Effect of Sm3+ substitution on structural and magnetic investigation of nano sized Mn-​Sm-​Zn ferrites

Nano size Mn0.4Zn0.6SmxFe2-​xO4 (x = 0.00, 0.01, 0.02, 0.03, 0.04, and 0.05) ferrites were prepd. by soln. combustion method. The structural and magnetic properties of samples were characterised by X-​ray diffractometer, Fourier transform IR spectrometer, transmission electron micrographs and magnetic properties at room temp. The X-​ray diffraction patterns and two prominent absorption bands in the frequency range 375-​589 cm-​1 confirmed the single phase with spinel cubic structure. The av. nano crystallite sizes were in best agreements with transmission electron microscope images. Magnetic studies revealed the narrow hysteresis loops of ferrimagnetic nature at room temp. The values of satn. magnetization (Ms)​, remanence magnetization (Mr)​, coercivity (Hc)​, remanence ratio (Mr/Ms)​, magneton no., anisotropy const. and Yaffet-​Kittle angle decreased with the increase in Sm3+ ion concn. was attributed to relative no. of ferric ions on the tetrahedral sites diminished and reduced the Sm-​Fe interaction

Effect of Sc3+ on Structural and Magnetic Properties of Mn-Zn Nano Ferrites

In the present investigation, for the first time, we report on the effect of Sc3+ on the structural and magnetic properties of Mn0.5 Zn 0.5ScyFe2-yO4 (y = 0.01, 0.03 and 0.05) nanoferrites synthesized by solution combustion method using the mixture of fuels. As synthesized powders were characterized for the detailed structural analysis by X-ray diffractometer (XRD), Fourier transmission infrared spectroscopy (FTIR) and room temperature magnetic properties by using vibrating sample magnetometer (VSM). The results of XRD and FTIR confirm that the formation of nano crystalline, single-phased Mn-Zn ferrite with cubic spinel structure belongs to Fd-3m space group. The room temperature magnetic studies shows that, the saturation magnetization (MS), remanence magnetization (MR) and magnetic moment (ηB), magnetic particle size (Dm) have found to increase with Sc3+ ion concentration up to x = 0.3 and then decrease. The values of αY-K and the magnetic particle size (Dm) are found to be in the range of 68-75° and 10-19 nm respectively, with Sc3+ concentration

Dielectric and magnetic properties of high porous Gd+3 substituted nickel zinc ferrite nanoparticles

We report on the synthesis and characterization of Gd+3 substituted Ni-Zn nano ferrites (Ni0.6Zn0.4 GdyFe2-yO4; y = 0, 0.1, 0.15, and 0.2) via low-temperature citrate gel auto-combustion method. The structural studies carried out by PXRD revealed a decrease in the lattice constant and crystallite sizes upon Gd+3 substitution with low concentration but increases with further increase in the concentration. We found the porosity of the samples decreases linearly as a function of Gd+3 concentrations. Well defined spherical grains with a higher porosity of the samples are confirmed by FESEM analysis. With an increase in the Gd+3 concentrations, the dielectric constant increased up to five folds in the magnitude. The contribution of grain boundary and other factors on the electrical properties was revealed by impedance spectroscopy. The reduced remanence ratios showed in the magnetic hysteresis imply the charge in change in the magnetic properties upon the substitution of Gd+3 in the prepared ferrite