Achieving high energy storage density under low electric field in modified bismuth sodium titanate ceramics

In this work (0.85-x)Na0.5Bi0.5TiO3-0.15NaNbO3-xSr0.85Bi0.1TiO3 ceramic system abbreviated as (NBT-NN-xSBT) was prepared through the conventional solid-state method. The effect of doping level on crystal structures, microstructures, dielectric, and energy-storage properties were investigated in-detail. The coexistence of rhombohedral (R3C) and tetragonal (P4bm) phases greatly contribute in the enhancing of saturation polarization with low remnant polarization under low electric field. Since high energy storage density has been achieved. The optimum sample showed a decent combination of electrical properties such as recoverable energy-storage density (Wrec = 3.94 J/cm3), efficiency (η = 84%), power density (~ 133 MW/cm3) and a rapid discharge rate of 31 ns as well. This noteworthy combination of electrical properties might be promising for high pulse power technology applications.