Abstract
The effects of ZrO2 addition on the microstructure, dielectric properties, and energy storage performance of Bi0.5Na0.5TiO3–Bi0.5K0·5TiO3–BaTiO3–Sr(Mg1/3Nb2/3)O3 (BBNKT-SMN) ceramics were systematically investigated. The XRD results show that ZrO2 dissolved in the perovskite matrix without any detectable secondary phases. ZrO2 doping can improve densification, grain growth, and energy storage performance. The sample doped with 4 mol% ZrO2 exhibited excellent dielectric thermal stability, meeting the Z9R specification and having potential applications in high-temperature capacitors. Finally, an optimal recoverable energy storage density Wrec = 3.0 J/cm3 at 260 kV/cm and a high energy storage efficiency η = 88.2% were achieved. In addition, this ceramic exhibited excellent thermal stability (30–180 °C), frequency insensitivity (1–100 Hz), and high-cycle stability (up to 104). This study further demonstrates that the addition of ZrO2 is a simple and effective way for improving the thermal stability of the dielectric and the energy storage performance.
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