High energy storage properties of Nd(Mg2/3Nb1/3)O3 modified Bi0.5Na0.5TiO3 lead-free ceramics

This study proposes an optimization strategy to improve the energy storage performance of Bi0.5Na0.5TiO3 (BNT)-based ceramics. The strategy is to reduce the grain size, break the long-range polar ordering, form disordered polar nanoregions (PNRs), and increase the breakdown field strength (E-b). The (1-x)Bi0.5Na0.5TiO3-xNd(Mg2/3Nb1/3)O-3 ((1-x)BNT-xNMN, x = 0.05, 0.10, 0.15 and 0.20) ceramics were prepared using this optimization strategy, and an ultrahigh recoverable energy storage density of 2.72 J/cm(3) and an efficiency of 91.74% were obtained. Notably, this marks a several times increase in energy storage density compared to pure BNT ceramics. The energy storage density exhibits excellent electrical stability in the temperature range of 20-160 degrees C and frequency range of 1-200 Hz. Additionally, the power density (P-D) of the ceramic reaches 19.74 MW/cm(3) at an electric field of 180 kV/cm. These findings hold great promise as to pave the way for the development of cutting-edge energy storage solutions and high-performance capacitor materials.