Achieving high energy-storage density in K0.5Na0.5NbO3 optimized Bi0.25Na0.25Ba0.15Sr0.35TiO3 relaxor ferroelectric ceramics

Lead-free ceramics with high energy-storage density and dielectric stability are attracted considerable attention to address low-driven energy storage electronic fields. Here, the Bi0.25Na0.25Ba0.15Sr0.35TiO3 + K0.5Na0.5NbO3 (BNBST + Kx, x = 0, 2, 4, 6, 8, 10) ceramics were constructed to systematically investigate. All BNBST + Kx ceramics exhibited single pseudocubic perovskite structure with high bulk density. High energy storage density Wtotal = 2.3 J/cm3, recoverable energy storage density Wrec = 1.91 J/cm3 and efficiency η = 84