Abstract
Polycrystalline samples of Pb(Mn1/2W1/2)O3 were prepared by the high-temperature solid-state reaction technique. Preliminary crystal structure and microstructure of the compound at room temperature were studied using the X-ray diffraction (XRD) technique and scanning electron microscopy (SEM), respectively. The dielectric permittivity (e) and loss tangent (tanδ) of the compound were obtained both as a function of frequency (0.5×103−104Hz), at room temperature, and temperature (30 °C–320 °C), at 10 kHz. Both the a.c. and d.c. conductivities have been studied over a wide range of temperature. The forbidden energy gap (Eg) and activation energy (Ea) of the compound were calculated from the plot of d.c. resistivity and a.c. conductivity versus inverse absolute temperature, respectively. The current density–field strength (J–E) characteristics of the compound studied at different temperatures reveals that the compound has excellent varistor behavior. The change in magnitude of the current with time was also studied at different voltage.
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