Wu Jianhua, Ma Ziyue, Yao Yuan, Sun Ningning, Zhao Ye, Li Yong, Liu Runchang, Hao Xihong
Inner Mongolia Key Laboratory of Ferroelectric-Related New Energy Materials and Devices, School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China.
Yunnan Longivy Technology Co., Ltd., Kunming 650217, China.
Materials (Basel). 2022 Jul 18;15(14):4981. doi: 10.3390/ma15144981.
Energy-storage capacitors based on relaxation ferroelectric ceramics have attracted a lot of interest in pulse power devices. How to improve the energy density by designing the structure of ceramics through simple approaches is still a challenge. Herein, enhanced energy-storage performances are achieved in relaxation ferroelectric 0.9 (0.94NaBiTiO-0.06BaTiO)-0.1NaNbO (NBT-BT-NN) ceramics by tuning sintering temperature. The original observation based on Kelvin probe force microscopy (KPFM) presented that the sintering temperature has a key effect on the electrical homogeneousness of the ceramics. It is found that a high electrical homogeneousness can induce quick and active domain switching due to the weakening of the constraint from built-in fields, resulting in a big polarization difference. This work provides a feasible strategy to design high-performance energy-storage ceramic capacitors.
基于弛豫铁电陶瓷的储能电容器在脉冲功率器件中引起了广泛关注。如何通过简单方法设计陶瓷结构来提高能量密度仍是一项挑战。在此，通过调节烧结温度，在弛豫铁电0.9(0.94NaBiTiO₃-0.06BaTiO₃)-0.1NaNbO₃（NBT-BT-NN）陶瓷中实现了增强的储能性能。基于开尔文探针力显微镜（KPFM）的原始观察表明，烧结温度对陶瓷的电学均匀性有关键影响。研究发现，由于内建电场约束的减弱，高电学均匀性可诱导快速且活跃的畴切换，从而导致较大的极化差异。这项工作为设计高性能储能陶瓷电容器提供了一种可行策略。
