nickel ferrite nanomaterials: synthesis, characterization and properties journal: nanoscience and nanotechnology letters volume-9 no-11 november-2017 page:1688-1695
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In the present study, AB2O4 type nickel ferrite (NiFe2O4 nanoparticles (NPs) were prepared by a co-precipitation method. The crystal structure, phase purity, morphology, optical and kinetic properties of the NiFe2O NPs were investigated by X-ray diffraction (XRD), Rietveld refinement, scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) and UV-Visible spectroscopy. The XRD diffraction pattern revealed the degree of crystallinity and confirming the cubic spinel system with the space group of Fd3m:2, a typical crystal structure of nickel ferrite spinel. The SEM studies exhibited that the synthesized NiFe2O NPs had an average particle size of ∼55 nm. Two stage decomposition pattern was observed for both as-synthesized and calcined NiFe2O NPs. The TGA was further used to analyze the Coats-Redfern and Friedman methods in order to estimate the decomposition activation energy (E α ) which revealed that it obeyed the F1 solid-state nucleation-growth mechanism. Finally, a schematic mechanism for preparation of the AB2O4 type nickel ferrite NPs was proposed.
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