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Structural properties, impedance, dielectric and electric modulus spectrahave been used to investigate the sintering temperature (Ts) effect on thesingle phase cubic spinel Ni0.6Zn0.4Fe2O4 (NZFO) ceramics synthesized bystandard ceramic technique. Enhancement of dielectric constants is observedwith increasing Ts. The collective contribution of n-type and p-type carriersyields a clear peak in notable unusual dielectric behavior is successfullyexplained by the Rezlescu model. The non-Debye type long range dielectricrelaxation phenomena is explained by electric modulus formalism. Fast responseof the grain boundaries of the sample sintered at lower Ts sample leading tosmall dielectric spin relaxation time, t (several nanoseconds) have beendetermined using electric modulus spectra for the samples sintered at differentTs. Two clear semicircles in impedance Cole-Cole plot have also beensuccessfully explained by employing two parallel RC equivalent circuits inseries configuration taking into account no electrode contribution. Such a longrelaxation time in NZFO ceramics could suitably be used in nanoscale spintronicdevices.

Structural Properties, Impedance Spectroscopy and Dielectric Spin Relaxation of Ni-Zn Ferrite Synthesized by Double Sintering Technique