期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 105, 期 2, 页码 1083-1094出版社
WILEY
DOI: 10.1111/jace.18129
关键词
dielectric properties; ferroelectric materials; nanostructures; perovskite; phase transition
资金
- Foshan Xianhu Laboratory of the Advanced Energy Science andTechnologyGuangdong Laboratory, China
High-entropy ceramics (HECs) (Bi0.2Na0.2K0.2La0.2Sr0.2)TiO3 (BNKLST) with a single-phase perovskite structure were successfully prepared by a modified citrate acid method. Compared to (Bi0.5Na0.5)TiO3 (BNT) ceramics, BNKLST HECs exhibit dense nanostructures with improved electrical and dielectric properties at elevated temperatures, making them promising dielectrics for electrical energy storage applications.
High-entropy ceramics (HECs) (Bi0.2Na0.2K0.2La0.2Sr0.2)TiO3 (BNKLST) with single-phase perovskite structure have been successfully prepared by a modified citrate acid method. In comparison to (Bi0.5Na0.5)TiO3 (BNT) ceramics prepared by the same synthesis route, the BNKLST HECs exhibit dense nanostructures with grain sizes as small as 45 nm, which are suggested to be responsible for the significantly improved electric breakdown fields and reduced leakage currents in the ceramics, and they have much enhanced elastic modulus owing to the entropy-stabilized perovskite structure. The electrical and dielectric characterizations reveal that BNKLST has high electrical resistances and dielectric constants at elevated temperatures, and, in particular, a recoverable energy storage density of 0.959 J/cm(3) can be achieved under an applied electric field of 180 kV/cm. Moreover, the energy storage efficiency in BNKLST can be maintained to be larger than 90% at 40-200 degrees C. These excellent properties suggest that entropy-stabilized BNT-based ceramics are promising dielectrics for electrical energy storage applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据