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Impedance and modulus analysis of the (Na0.6Ag0.4)2PbP2O7 compound
Authors:Haibado MahamoudB Louati  F HlelK Guidara
Affiliation:University of Sfax, Laboratory of solid state, Faculty of sciences, B. P. 1171, 3000 Sfax, Tunisia
Abstract:The electrical properties of the (Na0.6Ag0.4)2PbP2O7 compound were studied using the complex impedance spectroscopy in the temperature range (502-667 K). Grain interior, grain boundary and electrode-material interface contributions to the electrical response are identified by the analysis of complex plan diagrams. The imaginary part of the modulus at several temperatures shows a double relaxation peaks, furthermore suggesting the presence of grains and grain boundaries in the sample. An analysis of the dielectric constants ?′, ?″ and loss tangent tan(δ) with frequency shows a distribution of relaxation times. The dc conductivity of the material is thermally activated with an activation energy about 0.8 eV which is in the vicinity of the that obtained from tan(δ) (E = 0.7 eV) and modulus (Em = 0.68 eV) studies.
Keywords:Impedance spectroscopy  Modulus  Dielectric  Equivalent circuit
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