Magneto-structural behaviour of Gd doped nanocrystalline Co-Zn ferrites governed by domain wall movement and spin rotations

Doping effect of rare-earth (lanthanum, neodymium and gadolinium) ions on structural, optical, dielectric and magnetic properties of copper nanoferrites

Spinel ferrites with a compatible electronic band structure are always excellent candidates for photo-catalytic environmental detoxification employing visible light and solar energy. However, the potential is not harnessed to its fullest owing to unnerving charge carrier recombination. In this work, we report the synthesis of Ni1-xZnxFe2O4 (x = 0, 0.1, 0.3, & 0.5) mixed spinel ferrites via combustion route. As prepared samples were characterized for phase identification using X-ray diffraction (XRD) and Reitveld refined pattern confirms the formation of single phased cubic structure with a nano-metric crystallite size. The homogeneous distribution of grains and particles is evidenced by shape and size morphological studies. Raman spectroscopy reveals the presence of motion of oxygen in tetrahedral and octahedral voids. The dc electrical resistivity measured using the two probe method is found to be in the range of 107 to 108 Ω-cm. The optical band gap measured for all photo-catalysts resides at 2.11–2.53 eV. The ferrite photocatalyst exhibits high visible absorption, superior charge transfer capacity, and highly suppressed recombination as suggested by electrochemical impedance spectroscopy and photoluminescence results. The change in band structure with variable Zn content was monitored by shifting of conduction and valence bands. The photo-catalyst Ni0.7Zn0.3Fe2O4 (N2) exhibited 96.8% levofloxacin (LEV) degradation in 90 min of visible light exposure. The effect of parameters such as pH, catalyst dosage, electrolytes and water matrix was analysed in detail. The photo-catalytic degradation rate was enhanced in the presence of persulfate and H2O2. Furthermore, the high magnetic character of the catalysts aids in their retrieval post utilization in catalysis. In terms of band structure analysis, role of dopants, metal redox, and scavenging studies, a suitable photo-catalytic process was proposed. Degradation intermediates discovered by liquid chromatography–mass spectrometry analysis were also recommended as a pathway of degradation. These findings open up exciting possibilities for developing novel solar active photo-catalytic systems based on spinel ferrites for efficient environmental cleanup.

Nanostructured magnetic inverse spinel Ni–Zn ferrite as environmental friendly visible light driven photo-degradation of levofloxacin

Cobalt doping on nickel ferrite nanocrystals enhances the micro-structural and magnetic properties: Shows a correlation between them

Structural, optical, dielectric and magnetic studies of gadolinium-added Mn-Cu nanoferrites

Structural, magnetic and Mössbauer studies of Nd-doped Mg-Mn ferrite nanoparticles

In this work, a series of silver-doped Mg–Mn ferrite nanoparticles, Mg0.9Mn0.1AgxFe2−xO4 (x = 0.0, 0.1, 0.2), has been synthesized by solution combustion method and effects of Ag+ ions on the structural, electrical, magnetic as well as optical properties have been investigated. The phase recognition has been confirmed by utilizing X-ray diffraction (XRD) study. The particle size and strain has been estimated using the Williamsons–Hall plots, while Nelson–Riley plots have been utilized to predict the lattice parameter. An increase in the particle size (17.5–21.8 nm) and lattice parameter (8.37–8.39 A) has been viewed with the adding up of Ag+ ions. Incorporation of Ag+ ion has decreased the resistivity and has produced a normal dispersion curve in the dielectric properties. The M–H study has confirmed an increase in the saturation magnetization (16.9–22.7 emu/g), which has reflected the strengthening of magnetic exchange interactions with the addition of silver content in the Mg–Mn ferrite nanoparticles matrix. The bandgap estimated from the Tauc plots has been viewed to decrease (6.08–4.85 eV) by the rise in silver ions content. Raman spectroscopy study has predicted a slight shift in the Raman modes towards the lower frequency. The electric and dielectric properties have been explained in the light of Verwey’s hopping mechanism and Maxwell–Wagner model, respectively. The obtained magnetic parameters have suggested that present nanoferrites are quite suitable for electromagnet application.

Investigation of electrical, magnetic, and optical properties of silver-substituted magnesium–manganese ferrite nanoparticles

Cation distribution and structural study of copper doped magnesium-manganese nanoferrites

In the present work, we have synthesized a series of Gd3+ substituted BiFeO3 multiferroics, GdxBi1-xFeO3 (x = 0.0, 0.01, 0.02) by solution combustion technique and then explored the samples for magnetic and Mossbauer spectroscopy measurements. The particle size and lattice parameter have been observed to increase (22.2-27.3 nm) and (3.89-3.98 A) with the increase in Gd3+ doping respectively. Magnetic study has revealed an increase in the saturation magnetization (2.69-5.19 emu/g) with the incorporation of Gd3+ ions while coercivity has been found to be decreasing (231.27-104.54 Oe) with the addition of Gd3+ ions in BiFeO3 matrix. Mossbauer spectroscopy has suggested an increase in the ferromagnetic ordering with the increasing substitution of Gd3+ ions.In the present work, we have synthesized a series of Gd3+ substituted BiFeO3 multiferroics, GdxBi1-xFeO3 (x = 0.0, 0.01, 0.02) by solution combustion technique and then explored the samples for magnetic and Mossbauer spectroscopy measurements. The particle size and lattice parameter have been observed to increase (22.2-27.3 nm) and (3.89-3.98 A) with the increase in Gd3+ doping respectively. Magnetic study has revealed an increase in the saturation magnetization (2.69-5.19 emu/g) with the incorporation of Gd3+ ions while coercivity has been found to be decreasing (231.27-104.54 Oe) with the addition of Gd3+ ions in BiFeO3 matrix. Mossbauer spectroscopy has suggested an increase in the ferromagnetic ordering with the increasing substitution of Gd3+ ions.

Somnath

Papers

Structural, magnetic and Mössbauer studies of Nd-doped Mg-Mn ferrite nanoparticles

Investigation of electrical, magnetic, and optical properties of silver-substituted magnesium–manganese ferrite nanoparticles

Cation distribution and structural study of copper doped magnesium-manganese nanoferrites

Magnetic study of GdxBi1-xFeO3 multiferroics synthesized by solution combustion technique