Chromium Substituted Cobalt Ferrites by Glycine-Nitrates Process

Abstract

Chromium substituted cobalt ferrites (CoFe2-xCrxO4, 0  x  2) were synthesized through solution combustion method using glycine as fuel, named glycine-nitrates process (GNP). As evidenced by X-ray diffraction data (XRD), single cubic spinel phase was formed for all CoFe2−xCrxO4 (0  x  2) series. The cubic lattice parameter (a) decreases with increasing chromium content. Room temperature 57 Fe Mössbauer spectra revealed the Fe 3+ and Cr 3+ site occupancy, the local hyperfine magnetic fields and the substitution of Fe 3+ by Cr 3+ in the lattice. Scanning electron microscopy (SEM) showed a refinement of particle size with the increase of Cr 3+ content. Magnetic measurements from 5 K to 120 K have shown a dropping in the saturation magnetization as the chromium content increases. This behaviour has been explained in terms of substitution of Fe 3+ by Cr 3+ in the cubic lattice of cobalt ferrite.

Effect of Synthesizing Temperature on the Structure and Magnetic Properties of The Co-Ferrite

“…During synthesis, the fusion process, which takes place at high temperatures, may accelerate the rate of crystal size increase of the final product. D. Gingasu et al observe the same observation [13].…”

Photocatalytic Properties of Co-precipitated Bismuth Cobalt Ferrite

“…The variations in the distribution of cations open up opportunities to modify the physical properties of cobalt ferrite by doping other cations. Several nanoparticle synthesis methods have been developed, including the coprecipitation method, sol-gel method, hydrothermal method, and glycine nitrate process (Amiri & Shokrollahi, 2013;Hajalilou et al, 2016;Gingasu et al, 2015). Among these methods, the coprecipitation method is the most effective and the simplest (Setiadi et al, 2016).…”

Structural, morphological and magnetic investigations on cobalt ferrite nanoparticles obtained through green synthesis routes

“…Several factors such as particle size, shape and porosity that are closely related to the synthesis method, have significant impact on the cobalt ferrite properties [12]. Among the chemical methods, special attention is given to coprecipitation and Pechini methods [13,14], sol-gel process [15,16], hydrothermal/solvothermal technique [1,[17][18][19], precursor method [20], combustion method and microwave-assisted combustion method [21][22][23][24], microemulsion method [7] and polyol process [25]. Das et al [17] reported a significant modification in the size of the particles and magnetic properties when adding the CTAB surfactant in the synthesis of CoFe 2 O 4 nanoparticles through the hydrothermal method.…”