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Revista mexicana de física
Print version ISSN 0035-001X
Abstract
LOPEZ, J. et al. Caracterización de nanopartículas magnéticas de CoFe2O4 y CoZnFe2O4 preparadas por el método de coprecipitación química. Rev. mex. fis. [online]. 2012, vol.58, n.4, pp.293-300. ISSN 0035-001X.
Magnetic cobalt ferrite nanoparticles of CoFe2O4 and CoZnFe2O4 were prepared by co-precipitation technique from aqueous salt solutions of Co (II), ZnSO4 and Fe (III), in an alkaline medium. CoFe2C4 powder samples were structurally characterized by X-ray diffraction, showing the presence of the most intense peak at 2θ= 413928° (Co Kαl) corresponding to the (311) crystallographic orientation of the CoFe2C4 spinel phase. The mean size of the crystallite of CoFe2C4 y CoZnFe2C4 nanoparticles determined from the full-width at half maximum (FWHM) of the strongest reflection of the (311) peak by using the Scherrer approximation was calculated to be 11.4 and 7.0 (± 0.2) nm, respectively. Transmission Electron Microscopy (TEM) studies permitted determining nanoparticle size of CoZnFe2C4. Fourier Transform Infrared Spectroscopy was used to confirm the formation of Fe-O bonds, allowing identifying the presence of ferrite spinel structure. Magnetic properties were investigated with the aid of a vibrating sample magnetometer (VSM) at room temperature Herein, the sample showed superparamagnetic behavior, determined by the hysteresis loop Finally, due to the hysteresis loop of the CoZnFe2C4 is very small, our magnetic nanoparticles can be considered as a soft magnetic material. These magnetic nanoparticles have interesting technological applications in biomedicine given their biocompatibility, in nanotechnology, and in ferrofluid preparation.
Keywords : Coprecipitation; cobalt - zinc ferrites; nanoparticles; spinel structure.