Abstract Surface modified BaTiO3 were synthesized by coating BaTiO3 particles of 50/230 nm average grain size with 3 wt% Al2O3 and 1 wt% SiO2 (BTAS5/BTAS1). Multilayer ceramic capacitors (MLCC) were fabricated via two-steps sintering method. After sintering, average grain size (G) of BTAS5/BTAS1 MLCC slightly increased to 106/273 nm. Compared to BTAS1, BTAS5 MLCC with finer grains possessed higher breakdown strength (BDS), discharge energy density (Udischarge) and discharge/charge efficiency (Eeff). Moreover, great enhancement of BDS from 265 kV/cm to 651 kV/cm was obtained as dielectric thickness (D) of BTAS5 MLCC decreased from 68 μm to 19 μm, resulting in improvement of maximum discharge energy density (Umax) from 1.29 J/cm3 to 4.00 J/cm3. Linear relationship between power index of dielectric thickness and breakdown strength was observed, which could be described as B D S ∝ D - 0 . 397 . The results matched the model of Forlani and Minnaja well, with regard to the volume effects. Because of their low-cost, easily fabrication, lead-free, enhanced breakdown strength and improved discharge energy density, surface modified BaTiO3 multilayer ceramic capacitors can provide realistic solutions for high power energy storage applications.

中文翻译：

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介电厚度对表面改性BaTiO3多层陶瓷电容器储能性能的影响

摘要 通过用 3 wt% Al2O3 和 1 wt% SiO2 (BTAS5/BTAS1) 包覆平均粒径为 50/230 nm 的 BaTiO3 颗粒来合成表面改性 BaTiO3。多层陶瓷电容器 (MLCC) 是通过两步烧结方法制造的。烧结后，BTAS5/BTAS1 MLCC 的平均晶粒尺寸 (G) 略微增加至 106/273 nm。与 BTAS1 相比，具有更细晶粒的 BTAS5 MLCC 具有更高的击穿强度 (BDS)、放电能量密度 (Udischarge) 和放电/充电效率 (Eeff)。此外，随着 BTAS5 MLCC 的介电厚度 (D) 从 68 μm 降低到 19 μm，BDS 从 265 kV/cm 大幅提高到 651 kV/cm，从而使最大放电能量密度 (Umax) 从 1.29 J/ cm3 至 4.00 J/cm3。观察到电介质厚度的功率指数与击穿强度之间的线性关系，可以描述为 BDS ∝ D - 0 。397 . 在体积效应方面，结果与 Forlani 和 Minnaja 的模型非常匹配。由于其低成本、易于制造、无铅、增强的击穿强度和更高的放电能量密度，表面改性 BaTiO3 多层陶瓷电容器可以为高功率储能应用提供现实的解决方案。