材料科学
陶瓷
储能
电介质
掺杂剂
电容器
晶界
制作
兴奋剂
电场
光电子学
复合材料
电气工程
电压
微观结构
功率(物理)
热力学
替代医学
病理
工程类
物理
医学
量子力学
作者
Huijing Yang,Zhilun Lu,Linhao Li,Weichao Bao,Hongfen Ji,Jinglei Li,Antônio Feteira,Fangfang Xu,Yong Zhang,Huajun Sun,Zhichao Huang,Weichao Lou,Kexing Song,Shi‐Kuan Sun,Ge Wang,Dawei Wang,Ian M. Reaney
标识
DOI:10.1021/acsami.0c13057
摘要
Ceramic dielectrics are reported with superior energy storage performance for applications, such as power electronics in electrical vehicles. A recoverable energy density (Wrec) of ∼4.55 J cm–3 with η ∼ 90% is achieved in lead-free relaxor BaTiO3-0.06Bi2/3(Mg1/3Nb2/3)O3 ceramics at ∼520 kV cm–1. These ceramics may be co-fired with Ag/Pd, which constitutes a major step forward toward their potential use in the fabrication of commercial multilayer ceramic capacitors. Compared to stoichiometric Bi(Mg2/3Nb1/3)O3-doped BaTiO3 (BT), A-site deficient Bi2/3(Mg1/3Nb2/3)O3 reduces the electrical heterogeneity of BT. Bulk conductivity differs from the grain boundary only by 1 order of magnitude which, coupled with a smaller volume fraction of conducting cores due to enhanced diffusion of the dopant via A-site vacancies in the A-site sublattice, results in higher breakdown strength under an electric field. This strategy can be employed to develop new dielectrics with improved energy storage performance.
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