Abstract
•Ni0.5Sn0.5CoxMnxFe2−2xO4 (x=0.0–0.8) ferrites were prepared by micro-emulsion method.•Lattice constant and crystallite size were increased by increasing the dopant contents.•Ms and Hc were found to be increased with Co-Mn substitution.•The dc resistivity was observed to decrease with increase in x.•Prepared ferrites wit low losses can be used for transformer cores and power applications.
Ni0.5Sn0.5CoxMnxFe2−2xO4 ferrites with x=0.0–0.8 have been prepared by the micro-emulsion method, using CTAB as a surfactant material. X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR) and vibrational sample magnetometer (VSM) were used to investigate the effects of Co and Mn substitutions on cationic distribution, crystallite size, lattice constant, spectral, magnetic and dielectric properties. Lattice constant and crystallite size were found to increase from 7.4 to 9.25Å and from 11.8 to 19.7nm respectively with increasing substitution of Co and Mn ions. Saturation magnetization (MS) gradually increased from 20.5 to 47.6emu/g with increase in the value of x. However, Coercivity increased from 152.7 to 462.4Oe up to x=0.4 and then it decreased thereafter. The dielectric constant, complex dielectric constant and tan loss (tanδ) were observed to decrease with increase in frequency, depicting the semiconductor behavior of the ferrites. Dc resistivity was observed to decrease considerably upon addition of Co and Mn content. The outcome for the tunable magnetic properties and achieved modification of the synthesized nanocrystallites may be chosen for tremendous applications; such as miniaturized memory devices that are based on the energy storage principles and capacitive components.