Effects of Ultrasonic Agitation on the Structural and Magnetic Properties of CoFe sub(2)O sub(4) Nanocrystals

Cobalt ferrite nanocrystals (CoFe sub(2)O sub(4)) were synthesized by means of ultrasonic agitation and afterward subjected to different annealing temperatures. The structural and morphological properties of the nanocrystals were investigated by means of X-ray diffraction and scanning electron micro...

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Bibliographic Details
Published in:European journal of inorganic chemistry 2014-11, Vol.2014 (32), p.5603-5608
Main Authors: Almeida Silva, Anielle Christine, Gratens, Xavier, Chitta, Valmir Antonio, Franco, Sinesio Domingues, Souza da Silva, Ricardo, Condeles, Jose Fernando, Dantas, Noelio Oliveira
Format: Article
Language:English
Subjects:
Annealing
Infrared spectroscopy
Magnetic properties
Magnetization
Nanocrystals
Scanning electron microscopy
Ultrasonic agitation
X ray diffraction
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Summary:Cobalt ferrite nanocrystals (CoFe sub(2)O sub(4)) were synthesized by means of ultrasonic agitation and afterward subjected to different annealing temperatures. The structural and morphological properties of the nanocrystals were investigated by means of X-ray diffraction and scanning electron microscopy. The results showed that the samples were composed of CoFe sub(2)O sub(4) monophase nanocrystals. The particle size increased with increasing annealing temperatures. Infrared spectroscopy and magnetization showed that the samples exhibited the usual features of CoFe sub(2)O sub(4) nanocrystals. Superparamagnetism was not observed at room temperature. However, the results indicated that the samples could be considered single-domain particles with blocking temperatures greater than 300 K. Both infrared and magnetic results indicated possible diffusion of cobalt ions from tetrahedral to octahedral sites as a function of the annealing temperature. In this work, we have demonstrated that ultrasonic agitation favors the formation of CoFe sub(2)O sub(4) nanocrystals with uniform size and high magnetization. We confirmed these results by means of X-ray diffraction, scanning electron microscopy, IR spectroscopy, and magnetization measurements.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.201402563