Abstract
The Pb0.9Bi0.1Fe0.7W0.3O3(PBFW) solid solution was successfully synthesized by the modified two-step solid state reaction method. Room temperature X-ray diffraction (XRD) confirms the Psuedocubic structure with Pm-3m space group and the lattice parameter a = 3.9756(6) Å. Frequency dependent dielectric permittivity and loss tangent were studied in the temperature range from 313 to 528 K. High dielectric permittivity at low-frequency region reveals the contribution of space charge polarization originated by the chemically 1:1 B site order in the system. Origin of SCP or Maxwell-Wagner polarization indicates the compositional heterogeneity in the ceramic. By observing the depressed semicircle in the cole –cole plot of impedance and well-fitting of Kohlraush-Williams-Watt function to the electric modulus reveals the PBFW follows the non-Debye type of relaxation mechanism and peak shifting reveals the transition of long range to short range mobility of charge carriers. The calculated activation energy from all the above studies confirms the presence of space charges in both grain and grain boundary; those are involved in the relaxation and conduction mechanism in all measured temperatures. Fitted Johnscher's power law for AC conductivity gives polaronic hopping conduction mechanism.
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