Abstract
Zr and Cu Ni0.5Zn0.5Fe2O4 ferrites have been prepared by the sol-gel auto combustion method using the nitrates. The ethylene glycol and citric acid were mixed as the combustion agents. The synthesized powders were calcinate at 800°C for 3h and they are pressed in desired shaped and sintered at 1200°C for 2h in air atmosphere. The X-ray diffraction analysis confirms the single phase cubic spinel structure. The SEM pictures revels that the substitution of higher valence ions results fine grained intragranular pore free microstructure. The dielectric properties of substituted ferrites exhibits decreasing trend at lower frequencies up to 1000Hz beyond which it should in stable response. All the results are explained in terms of compositional and frequency variation.
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