ABSTRACT: Magnesium nickel ferrites were synthesized by employing sol gel technique at 1473 K sintering temperature. A critical Rietveld analysis of XRD reveals that the presence of a very small amount of NiO phase along with the ferrite phase. It indicates that almost a stoichiometric (Mg,Ni)-ferrite phase has been obtained at 1473 K. SEM image shows that of (MgNi) ferrite is regular in shape have granular in structure, compact and well connected grain to each others. The ac conductivity increases with increase in applied frequency. The magnesium nickel ferrite (MnNiFe2O4) shows σac conductivity of 1.2 x 10-4 S/cm. This is may be attributed to the dipole polarization i.e., the rotation of dipoles between two equivalent equilibrium positions is involved. The high value of dielectric constant of the sample MnNiFe2O4 may be the structural changes associated with the magnesium nickel ferrite when the grain size is reduced. Therefore, this ferrites material is attracted to use in many science and technological applications
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