Abstract
Abstract Electrical conductivity study of a lead-free 0.95Na0.5Bi0.5TiO3-0.05SrTiO3 ceramic was investigated by impedance spectroscopy in the high temperature range from 400 °C to 650 °C. A substantial decrease in conductivity was observed as compared to the previously reported NBT based samples. Frequency and temperature dependent ac conductivity analysis was done employing some empirical models. In this temperature range, the temperature dependence of frequency exponent ‘S’ suggests the dominance of co-related barrier hopping (CBH) for ac conduction. The sample shows non-Debye type of relaxation which is explained adequately by using Gaussian and modified KWW functions.
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