Impact of oxygen vacancy-gradient surface layer on the electrostrain of Sb3+ doped BNKST ceramics

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-05-21 DOI:10.1063/5.0271329

Jianhui Jia, Pengrong Ren, Kexuan Zhao

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引用次数: 0

Abstract

Recently, ultra-large electrostrain exceeding 1% has been observed in various thin ferroelectric ceramics, generating a significant research interest. However, the underlying mechanisms remain controversial. In this work, electrostrain, along with the dielectric and ferroelectric properties of {(K0.2Na0.8)0.5Bi0.5}0.96Sr0.04SbxTi1−xO3−x/2 ceramics, was investigated, and all of them feature a sample's thickness (t) dependence. As t decreased from 0.4 to 0.1 mm, both the permittivity (ε′) and loss tangent (tanδ) diminished, and the maximum polarization (Pmax) decreased, while the electrostrain (S) exhibited a significant increase. X-ray diffraction and x-ray photoelectron spectroscopy analyses revealed structural differences between the bulk and the surface of the ceramics, and surface reconstruction during the poling process. Based on these findings, we propose that the thickness-dependent electric properties are related to hopping oxygen vacancies, which forms an oxygen vacancy-gradient layer on the ceramic surface under the applied electric field. Our work is conducive to understanding the thickness-dependent properties recently discovered in piezoelectric ceramics.

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氧空位梯度面层对Sb3+掺杂BNKST陶瓷电应变的影响

近年来，在各种薄铁电陶瓷中发现了超过1%的超大电应变，引起了人们极大的研究兴趣。然而，潜在的机制仍然存在争议。在这项工作中，研究了{(K0.2Na0.8)0.5Bi0.5}0.96Sr0.04SbxTi1−xO3−x/2陶瓷的电应变，以及介电和铁电性质，并且它们都具有样品厚度(t)依赖性。当t从0.4 mm减小到0.1 mm时，电介电常数ε′和损耗正切值tanδ减小，最大极化值Pmax减小，电应变S显著增大。x射线衍射和x射线光电子能谱分析揭示了陶瓷本体和表面的结构差异，以及极化过程中的表面重构。基于这些发现，我们提出厚度依赖的电性质与跳跃氧空位有关，在外加电场作用下在陶瓷表面形成氧空位梯度层。我们的工作有助于理解最近在压电陶瓷中发现的厚度依赖特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.