Markedly improved energy-storage performance of Na0.5Bi0.5TiO3-based ferroelectric ceramics through introducing Ba(Mg1/3Ta2/3)O3 non-polar phase.

Eco-friendly dielectric energy-storage ceramics capacitors are extremely urgent for pulsed power system applications. Unfortunately, it is a grand challenge to boost the energy-storage properties. In this study, we make use of a composition driven strategy to refine microstructures, enhance dielectric relaxation, and adjust phases composition of (1- x) (Na 0.47 Bi 0.47 Ba 0.06)TiO 3 - x Ba(Mg 1/3 Ta 2/3)O 3 lead-free ceramics. The results showed that all the sintered samples owned a perovskite structure, and dense microstructure. Furthermore, with Ba(Mg 1/3 Ta 2/3)O 3 doping level increasing, the peak of ε r shifts to a lower temperature, and becomes boarder. Interestingly, the superior recoverable energy density (W rec)⁓5.9 J/cm3 and energy efficiency (η) ⁓82.3% values are simultaneously received for the x = 0.14 ceramic, respectively. Moreover, the above sample also illustrates positive temperature (25–120 °C) and frequency (1–500 Hz) energy-storage stabilities. Meanwhile, a power density of 59.2 MW/cm3, as well as a discharge speed time of 199 ns are also obtained in the x = 0.14 ceramic. It is believed that this work will give a helpful guideline for the promotion of Na 0.5 Bi 0.5 TiO 3 lead-free dielectric ceramics capacitors. [ABSTRACT FROM AUTHOR]