Abstract
Fe3O4 nanoparticles were synthesized, using a simple co-precipitation method and then calcined at various temperatures in the range of 50–850 °C for 1 h in air. After calcination, the nanoparticles were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy and vibrating sample magnetometer. The X-ray diffraction results indicated that Fe3O4 nanoparticles were converted to γ-Fe2O3 by calcining at 250 °C for 1 h and then to α-Fe2O3 on calcining in the range of 550–650 °C. The average crystallite size of the nanoparticles was calculated by using the Scherrer and Williamson-Hall methods. The average crystallite size of the iron oxides NPs increased from 7.2 to 35.8 nm by increasing calcination temperature from 50 to 850 °C. A small strain existed, which were affected on the physical and structural properties of Fe3O4. The vibrating sample magnetometer results indicated that, the as-synthesized nanoparticles converted from superparamagnetic to ferromagnetic phase with calcinations up to 650 °C, due to increasing size of nanoparticles from a single domain to multidomain as indicated in the X-ray diffraction results.
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We gratefully acknowledge university of Guilan for the financial support.
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Jafari, A., Farjami Shayesteh, S., Salouti, M. et al. Dependence of structural phase transition and lattice strain of Fe3O4 nanoparticles on calcination temperature. Indian J Phys 89, 551–560 (2015). https://doi.org/10.1007/s12648-014-0627-y
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DOI: https://doi.org/10.1007/s12648-014-0627-y