Journal
JOURNAL OF CLUSTER SCIENCE
Volume 21, Issue 1, Pages 11-20Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10876-009-0278-x
Keywords
Iron oxide; Nanoparticles; Hematite; Maghemite; Solid state
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Funding
- Abhar Payame Noor University Research Council
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The iron oxide nanoparticles were synthesized by solid state chemical reaction method. The synthesized powders were characterized by XRD, SEM, EDAX and TG-DTA techniques. An average grain size of 10-20 nm for Maghemite and 80-85 nm for Hematite was calculated using XRD line broadening and SEM. The effect of different parameters such as annealing temperature, milling time, Fe(+3):Fe(+2) concentration ratio have been investigated on the particle size and phase formation. Heat treatment of the produced powders in which Fe(+3):Fe(+2) ratio equal to 2:1, resulted in tetragonal (Maghemite) and rombohedral (Hematite) structures at 300 and 600 A degrees C, respectively. It was found that by changing Fe(+3):Fe(+2) ratios from 2:1 to 1:2, hematite phase and from 2:1 to 1:1, Maghemite phase were formed at 300 A degrees C. In addition with increasing milling time, the iron oxide particle size decreases, but there was no changing in the kind of phase.
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