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

Journal Article · Mon Sep 15 04:00:00 EDT 2008 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2007.10.003· OSTI ID:21140767

Nagar, Harshada; Kulkarni, Naveen V; Karmakar, Soumen ^[1]; Sahoo, B ^[2]; Banerjee, I; Chaudhari, P S ^[1]; Pasricha, R ^[3]; Das, A K ^[4]; Date, S K ^[1]; Keune, W ^[2]

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1. Department of Physics, University of Pune, Pune 411 007 (India)
2. Department of Physics, University of Duisburg-Essen, D-47048 Duisburg (Germany)
3. National Chemical Laboratory, Homi Bhabha Road, Pune 411 008 (India)
4. Bhabha Atomic Research Center, Mumbai 400 085 (India)

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 Moessbauer 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. {sup 57}Fe Moessbauer 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 {gamma}-Fe{sub 2}O{sub 3} and {alpha}-Fe{sub 2}O{sub 3} in addition to Fe{sub 3}O{sub 4}. The relative concentrations of these phases have been obtained by a self consistent spectral area analysis and were found to be 44:22:34 (%)

• OSTI ID: 21140767
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 9 Vol. 59; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
IRON OXIDES
MAGNETIC FIELDS
MOESSBAUER EFFECT
NANOSTRUCTURES
NUCLEATION
PARTICLES
PHASE STUDIES
PLASMA
POWDERS
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION