Abstract
The lead-free solid-solution (1-x)Ba0.06(Na0.5Bi0.5)0.94TiO3-xNaNbO3; 0 ≤ x ≤ 1.0 have been prepared by the conventional solid-state reaction method and their electrical impedance and conductivity was studied employing the impedance spectroscopy method in the range starting from room temperature to 500°C, with the step of 2°C. The X-ray diffraction analysis of all the compounds confirmed the successful formation of solid-solutions. Ac conductivity registered an increment with the increasing frequency for all the compositions over the entire temperature range. Also, a transfer from low impedance to high impedance was observed with the increasing NaNbO3 content in Ba0.06(Na0.5Bi0.5)0.94TiO3. To ascertain the conduction mechanism, the ac conductivity and its frequency exponent have been analyzed by a theoretical model based on correlated barrier hopping.
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