Abstract
The rapid progress of science and technology miniaturizes and integrates pulse power capacitors. High electric fields constrain miniaturized size applications and electric device integration; hence, ceramics with substantial recovered energy density (Wrec) at comparatively low electric fields are sought for high energy storage capacitors. Herein, (1-x)Na0.5Bi0.5TiO3-x(Sr0.7Bi0.2)(Ti0.8Zr0.2)O3 ((1-x)NBT-xSBTZ) lead–free ceramics with good energy storage properties were fabricated by solid-state reaction. The phase structures, dielectric properties, relaxation behavior, breakdown behavior, and energy storage properties were systematically investigated by the experiments and simulation method. Phase structure of NBT-based shifts from rhombohedral to pseudo-cubic phase and the relaxor behavior increases with SBTZ content. In addition, the 0.70NBT-0.30SBTZ ceramic demonstrates commendable temperature (25–150 °C) and frequency (1–200 Hz) stability at 120 kV·cm–1. A substantial power density of 40.48 MW·cm–3 and a fast discharge speed of 90.4 ns were attained. This research broadens the potential uses for ceramic capacitors operating in low electric field.
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