Abstract
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) (Na0.47Bi0.47Ba0.06)TiO3-xBa(Mg1/3Ta2/3)O3 lead-free ceramics. The results showed that all the sintered samples owned a perovskite structure, and dense microstructure. Furthermore, with Ba(Mg1/3Ta2/3)O3 doping level increasing, the peak of εr shifts to a lower temperature, and becomes boarder. Interestingly, the superior recoverable energy density (Wrec)⁓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 Na0.5Bi0.5TiO3 lead-free dielectric ceramics capacitors.
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