In this work, a novel 0–3 type SrBiTiO: AlO composite ceramic is designed for dielectric capacitor applications. A superior energy density of 5.96 J/cm, a high current density of 1099 A/cm² and a remarkable power density of 198 MW/cm³ are concurrently achieved in the ceramic specimen due to the great enhancement of the breakdown strength. The microstructure and physical property characterization confirm that highly insulating AlO particles existed in the ceramic matrix. It is evident that reduced grain sizes, the enhanced band gap energy and the increased activation energy contribute to the improvement of the breakdown strength. Ulteriorly, numerical simulations reveal that the primary factor might be ascribed to the decreased grain size. These findings demonstrate that the 0–3 type SrBiTiO: AlO composite ceramic is a promising candidate for energy storage applications.

中文翻译：

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具有优异储能性能的0-3型Sr0.7Bi0.2TiO3：Al2O3复合陶瓷的击穿强度增强及相关机理

在这项工作中，设计了一种新型 0-3 型 SrBiTiO: Al2O 复合陶瓷，用于介电电容器应用。由于击穿强度的大幅提高，陶瓷样品同时实现了 5.96 J/cm2 的优异能量密度、1099 A/cm2 的高电流密度和 198 MW/cm3 的卓越功率密度。微观结构和物理性能表征证实陶瓷基体中存在高度绝缘的Al2O3颗粒。显然，减小的晶粒尺寸、增强的带隙能和增加的活化能有助于提高击穿强度。最终，数值模拟表明，主要因素可能归因于晶粒尺寸的减小。这些发现表明，0-3型SrBiTiO:Al2O复合陶瓷是储能应用的有前途的候选者。