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Barkule R.S.,Vivekanand Arts and Sardar Dalipsing Commerce and Science College | Raut A.V.,Dr. Babasaheb Ambedkar Marathwada University | Waghule N.N.,Dr. Babasaheb Ambedkar Marathwada University | Jadhav K.M.,Dr. Babasaheb Ambedkar Marathwada University | Shengule D.R.,Vivekanand Arts and Sardar Dalipsing Commerce and Science College
Solid State Phenomena | Year: 2014

The magnetic nano-particles of nickel ferrite were synthesized successfully by sol-gel autocombustion method using high purity metal nitrates and citric acid as chelating agent. The as prepared powder of nickel ferrite was sintered at 550°C for 5 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 nano-particles. The X-ray diffraction pattern shows the Bragg's peak which belongs to cubic spinel structure. The values of lattice constant, X-ray density, oxygen parameter and radii of tetrahedral and octahedral sites were calculated from XRD data. The average crystallite size was estimated using Scherrer's formula and found to be 6 nm. 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 these nickel ferrite nano-particles has been discussed on the basis of hopping of electrons. © (2014) Trans Tech Publications, Switzerland. Source

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