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Frequency, temperature and In³⁺ dependent electrical conduction in NiFe₂O₄ powder

A series of polycrystalline spinel ferrites with the composition NiInₓFe₂₋ₓO₄ (0≤x≤0.3) were prepared by the solid state reaction to study the effect of In³⁺ ions substitution on their dc electrical resistivity and dielectric properties. The dc resistivity has been investigated as a function of temp...

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Bibliographic Details
Published in:Powder technology 2011-09, Vol.212 (1), p.218-223
Main Authors: Shirsath, Sagar E, Toksha, B.G, Mane, Maheshkumar L, Dhage, V.N, Shengule, D.R, Jadhav, K.M
Format: Article
Language:English
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Summary:A series of polycrystalline spinel ferrites with the composition NiInₓFe₂₋ₓO₄ (0≤x≤0.3) were prepared by the solid state reaction to study the effect of In³⁺ ions substitution on their dc electrical resistivity and dielectric properties. The dc resistivity has been investigated as a function of temperature and composition. The indium ion increases the dc resistivity and activation energy of the system. A study of the dielectric properties of these mixed ferrites, as a function of composition, frequency and temperature, has been undertaken. The dielectric constant (ε′), dielectric loss (ε″) and dielectric loss tangent (tanδ) all decreases with frequency as well as with the composition. The dielectric constant (ε′) and dielectric loss tangent (tanδ) were increases with increasing temperature. AC conductivity increases with increase in applied frequency. The dielectric behavior of the present samples is attributed to the Maxwell–Wagner type interfacial polarization. The conduction mechanism in these ferrites is due to electron hopping between Fe²⁺ and Fe³⁺ ions on adjacent octahedral sites.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2011.05.019