Abstract
The frequency dependent transport properties of tungsten bronze structured ceramic Na2Pb2La2W2Ti4Nb4O30 prepared through solid state reaction route is reported in this paper. Preliminary X-ray diffraction studies confirm the formation of compounds with orthorhombic crystal structure. Complex Impendence spectroscopy (CIS) technique is used to identify the physical processes involved in deciding the transport properties of the compound. In the spectroscopic plot of imaginary part of impedance and modulus a temperature dependent relaxation process of Arrhenius type is observed in the material. The relaxing species were identified from the magnitudes of calculated activation energies. The real and imaginary part of complex impedance and modulus traced depressed semicircle suggesting non Debye type relaxation process in the materials. These semicircles are successfully modeled by introducing constant phase element (CPE) to the equivalent circuit along with resistance(s), capacitance(s).
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