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Structural and Electrical Conductivity Studies in Nickel-Zinc Ferrite

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Author(s): K. Rama Krishna | K. Vijaya Kumar | Dachepalli Ravinder

Journal: Advances in Materials Physics and Chemistry
ISSN 2162-531X

Volume: 02;
Issue: 03;
Start page: 185;
Date: 2012;
Original page

Keywords: Nickel –Zinc Ferrite | Lattice Parameter | X-Ray Density | Bulk Density | Porosity | Electrical Conductivity

ABSTRACT
The magnetic particles of nickel-zinc ferrite with chemical composition Ni1-xZnxFe2O4 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.
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