Large electrocaloric effect by disorder regulated structure in BaTiO3-based system

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-11-04 DOI:10.1063/5.0227301

Lei Xie, Gaochao Zhao, Jinquan Dou, Ruidong Yue, Min Zhang, Peng Tong, Jie Yang, Wenhai Song, Li-Hua Yin, Yuping Sun

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引用次数: 0

Abstract

We report the effects of B-site cationic size disorder (σ2) and configurational entropy (CE) on the crystal structure and electrocaloric (EC) effect of BaTi1−x−ySnxZryO3 (BTSZ) (0.01 ≤ x ≤ 0.06) ceramics. The samples were designed to show decreased σ2 and increased CE but the same B-site cation average radius and tolerance factor with increasing x. The tetragonal lattice distortion c/a and piezoelectricity showed a minimum and maximum, respectively, near x = 0.04. The ferroelectric Curie temperature decreased overall from ∼358 to ∼332 K with x increasing from 0.01 to 0.06. The EC effects measured by the direct method showed a maximum with an adiabatic temperature change of ∼0.80 K at 60 kV/cm near x = 0.04. The large EC effect in x = 0.04 is attributed to the small tetragonal distortion and low energy barrier for E-induced phase transformation due to the combined disorder effects of cationic size and configuration. Our results suggest a close correlation between the lattice distortion and EC effects and an effective route to improve the EC effects.

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基于 BaTiO3 的体系中的无序调控结构产生的巨大电致发光效应

我们报告了 B 位阳离子尺寸无序（σ2）和构型熵（CE）对 BaTi1-x-ySnxZryO3 (BTSZ) (0.01 ≤ x ≤ 0.06) 陶瓷晶体结构和电致发光（EC）效应的影响。设计的样品随着 x 的增大，σ2 会减小，CE 会增大，但 B 位阳离子平均半径和公差因子不变。四方晶格畸变 c/a 和压电性在 x = 0.04 附近分别显示出最小值和最大值。随着 x 值从 0.01 增加到 0.06，铁电居里温度总体上从∼358 K 下降到∼332 K。在 x = 0.04 附近，60 kV/cm 时的绝热温度变化为 ∼0.80 K。在 x = 0.04 时的 EC 效应较大，这是因为在阳离子尺寸和构型的综合无序效应下，四方畸变较小，E 诱导相变的能垒较低。我们的研究结果表明了晶格畸变与导电率效应之间的密切联系，以及改善导电率效应的有效途径。

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.