“…For example, the technique of co-doping at the A and B site of perovskite structure of BNKT ceramics with dopants such as Ta [253], Nb [254], Zr [255], Hf [256], Mn [257], Li [258], and La [259], etc reported improved piezoelectric and energy storage applications [72,[260][261][262]. Details of co-doped ferroelectric BNT-systems are also reported elsewhere [72,[260][261][262][263][264][265][266][267]. Similarly, the co-doped system of 0.96[{Bi 0.5 (Na 0.84 K 0.16 )} 1−x−y Li x Mg y (Ti 1−z Nb z ) 3 ] -0.04SrTiO 3 reported enhanced energy storage performance in a temperature range of 100 • C-150 • C, with an energy storage density of 0.70 J cm −3 at an electric field of 5.5 kV mm −1 [260].…”