Two groups of the ferrite samples of the general formula Ni0.5Zn0.5YyFe2-iyO4; were prepared by double sintering ceramic method. The first group, i=1, 0.02 y 0.12 i.e. the Fe ion was partially substituted the Y ion. The second group; i=0, 0.02 y 0.08 i.e. the Y ion was added to the Ni0.5 Zn0.5Fe2O4. The influence of Y3+ ion on the electrical properties of the two groups of the investigated samples is studied. It is noticed that the ac conductivity (ln) are nearly constant for all Y3+ ion concentration for the two groups. This result confirm the x-ray diffraction data and the calculated values of the cation distribution, where the process of dissolution of any ratio of yttrium in the cubic spinel lattice never occurs but exists outside the grain as aggregation and the non stoichiometeric system can redistribute itself to produce a single phase of cubic spinel under the suitable sintering process. The obtained results indicate that the ac conductivity of the investigated samples is controlled by hopping mechanism. The dielectric constant (ε′) as well as dielectric loss (tanδ) change. The obtained result is discussed in view of Maxwell–Wagner process.
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