Effect of the annealing temperature on phase composition of iron oxide nanoparticles
International Journal of Development Research
Effect of the annealing temperature on phase composition of iron oxide nanoparticles
Received 18th August, 2019; Received in revised form 03rd September, 2019; Accepted 13th October, 2019; Published online 30th November, 2019
Copyright © 2019, Renilma S. P. Fonseca et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
In this study, we investigated the effect of the annealing temperature on the phases and magnetic properties of iron oxide. Iron oxide nanoparticles were obtained by the thermal decomposition reaction method at different oxidation temperatures (125, 150, 200, and 250 °C). The X-ray powder diffraction data indicate the formation of three different iron oxide phases, being controlled by the annealing temperature: Fe3O4 » (Fe3O4 +α-Fe2O3) » (Fe3O4+ α-Fe2O3+β-Fe2O3). The infrared data confirmed the formation of iron oxide phases in the iron oxide nanoparticles as well as the functionalization of their surfaces by both oleylamine and oleic acid molecules. ZFC-FC analysis suggests the all nanoparticles particles obtained under 250 oC are in the blocked regime. At 300 K, the superparamagnetic contribution for the iron oxide nanoparticles was proportional to the annealing temperature.
