Abstract
Designing perovskite ceramics using high-entropy strategies provide new opportunities for the development of high-performance dielectric energy storage materials. However, only a few studies have been reported in this area so far. In this study, novel high-entropy perovskite ceramics have been designed for the (1-x)(Bi0.4K0.2Na0.2Ba0.2)TiO3–xSr(Mg1/3Ta2/3)O3 system by considering various synergistic effects. The structures and properties of the ceramics were systematically studied. The results showed that the ceramics exhibited strong relaxation behavior and excellent energy storage performance. The ceramic with x = 0.12 had a recoverable energy density of 3.40 J/cm3 and an energy storage efficiency of 86.3% under a medium electric field of 290 kV/cm. The results also showed that the ceramic exhibited outstanding thermal stability, frequency stability, fatigue resistance, and good reliability. The results suggest that ceramics are potential candidates for dielectric energy storage applications in low-to-medium electric fields.
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