Optimization of polarization and electric field of bismuth ferrite-based ceramics for capacitor applications

材料科学 陶瓷 电场 铋铁氧体 电容器 烧结 铁氧体(磁铁) 极化(电化学) 储能 功率密度 脉冲功率 电气工程 工程物理 光电子学 电压 复合材料 冶金 电介质 功率(物理) 铁电性 工程类 多铁性 化学 物理 物理化学 量子力学
作者
Fei Yan,Yunjing Shi,Xiaofeng Zhou,Kun Zhu,Bo Shen,Jiwei Zhai
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:417: 127945-127945 被引量:148
标识
DOI:10.1016/j.cej.2020.127945
摘要

For the purpose of meeting the requirements of protecting environment and sustainable development, bismuth ferrite (BiFeO3, BF)-based lead-free ceramics have gained immense attention for pulsed power capacitor applications due to their large spontaneous polarization, low sintering temperature as well as non-toxic and harmless. However, the low energy storage properties (ESPs) and unstable performance of BF-based ceramics are not good for practical applications. In this work, novel bismuth ferrite-based lead-free ceramics of (1-x)(0.67BiFeO3-0.33BaTiO3)-xNa0.73Bi0.09NbO3 ((1-x)BFBT-xNBN) were designed and fabricated successfully by optimizing the polarization and electric field. With increasing the content of NBN, the remnant polarization decreased rapidly as well as the slim and pinched polarization-electric field loops together with high electric field can be observed. Notably, ultrahigh ESPs with the total energy storage density (Wtot) of 6.65 J cm−3 and the recoverable energy storage density (Wrec) of 5.57 J cm−3 can be achieved at high electric field of 410 kV cm−1. At the same time, the η is greater than 80% and the variation of Wrec is less than ±5% over a broad frequency range (1–100 Hz) and temperature range (30–150 °C). In addition, the η is stabilized around 89% and the variation of Wrec is less than ± 2% after 104 cycles. Therefore, the (1-x)BFBT-xNBN lead-free ceramics not only possess ultrahigh ESPs but also the ESPs exhibit outstanding stability, which is promising candidates for high performance pulsed power capacitor applications.
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