Abstract
The complex impedance spectroscopy study of magnesium niobate Mg4Nb2O9
(MN) ceramics with different additions of V2O5 (0%, 2%, 5%) was
performed in this present paper. The preparation of MN samples were
carried out by using the solid-state reaction method with a high-energy
milling machine. Frequency and temperature dependence of the complex
impedance, complex modulus analysis, and conductivity were measured and
calculated at different temperatures by using a network impedance
analyzer. A non-Debye type relaxation was observed showing a
decentralization of the semicircles. Cole-Cole formalism was adopted
here with the help of a computer program used to fit the experimental
data. A typical universal dielectric response in the frequency-dependent
conductivity at different temperatures was found. The frequency
dependent ac conductivity at different temperatures indicates that the
conduction process is thermally activated. The activation energy was
obtained from the Arrhenius fitting by using conductivity and electrical
modules data. The results would help to understand deeply the relaxation
process in these types of materials.
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