sr0.6 ba0.4 nb2o6基钨青铜铁电体的高电容性能

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-10-06 DOI:10.1063/5.0294922

Jian Guo, Qixun Wen, Yanjiong Zhang, Jiapeng Sun, Shengdi Ta, Haoran Yu, Liang Cao, Ji Zhang, Shan-Tao Zhang

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引用次数: 0

摘要

介质电容器因其超高的功率密度和快速的充放电速度而受到越来越多的关注。本文将钙钛矿Sr0.6Ba0.4TiO3 （SBT）引入到钨青铜Sr0.6Ba0.4Nb2O6 （SBN）中，保持相同的Sr/Ba比，以提高无Bi/Na/ pb(1−x)SBN- xsbt铁电体的储能性能。当x≤0.3增大时，试样形成固溶体，对应于未填充-填充钨青铜结构转变，晶粒各向异性和平均晶粒尺寸显著降低。然而，钙钛矿第二相逐渐出现，当x &；gt；0.3. 在x = 0.4附近，这种相和组织的演化导致松弛度γ和击穿强度Eb单调增强。结果表明，该组合物具有较高的可回收储能密度（Wrec = 9.5 J/cm3）和储能效率（η = 82.1%），在20 ~ 150℃范围内，两者的变化均小于7%。令人鼓舞的是，获得了优异的充放电性能，t0.9 = 23 ns, WD = 6.2 J/cm3。这项工作为通过相和微观结构设计开发高能量存储性能的氧化钨青铜提供了见解。

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High capacitance behavior in Sr0.6Ba0.4Nb2O6-based tungsten bronze ferroelectrics

Dielectric capacitors with superior energy storage performance are attracting growing attention due to ultrahigh power density and rapid charge/discharge speed. In this work, perovskite Sr0.6Ba0.4TiO3 (SBT) is introduced into tungsten bronze Sr0.6Ba0.4Nb2O6 (SBN), maintaining an identical Sr/Ba ratio, to enhance the energy storage performance of Bi/Na/Pb-free (1 − x)SBN-xSBT ferroelectrics. The sample with increasing x ≤ 0.3 forms a solid solution corresponding to the unfilled–filled tungsten bronze structure transition, accompanied by dramatically decreased grain anisotropy and average grain size. However, the perovskite second phase gradually appears, and the average grain size further decreases slightly when x > 0.3. Such phase and microstructure evolution induces monotonously enhanced relaxor degree γ and breakdown strength Eb around x = 0.4. As a result, this optimal composition shows high recoverable energy storage density Wrec = 9.5 J/cm3, energy storage efficiency η = 82.1%, both of which vary less than 7% within 20–150 °C. Encouragingly, excellent charge–discharge performances, t0.9 = 23 ns and WD = 6.2 J/cm3, are obtained. This work provides insights into developing high energy storage performance tungsten bronze oxide through phase and microstructure design.

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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.