电容器
电介质
储能
陶瓷
化学
铁电性
烧结
铁氧体(磁铁)
介电强度
光电子学
复合材料
电压
电气工程
材料科学
功率(物理)
热力学
工程类
物理
作者
Zhan‐Nan Guan,Jiajia Wang,Tianze Pan,Shouxin Zhang,Jing Wang,Yaojin Wang
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2023-01-09
卷期号:62 (3): 1234-1239
被引量:19
标识
DOI:10.1021/acs.inorgchem.2c03824
摘要
Dielectric capacitors have become an important component in current pulsed power devices and thus have attracted great research interest in recent years. Among all kinds of dielectric materials, the bismuth ferrite (BiFeO3)-based ceramic capacitors show possible applications in dielectric energy storage because of their large polarization. However, the relatively high conductivity badly limits the improvement of electric breakdown strength, thus leading to low energy density. Herein, the perovskite end-member La(Mg2/3Nb1/3)O3 and sintering aid MnO2 were simultaneously introduced into BiFeO3-SrTiO3 solid solutions to improve the relaxation features and electric breakdown strength. Accordingly, a high recoverable energy density of 6.3 J/cm3 and an acceptable efficiency of 74.3% were realized under 450 kV/cm. In addition, the good frequency/thermal stability and superior charge-discharge performances were also realized. This work provides feasible approaches to modify the capacitive energy storage of BiFeO3-based relaxor ferroelectric ceramics.
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