Shuai Chen, Ting Wang, Xiao-Ling Wang, Kai Li, Qing-Feng Zhu, Wei-Ping Gong, Ge Liu, Qing-Yuan Wang, Shao-Xiong Xie
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引用次数: 0
摘要
摘要高熵包晶石铁电材料因其显著的低残余极化和窄磁滞而备受关注。因此，这些材料具有高能量密度和高效率，适用于储能应用。尽管实验研究取得了重大进展，但对与结构相关的特性的了解仍不全面。本研究旨在研究高熵 (Na0.2Bi0.2Ca0.2Sr0.2Ba0.2)TiO3 (NBCSB) 材料在不同尺度下的结构、电气和机械性能。第一原理计算的结果表明，与层间畸变相比，伪层内畸变明显较小。在各种键中，Bi-O、Ca-O 和 Na-O 的位移最大。同样，O 2p 和 Ti 3d 态与 Bi 6p 态之间的杂化也特别强，对铁电极化和弛豫行为都有影响。采用典型固态工艺生产的 NBCSB 材料在储能方面表现出卓越的性能，在 120 kV-cm-1 的小电场下，其可恢复密度为 1.53 J-cm-3，效率高达 89%。此外，这些陶瓷的硬度高达 7.23 GPa。NBCSB 陶瓷表现出卓越的弛豫特性，具有最小的滞后和较低的剩电位极化，这是因为其纳米级高动态极化配置具有多种对称性（斜方体、四方体和立方体），这些对称性来自随机分散的 A 位离子。优异的力学性能与位错阻塞效应、固溶强化效应和畴界效应有关。本研究的发现为 A 位无序高熵弛豫铁电陶瓷提供了一个全面而新颖的视角。
Structural origin of enhanced storage energy performance and robust mechanical property in A-site disordered high-entropy ceramics
Abstract
High-entropy perovskite ferroelectric materials have attracted significant attention due to their remarkably low remnant polarizations and narrow hysteresis. Thus, these materials offer high-energy density and efficiency, making them suitable for energy storage applications. Despite significant advancements in experimental research, understanding of the properties associated with structure remains incomplete. This study aims to study the structural, electric, and mechanical performances at various scales of the high-entropy (Na0.2Bi0.2Ca0.2Sr0.2Ba0.2)TiO3 (NBCSB) material. The results of first-principles calculations indicated that the pseudo-intralayer distortion was obviously smaller compared to the interlayer distortion. Among the various bonds, Bi–O, Ca–O, and Na–O experienced the greatest displacement. Similarly, the hybridization between O 2p and Ti 3d states with Bi 6p states was particularly strong, affecting both the ferroelectric polarization and relaxor behavior. The NBCSB materials produced using a typical solid-state process demonstrated exceptional performance in energy storage with a recoverable density of 1.53 J·cm−3 and a high efficiency of 89% when subjected to a small electric field of 120 kV·cm−1. In addition, these ceramics displayed a remarkable hardness of around 7.23 GPa. NBCSB ceramics exhibited exceptional relaxation characteristics with minimal hysteresis and low remanent polarization due to its nanoscale high dynamic polarization configuration with diverse symmetries (rhombohedral, tetragonal, and cubic) resulting from randomly dispersed A-site ions. The excellent mechanical property is related to the dislocation-blocking effect, solid solution strengthening effect, and domain boundary effect. The findings of this study offer a comprehensive and novel perspective on A-site disordered high-entropy relaxor ferroelectric ceramics.
期刊介绍：
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.
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