Relaxor ferroelectrics are the primary candidates for high-performance energy storage dielectric capacitors. Here, stress engineering, which was realized by optimizing the lattice mismatch between (Na_0.5Bi_0.5)TiO₃ film and SrRuO₃/(La_0.5Sr_0.5)CoO₃ bottom electrodes, was used to enhance the energy storage performance of (Na_0.5Bi_0.5)TiO₃ relaxor ferroelectric film. As a result, in-plane compressive stress caused by the lattice mismatch between (Na_0.5Bi_0.5)TiO₃ film and (La_0.5Sr_0.5)CoO₃ bottom electrode leads to a large W_rec of 45.7 J/cm³ with η of 79.4% at 2000 kV/cm in (Na_0.5Bi_0.5)TiO₃ film, which is 54.4% higher than that of (Na_0.5Bi_0.5)TiO₃ film with in-plane tensile stress. In addition, the W_rec of (Na_0.5Bi_0.5)TiO₃ film with in-plane compressive stress shows good thermal stability and frequency stability with variations of 5.8% at 30–120 °C and 6.9% at 0.2–20.0 kHz. This work may provide some new perspectives for the design of dielectric capacitors with high energy storage performance.

中文翻译：

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应力工程诱导的 （Na0.5Bi0.5）TiO3 薄膜的高储能性能


弛豫铁电体是高性能储能电介质电容器的主要候选者。在这里，通过优化 （Na_0.5Bi_0.5）TiO₃ 薄膜和 SrRuO₃/（La_0.5Sr_0.5）CoO₃ 底部电极之间的晶格失配来实现应力工程，以增强 （Na_0.5Bi_0.5）TiO₃ 弛豫铁电薄膜的储能性能。结果，（Na_0.5Bi_0.5）TiO₃ 薄膜和 （La_0.5Sr_0.5）CoO₃ 底部电极之间的晶格失配引起的面内压应力导致 （Na_0.5Bi_0.5）TiO₃ 薄膜中 2000 kV/cm 时 W_rec 为 45.7 J/cm^3，η为 79.4%，比 （Na_0.5Bi_0.5）TiO₃ 高 54.4%具有面内拉伸应力的薄膜。此外，具有面内压应力的 （Na_0.5Bi_0.5）TiO₃ 薄膜的 W_rec 表现出良好的热稳定性和频率稳定性，在 30–120 °C 时变化为 5.8%，在 0.2–20.0 kHz 时变化为 6.9%。这项工作可能为高储能性能的介电电容器的设计提供一些新的视角。