Local structural origin of relaxor antiferroelectric behavior in NaNbO3-based ceramics

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2025-04-27 DOI:10.1016/j.cej.2025.163109

Xiangyu Meng, Liran Yuan, Dongxu Li, Pengbing Wang, Qinghu Guo, Xiaoyan Gan, Zhonghua Yao, Hanxing Liu, Jinsong Wu, Shujun Zhang, Hua Hao

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Abstract

Relaxor-antiferroelectrics (relaxor-AFEs), known for their double polarization–electric field (P-E) hysteresis loops and relaxor characteristics, exhibit outstanding energy storage performance compared to other dielectric materials. However, the origins of their antiferroelectric-like behavior and relaxor features remain unclear due to their complex local structure. In this study, we designed relaxor-AFEs with a high degree of relaxor component and stable antiferroelectric behavior. The recoverable energy density (W_rec) of up to 4.6J/cm³ and energy efficiency of ∼ 79 % were achieved in a 0.76NaNbO₃-0.16Na_0.5Bi_0.5TiO₃-0.08CaTiO₃ ceramic, demonstrating excellent thermal and frequency stability. The multiphase local polarization configuration was confirmed by atomic-resolution annular dark-field scanning transmission electron microscopy (ADF STEM). Additionally, integrated differential phase contrast (iDPC) images revealed an enhanced antiferrodistortion (AFD) induced by incorporating component with low tolerance factor, contributing to stable antiferroelectric behavior. The relationship between chemical heterogeneity, polarization configuration and energy storage performance was systematically established. This work provides insights into the structure origin and underlying mechanisms for relaxor-AFE performance, with potential implications to guide the development of advanced energy-storage dielectric materials.

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纳米bo3基陶瓷弛豫反铁电行为的局部结构起源

弛豫-反铁电体（relaxor- afes）以其双极化电场（P-E）滞回线和弛豫特性而闻名，与其他介电材料相比，具有出色的储能性能。然而，由于其复杂的局部结构，其反铁电行为和弛豫特征的起源尚不清楚。在这项研究中，我们设计了具有高度弛豫成分和稳定反铁电行为的弛豫- afes。在0.76NaNbO3-0.16Na0.5Bi0.5TiO3-0.08CaTiO3陶瓷中实现了高达4.6J/cm3的可回收能量密度（Wrec）和 ~ 79 %的能量效率，表现出优异的热稳定性和频率稳定性。通过原子分辨率环形暗场扫描透射电镜（ADF STEM）证实了多相局域极化构型。此外，集成差分相衬（iDPC）图像显示，加入低容差因子的成分增强了反铁畸变（AFD），有助于稳定的反铁电行为。系统地建立了化学非均质性、极化构型与储能性能之间的关系。这项工作为弛豫- afe性能的结构起源和潜在机制提供了见解，对指导先进储能介质材料的开发具有潜在的意义。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.