Dielectric behaviour of erbium substituted Mn-Zn ferrites |
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Authors: | D Ravinder K Vijaya Kumar |
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Affiliation: | (1) Department of Physics, Osmania University, 500 007 Hyderabad, India |
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Abstract: | 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−xErx04 (where itx = 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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Keywords: | Dielectric constant dielectric loss tangent Mn-Zn-Er ferrites electrical resistivity |
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