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.
Highlights
Ni-Zn ferrite is of greater commercial application in the electromagnetic interfaces known as EMI, which is used in hard disk drives, in laptops and other electronic products
The electrical resistivity of ferrites decreases with the increase of temperature, which shows that ferrites have semiconductor behavior
The activation energy has been found smaller in ferro magnetic region than para magnetic region [5-7]
Summary
Ni-Zn ferrite is of greater commercial application in the electromagnetic interfaces known as EMI, which is used in hard disk drives, in laptops and other electronic products. The electrical resistivity of ferrites decreases with the increase of temperature, which shows that ferrites have semiconductor behavior. Ferrites have very high resistivity which is one of the considerations for microwave applications The electrical properties of ferrites are sensitive to preparation method, sintering temperature, sintering time, rate of heating and rate of cooling [1,2]. Ni-Zn ferrite a systematic investigation about electrical properties is lacking, so there is a need for investigation of electrical properties on Ni-Zn ferrite to understand general properties. In this communication we are reporting electrical properties of Ni-Zn ferrite synthesized by citrate precursor method
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