In this work, influence of Cu substitution on structural and magnetic properties of Cobalt-Zinc ferrite nanoparticles synthesized by sol-gel combustion method have been investigated. All the samples exhibit cubic spinel structure and the lattice constant decreases linearly with increasing Cu-content. Average crystallite sizes calculated from Debye-Scherrer formula are in the range of 51-100nm. Cation distribution estimated form X-ray line intensity calculations show that Cu ions simultaneously occupy tetrahedral (A) and octahedral (B) sites with different ratio and Zn and Co ions occupies A and B sites respectively. With increasing Cu content a fraction of Co ions migrate to A site when x>0.2. Saturation magnetization (Ms), Coercivity (Hc) and remanent magnetization (Mr) that varies significantly with Cu-Content. Saturation magnetization decreases from 90.7 emu/g (x=0.0) to 51 emu/g (x=0.4). The proposed cation distribution supports the variation in saturation magnetization and Coercivity with increasing Cu content.

Polycrystalline NiCuZn ferrites prepared by solid state reaction method with various concentrations of copper generalized as Ni 0.7-x Cu x Zn 0.3 Fe 2 O 4 with the x varying from 0 to 0.50 in steps of 0.05 variations. In this paper we present the structural, density and porosity. The powders of the samples were used to characterize the x-ray diffraction. The XRD patterns of the samples provide the evidence of the single cubic crystal symmetry phase. The microstructure of the NiCuZn ferrite average grain size is recorded by SEM. The NiCuZn ferrite system having low cost and low firing metals for preparing the multi layer ferrite chip inductors and higher densification than the Mn-Zn ferrite.

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