Abstract
Mixed Mg-Cr Nano ferrites having the compositional formula MgCrxFe2-xO4 (where x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1.0) were synthesized using Citrate-Gel auto combustion method. Structural characterization was carried out by XRD Analysis which confirmed the formation of single phase cubic spinel structure without any impurity peak. The dielectric properties such as Dielectric constant (ε'), Dielectric Loss tangent (tan δ) and AC conductivity (σAC) of Mg-Cr nano ferrites were studied at room temperature in the frequency range of 2 Hz - 2 MHz using Agilent E4980A Precision LCR meter. The dielectric constant, loss tangent and AC conductivity shows a normal behavior with frequency. A qulitative explanation is given for composition and frequency dependance of the dielectric constant, dielectric loss tangent and AC conductivity of the nano ferrite. The loss tangent for the synthesized samples was found to be decreased from 0.09 to 0.054 in higher frequency region showing the potential applications of these materials in high frequency micro wave devices. On the basis of these results the explanation of dielectric mechanism in Mg-Cr ferrites is suggested.
Highlights
Nano ferrites have many applications in high frequency devices and they play a useful role in technological applications
The dielectric properties such as Dielectric constant (ε'), Dielectric Loss tangent and AC conductivity of Mg-Cr nano ferrites were studied at room temperature in the frequency range of 2 Hz - 2 MHz using Agilent E4980A Precision LCR meter
In this article we report the influence of Cr substitution on structural and dielectric properties of MgCrxFe2−xO4 ferrites synthesized by Citrate-gel auto combustion method as a function of frequency and composition at room temperature
Summary
Nano ferrites have many applications in high frequency devices and they play a useful role in technological applications. Owing to the dielectric behavior, they are sometimes called multiferroics They are commercially important because they can be used in, many devices such as Phase Shifter, high frequency transformer cores, switches, resonators, computers, TVs and mobile phones [2,3]. Since MgFe2O4 and related ferrites are widely used components in micro wave family due to their high electrical resistivity, low magnetic and dielectric losses [6,7] we investigated the dielectric behavior of these ferrites over wide range of frequencies at room temperature. In this article we report the influence of Cr substitution on structural and dielectric properties of MgCrxFe2−xO4 ferrites synthesized by Citrate-gel auto combustion method as a function of frequency and composition at room temperature
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