la修饰CdCu3Ti4O12薄膜的光学、介电和非欧姆性质

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Renzhong Xue , Xiaosong Liu , Yuping Yang , Xiang Zhu , Tao Li
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引用次数: 0

摘要

CdCu3Ti4O12 (CdCTO)薄膜等具有双功能介电和压敏特性的二维(2D)材料在电子和能源系统的多功能集成中具有巨大的应用潜力。然而,降低CdCTO薄膜的介电损耗正切(tanδ)和增加击穿场强(Eb),同时保持其高介电常数(ε’)仍然是一个挑战。在这项工作中,通过溶胶-凝胶法掺杂La3+来改变CdCu3Ti4O12薄膜的光学,介电和非欧姆性质。在3.61 ~ 3.21 eV的光学带隙范围内,la掺杂薄膜表现为单相结构,抑制了晶粒的生长。掺杂薄膜的晶界电阻(GB)和势垒高度显著增加,从而对tanδ、Eb和非线性系数(α)产生积极影响。ε′参数遵循内阻挡层电容器(IBLC)模型,随着晶粒尺寸的增大而减小,但始终保持在较高的值。结果表明,Cd0.91La0.06Cu3Ti4O12薄膜具有极低的tanδ为~ 0.011,高的Eb为~ 82.1 kV/mm, ε′为~ 8890,α为~ 6.64。中频范围内的弛豫机制归因于与GBs相关的麦克斯韦-瓦格纳弛豫。因此,提出了制备同时具有优良介电性能和非欧姆性能的双功能薄膜的有效方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The optical, dielectric and non-Ohmic properties of La-modified CdCu3Ti4O12 thin films
Two-dimensional (2D) materials with dual-functional dielectric and varistor properties, such as CdCu3Ti4O12 (CdCTO) films, have great application potential in multi-functional integration of electronics and energy systems. However, reducing the dielectric loss tangent (tanδ) and increasing the breakdown field strength (Eb) of CdCTO films, while maintaining their high dielectric constant (ε′) is still a challenge. In this work, La3+ doping via a sol-gel method was implemented to modify the optical, dielectric and non-Ohmic properties of CdCu3Ti4O12 thin films. The La-doped thin films exhibited a single-phase structure and suppressed the grain growth at varying optical band gaps from 3.61 to 3.21 eV. The grain boundary (GB) resistance and the barrier height were increased significantly in the doped films, thereby exerting positive effects on tanδ, Eb and nonlinear coefficient (α). The ε′ parameter followed the internal barrier layer capacitor (IBLC) model, decreasing with the grain size, but remained at a relatively high value. As a result, an extremely low tanδ of ∼ 0.011 and high Eb of ∼ 82.1 kV/mm along with ε′ of ∼ 8890 and α of ∼ 6.64 were obtained in Cd0.91La0.06Cu3Ti4O12 film. The relaxation mechanism in the medium frequency range was ascribed to a Maxwell–Wagner relaxation related to GBs. Therefore, effective methods were proposed to obtain double-functional films that possess excellent dielectric and non-Ohmic properties simultaneously.
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来源期刊
Journal of Alloys and Compounds
Journal of Alloys and Compounds 工程技术-材料科学:综合
CiteScore
11.10
自引率
14.50%
发文量
5146
审稿时长
67 days
期刊介绍: The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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