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The Influence of Incorporation of Al3+ Ions on the AC Electrical and Dielectric Properties of Ni Spinel Ferrites
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Volume 5, 2017
Issue 4 (August)
Pages: 32-36   |   Vol. 5, No. 4, August 2017   |   Follow on         
Paper in PDF Downloads: 15   Since Oct. 25, 2017 Views: 401   Since Oct. 25, 2017
Hussein Dawoud, Department of Physics, Islamic University, Gaza, Palestine.
The mixed spinel ferrites NiAlxFe2-xO4 with different concentrations of Al content i.e. x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5, were prepared by using the standard double sintering technique by mixing high purity metal oxidesAl2O3, NiO and Fe2O3. Two probe electrode method was used at room temperature to determine the ac electrical conductivity (σac), real dielectric constant (ε') and imaginary dielectric constant (ε''), and the dielectric loss tangent (tan δ) over a variable applied frequency in range of (10KHz – 1MHz). σac shows a continuous increasing with the increasing of the applied frequency. The obtained results from the dielectric parameter for all the samples decreases with increasing of frequency, which indicated to normal spinel ferrite behavior. The variation of ac and dielectric parameters were explained on the basis of electronic exchange between the ferric ions (Fe3+) and ferrous ions (Fe2+) or trivalent nickel ions (Ni 3+) and divalent nickel ions (Ni 2+). The experimental results reveal that the ac electrical and dielectric properties, which can be influenced changed by substitution of the Al content in Ni spinel ferrites. These results of the mixed Al-Ni spinel ferrite suggest uses as a soft ferrite material, which can be used for different an interesting technological and scientific applications.
Al-Ni Spinel Ferrite, Dielectric Properties, ac Electrical Conductivity
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