Electrical and magnetic properties of Cr3+ substituted nanocrystalline nickel ferrite

Abstract

The magnetic and electrical properties of Cr3+ substituted nickel ferrite synthesized by wet chemical route have been studied. Particle size measured from x-ray diffraction and from transmission electron microscopy images confirms the nanosize dimension of prepared particles. Magnetic parameters such as coercivity and saturation magnetization are measured from vibrating sample magnetometer. Magnetization, ac susceptibility, electrical resistivity, and Mössbauer measurements were carried out. Electrical properties such as ac resistivity as a function of frequency and dc resistivity as a function of temperature were studied for various Cr3+ substitutions in nickel ferrite. The dielectric properties such as dielectric constant (ε′) and dielectric loss (ε″) were also studied. The dielectric constant and dielectric loss obtained for the ferrites prepared through wet chemical route posses a value lower than that of the ceramically prepared samples of the same composition. The resistivity obtained is higher than that of ferrite prepared by ceramic method. The dc resistivity increases with Cr3+ content x. The observed variation in resistivity is explained by Verwey hopping mechanism. The activation energy derived form the temperature variation in resistivity was found to increase with increasing concentration of Cr3+ ions.

Role of Cr3+ ions on the microstructure development, and magnetic phase evolution of Ni0.7Zn0.3Fe2O4 ferrite nanoparticles

“…The addition of impurities induces changes in the defect structure and texture of the crystal [15], creating significant modifications in the magnetic and electrical properties of these materials. Several researchers have studied the effects of Cr 3+ substitution in the spinel structure of ferrites [15][16][17]. However, we have not found any reports in the literature on Ni-Zn ferrite powders obtained by combustion reactions.…”

Dielectric Response of Nix Zn1-x Al Fe O4 Nanoferrites

“…Ni-Zn ferrite is a soft magnetic and an important ceramic material which has enormous applications in various fields like electric, magnetic, electronics, microwave devices, catalysts, transformers cores, power conversions, high frequency applications in telecommunications, magnetically control drug delivery system, for multilayer inductor applications, etc [1][2][3][4][5][6][7]. The nanoferrite properties can be easily adjustable, controllable to a great extent by choosing proper preparation methods and suitable doping with divalent, trivalent and rare earth ions [8][9][10]. Different cation substitutions can distribute into the voids of the parent crystal structure and can alter many properties of nanoferrites like DC resistivity, mobility of the charge, desire magnetization, activation energy, Curie temperature and dielectric losses.…”

Synthesis, structural and magnetic characterization of nanocrystalline nickel ferrite—NiFe2O4 obtained by reactive milling

“…The spinel ferrite suitable for many applications, such as: high frequency magnetic materials, recording media, ferrofluid technology, sensor technology, and microwave applications [1][2][3][4][5]. The soft magnetic ferrites are materials which crystallize in cubic spinel structure, spatial group Fd3m.…”