Abstract
Single lead-free Na0.73Bi0.09(Nb1-xTax)O-3 (x = 0, 0.10, 0.20, 0.30, and 0.40) ceramic phases were processed via a solid-state sintering route. The phase, microstructure, dielectric, and energy storage properties of the sintered ceramics were investigated. A high epsilon(r) > 1000, a recoverable energy storage density (W-rec) similar to 0.92 J/cm(3) along with ultra-high efficiency of 96.33% at 127 kV was obtained for x = 0 composition at room temperature. At x = 0.10, the value of W(rec )increased to similar to 1.13 J/cm(3) while the efficiency slightly decreased to similar to 95.7%. Furthermore, the discharging time of x = 0.10 composition was similar to 0.12 vts. These characteristics make the x = 0.10 composition a suitable candidate material for pulsed power applications.