Structural and Electrical Conductivity Studies in Nickel-Zinc Ferrite

K. Rama Krishna, K. Vijaya Kumar, Dachepalli Ravinder

Department of Physics, Jawaharlal Nehru Technological University Hyderabad, College of Engineering, Hyderabad, India.
Department of Physics, Malla Reddy College of Engineering & Technology, Secunderabad, India.
Department of Physics, Osmania University, Hyderabad, India.

DOI: 10.4236/ampc.2012.23028                

Abstract

The magnetic particles of nickel-zinc ferrite with chemical composition Ni_1-xZn_xFe₂O₄ were synthesized successfully by citrate precursor auto-combustion method using high purity nitrates and citric acid as chelating agent. The prepared powder of nickel-zinc ferrites was sintered at 1000℃ for 1 hr to obtain good crystalline phase and was used for further study. The X-ray diffraction technique was employed to confirm the single phase formation of nickel ferrite. The X-ray diffraction pattern shows the Bragg’s peak which belongs to cubic spinel structure. The values of lattice constant, X-ray density, bulk density, and porosity were calculated. The temperature dependence of the electrical conductivity plot shows the kink, which can be attributed to ferromagnetic-paramagnetic transition. The activation energy obtained from resistivity plots in paramagnetic region is found to be more than that in ferrimagnetic region. The conduction mechanism in nickel-zinc ferrite particles has been discussed on the basis of hopping of electrons.

Keywords

Nickel –Zinc Ferrite; Lattice Parameter; X-Ray Density; Bulk Density; Porosity; Electrical Conductivity

Conflicts of Interest

The authors declare no conflicts of interest.

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