Study of Structural, Electrical Transport and Magnetic Properties of Ni-Cu-Zn Ferrites

Abstract

Ni-Cu-Zn ferrites are well known technological magnetic material finding applications in various electrical devices. The present work is focused on the influence on electromagnetic and transport properties of Fe-deficient Ni-Cu-Zn ferrites. These ferrite samples of composition (Ni0.28Cu0.10Zn0.62O)(Fe2O3)x-1 , where x = 0.00, 0.02, 0.04, 0.06 and 0.08 were prepared using the solid state reaction technique. The phase identification was carried out by X-ray diffraction. The X-ray diffraction analysis revealed that the samples crystallize in single phase cubic spinel structure. A slight increase of Curie temperature (Tc) saturation magnetization (Ms) and initial permeability µʹwith increase of Fe-deficient were observed. The permeability spectrum with frequency follows the Snoek's limit. Sample with x = 0.00 sintered at 1100°C possess the maximum value of relative quality factor (RQF). From the B-H loops, the remanance (Br) and coercive force (Hc) were determined. Saturation induction (Bs) and Br/( Bs) are measured from low field B-H loops is found to increase with increasing Fe-deficient up to x = 0.04 thereafter decrease. DC resistivity increases with increasing Fe-deficient up to x = 0.06 and thereafter decrease. The dielectric constant is found to decrease continuously with increasing frequency and remains almost constant at higher frequency range. From hysteresis parameter it was revealed that optimum soft magnetic properties corresponds to the composition with x = 0.06 sintered at I 1000C having highest permeability, maximum induction, minimum coercivity and hysteresis losses.