Morphology, structural, optical, magnetic, and photocatalytic properties of Co1−xZnxFe2−yCeyO4 NPs

An effect of trivalent yttrium ion substitution on the structural properties of Co-Zn ferrite has been studied after the fabrication of Co1-xZnxFe2-yYyO4 nanoparticles at a typical concentration (x=0.3, y=0.2). The synthesis of Co1-xZnxFe2-yYyO4 nanoparticles was carried out via sol-gel auto-combustion technique using the citric acid as a fuel with a metal nitrate to citrate ratio of 1:3. X-ray diffraction studies of Co1-xZnxFe2-yYyO4 nanoparticles were carried out to study the structural parameter and phase purity. In this study, the XRD pattern revealed the presence of Bragg's reflections belongs to the cubic spinel structure. The Y3+ ion doping creates additional phases in the Co-Zn ferrite, which plays a crucial role in controlling the physicochemical properties of the typical samples. The crystallite size (t) was estimated using Debye-Scherrer's formula and reported to be decreased as a result of Y3+ ionic exchange as per the expectations. Y3+ ion substituted Co-Zn ferrite (with Y content = 0.02 per formula unit) may be considered for an attenuation application in the particular range. Visible range light was used for the photocatalytic degradation measurements using methylene Blue dye. In particular, an enhanced degradation efficiency of Co1-xZnxFe2-yYyO4 nanoparticles was observed. The UV-vis spectroscopic studies were performed and reported in the wavelength range 220 - 400 nm to check the absorbance of methylene blue dye at different time intervals.

Sol-Gel synthesis, structural characterizations, photo- catalytic degradation for H2 production and UV-Absorption of yttrium-substituted Co-Zn ferrite nanoparticles

In this study, an attempt is made to explain the effect of trivalent cerium ion substitution on the structural properties of Co-Zn ferrite with the synthesis of Co1-xZnxFe2-yCeyO4 nanoparticles at the concentrations (x = 0.3, y = 0.04). The synthesis of nano- crystalline Co1-xZnxFe2-yCeyO4 was carried out via sol-gel auto-combustion technique using citric acid as a fuel with a nitrate-citrate ratio 1:3. X-ray diffraction studies of Co1-xZnxFe2-yCeyO4 nanoparticles were carried out to study the phase purity and Ce3+ ion loading effects on structural parameters. In the present scenario, XRD pattern revealed the presence of Bragg's reflections belongs to the cubic spinel structure. In some samples of Co-Zn ferrite, we report the creation of additional phases in due to the Ce3+ ion loading, which interns took control of the physical and chemical properties of typical samples. A noticeable decrease in value of lattice parameter (a) was reported with the loading of Ce3+ ion in a parent crystal structure suggesting the shrinkage in unit cell. The crystallite size (t) was estimated using Scherrer formula and found to be decreased as a result of Ce3+ ionic exchange. FTIR confirms the formation of spinel phase with two prominent high frequency band v1 and low frequency band v2 attributed to intrinsic vibrations of tetrahedral group (A-site) and octahedral groups [B-sites] of Co1-xZnxFe2-yCeyO4 nanoparticles. Ce3+ ion doped Co-Zn ferrite (with Ce3+ content = 0.04 per formula unit) may be a good candidate for the potential applications in high density recording media and memory devices applications. The photo-catalytic degradation was carried out using visible range light and methylene Blue dye for the efficiency measurements. The UV-Absorption studies were performed and reported in the wavelength range 200-400 nm to investigate the absorbance of methylene blue dye.

Pradip D. Patil

Papers

Sol-Gel synthesis, structural characterizations, photo- catalytic degradation for H2 production and UV-Absorption of yttrium-substituted Co-Zn ferrite nanoparticles

Sol-Gel auto-combustion, structural, photo-catalytic activity and UV-VIS study of Co1-xZnxFe2-yCeyO4 NPs (x = 0.3, y = 0.04)