• K Vijaya Kumar

      Articles written in Bulletin of Materials Science

    • Dielectric behaviour of erbium substituted Mn–Zn ferrites

      D Ravinder K Vijaya Kumar

      More Details Abstract Fulltext PDF

      Dielectric properties such as dielectric constant (𝜀') and dielectric loss tangent (tan ⋹ 𝛿) of mixed Mn–Zn–Er ferrites having the compositional formula Mn0.58Zn0.37Fe2.05–𝑥Er𝑥O4 (where 𝑥 = 0.2, 0.4, 0.6, 0.8 and 1.0) were measured at room temperature in the frequency range 1–13 MHz using a HP 4192A impedance analyser. Plots of dielectric constant (𝜀') vs frequency show a normal dielectric behaviour of spinel ferrites. The frequency dependence of dielectric loss tangent (tan 𝛿) was found to be abnormal, giving a peak at certain frequency for all mixed Mn–Zn–Er ferrites. A qualitative explanation is given for the composition and frequency dependence of the dielectric constant and dielectric loss tangent. Plots of dielectric constant vs temperature have shown a transition near the Curie temperature for all the samples of Mn–Zn–Er ferrites. However, Mn0.58Zn0.37Er1.0Fe1.05O4 does not show a transition. On the basis of these results an explanation for the dielectric mechanism in Mn–Zn–Er ferrites is suggested.

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