Abstract
To meet the booming demands for advanced pulse power systems, developing dielectric ceramics with excellent energy storage performance is extremely urgent. In this work, a composition modulation strategy was adopted for designing Bi0.5K0.5TiO3-based ceramics. That is, incorporating Bi(Mg0.5Hf0.5)O3 into 0.6Bi0.5K0.5TiO3-0.4Sr0.7Bi0.2TiO3 matrix (abbreviated as (1-x)(BKT-SBT)-xBMH, x = 0.00, 0.04 and 0.08). The energy storage performance of the (1-x)(BKT-SBT)-xBMH ceramics was enhanced by increasing the breakdown strength. Ultimately, a recoverable energy density (Wrec) of 4.25 J/cm3 together with an efficiency (η) of 87 % was achieved for the x = 0.04 ceramic at 360 kV/cm. Furthermore, excellent energy storage properties (Wrec ≥ 2.71 J/cm3, η ≥ 85 %) were obtained over a wide range of temperatures (20–200 ℃), frequencies (0.5–100 Hz) and cycle numbers (105) under 260 kV/cm, indicating good thermal stability, frequency-independent character and fatigue-resistance behavior. Our work would open up a new avenue for preparing BKT-based dielectric ceramics.
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