepeer-review

Abstract

Magnetic nanoparticles of iron oxide were synthesized by transferred arc plasma induced gas phase condensation method. Structural, morphological and magnetic studies of the as synthesized powder were carried out using X-ray diffraction, transmission electron microscopy and Mössbauer spectroscopy. These studies have revealed the simultaneous nucleation and condensation of different magnetic phases with a broad size distribution of the nanoparticles which is peaked at 30-50 nm and ranges from 10 nm to 80 nm. 57Fe Mössbauer spectra recorded at various temperatures (5 K-300 K) in presence of external magnetic field (at 5 K) have suggested the presence of different phases of iron oxide with sizable amounts of γ-Fe2O3 and α-Fe2O3 in addition to Fe3O4. The relative concentrations of these phases have been obtained by a self consistent spectral area analysis and were found to be 44:22:34 (%).

Original languageEnglish (US)
Pages (from-to)1215-1220
Number of pages6
JournalMaterials Characterization
Volume59
Issue number9
DOIs
StatePublished - Sep 2008

Keywords

  • Iron oxides
  • Mössbauer spectroscopy
  • Phase analysis
  • Plasma synthesis

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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