Structural, Magnetic, and Dielectric Properties of PEG Assisted Synthesis of Mn0.5Ni0.5Fe2O4 Nanoferrites

The Mn_0.5Ni_0.5Fe₂O₄ nanoferrites with different morphology were prepared using the PEG assisted coprecipitation method. The two different iron salts were used for preparing the Mn–Ni ferrites with different morphologies by the coprecipitation air oxygenation method. Spherical and acicular nanoparticles were obtained by the calcination of the precursor. The phase, morphology, and crystallite size of the samples were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Magnetic properties were measured by the vibrating sample magnetometer (VSM). The saturation magnetization (M _s ), coercivity (H _c ) and Bohr magneton (n _B ) were found to be increased with an increase in effective anisotropy. The dielectric properties were found to decrease with the increased heterogeneity in the samples. The dielectric constant (ε′) and dielectric loss (tanδ) measured from 20 Hz to 1 GHz and variation in magnitudes show dependence on morphology of the prepared samples. Impedance spectroscopic measurements revealed that the electrical conduction in ferrite ceramics is due to resistance of grains interior.