Origin of zero thermal expansion in an average cubic structure in Pb-free relaxor ferroelectrics

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2024-09-03 DOI:10.1063/5.0219631

Anuvrat Tripathi, Abhishek Pandey, Jose Antonio Alonso, Rudolph Erasmus, Maria Teresa Fernandez-Diaz, Saurabh Tripathi

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Abstract

This study presents “K0.5Na0.5NbO3-based” Pb-free smart material 0.80(K0.5Na0.5NbO3)–0.20(Ba0.9Sr0.1TiO3) (KBST20) as exhibiting zero thermal expansion (ZTE) at low temperatures (T≤ 100 K) with long-range cubic symmetry stable over a wide temperature range (9 K ≤T≤ 500 K). The linear coefficient of the thermal expansion (αl) obtained from temperature-dependent neutron diffraction data is in the range of 0.255–5.75 × 10−6 K–1 (9–500 K), which is rarely observed for Pb-free materials possessing long-range cubic symmetry. The temperature-dependent dielectric data of KBST20 exhibits a strong relaxational behavior with high frequency dispersion (ΔT≈ 27 K), suggesting the presence of polar phased regions known as polar nano regions. The ZTE has been attributed to enhanced correlations among PNRs exhibiting ferroelectrostriction. Furthermore, temperature-dependent Raman scattering data reveal polar monoclinic distortion at short ranges rather than cubic symmetry at long ranges. In addition, the intensity of Raman modes increases with the decrease in temperature, suggesting enhancement of the polar phase at low temperatures, which consequently leads to zero thermal expansion in KBST20.

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无铅弛豫铁电体中平均立方结构的零热膨胀起源

本研究提出了 "基于 K0.5Na0.5NbO3 的 "无铅智能材料 0.80(K0.5Na0.5NbO3)-0.20(Ba0.9Sr0.1TiO3)（KBST20），该材料在低温（T≤ 100 K）下表现出零热膨胀（ZTE），在宽温度范围（9 K ≤T≤ 500 K）内具有稳定的长程立方对称性。从与温度相关的中子衍射数据中得到的线性热膨胀系数（αl）范围为 0.255-5.75 × 10-6 K-1 （9-500 K），这在具有长程立方对称性的无铅材料中是很少见的。KBST20 随温度变化的介电数据表现出强烈的弛豫行为，具有高频色散（ΔT≈ 27 K），表明存在极性相区，即极性纳米区。ZTE 被归因于表现出铁电致伸缩的 PNR 之间相关性的增强。此外，随温度变化的拉曼散射数据显示，在短距离内存在极性单斜变形，而在长距离内则不存在立方对称。此外，拉曼模式的强度随着温度的降低而增加，表明极性相在低温下增强，从而导致 KBST20 的热膨胀为零。

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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.