Microstructure and frequency dependent electrical properties of lead-free Na<inf>0.5</inf>Bi<inf>0.5</inf>TiO<inf>3</inf> perovskite

Single phase Pb-free Na0.5Bi0.5TiO3 ceramics are synthesized with rhombohedral structure. Cold isostatic pressing of NBT green pellets at 200 MPa ensured better sinterability that is reflected in the dense micrograph and uni-modal grain size distribution. Grain, grain boundary and space charge effect contributions towards electrical properties are distinctly observed from the impedance study at different temperature range. Frequency dependence of real Z∗, Im Z∗ and ac conductivity studies provides useful information about relaxation and conduction mechanism.