材料科学
电介质
陶瓷
X射线光电子能谱
钙钛矿(结构)
储能
分析化学(期刊)
热力学
化学工程
复合材料
光电子学
有机化学
物理
工程类
功率(物理)
化学
作者
Chenhe Zhou,Xiaoyan Zhang,Shuning Li,Jinhua Yan,Xiwei Qi
标识
DOI:10.1016/j.ceramint.2022.01.326
摘要
A series of single-phase (La0.5Li0.5)x[(Bi0.5Na0.5)0.25Ba0.25Sr0.25Ca0.25]1-xTiO3 high-entropy perovskite ceramics were designed and successfully synthesized via conventional solid state reaction method. The results of dielectric properties indicate that all samples in different proportions exhibit excellent frequency stability at a wide frequency range (102–106 Hz) and quintessential relaxation phenomenon. An optimal dielectric constant (εr = 920) with low dielectric loss (tanδ = 0.015) was achieved for x = 0.20, which is represented as equimolar high-entropy ceramic. It can be demonstrated that an amazing energy storage efficiency of 95.3% and a discharge density of 1.23 × 10−2 J/cm3 can be simultaneously achieved in x = 0.24 ceramics. Furthermore, it is confirmed by X-ray photoelectron spectroscopy that the charge compensation mechanism and the oxygen vacancies synergistically cause more Ti4+ to be reduced, which rationalizes the elevated dielectric properties. We believe that entropy engineering is a credible strategy for tailoring material properties.
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