通过原位化学作用实现双碲族的族内转化

IF 5.3 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
APL Materials Pub Date : 2024-09-05 DOI:10.1063/5.0223779
Zhihao He, Tin Seng Manfred Ho, Chen Ma, Jiannong Wang, Rolf Lortz, Iam Keong Sou
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引用次数: 0

摘要

以 (Bi2)m(Bi2Te3)n 同源系列为特征的 BiTe 二元体系,因其层状结构和在先进材料应用中的潜力,一直吸引着研究人员的兴趣。尽管对 Bi2Te3 进行了广泛的研究,但对其他化合物的探索一直受到合成难题的制约。本研究报告了在 Bi2Te3 上分子束外延生长 FeTe 的过程,证明了不同的生长条件可将 Bi2Te3 层转化为不同的 Bi-Te 相,并形成相应的 FeTe/Bi-Te 异质结构。我们利用反射高能电子衍射、高分辨率 X 射线衍射和高分辨率扫描透射电子显微镜进行的综合分析表明,用于生长 FeTe 层的特定生长条件可促进从 Bi2Te3 中提取 Te,从而形成 Bi4Te3 和 Bi6Te3。此外,将 FeTe 生长温度降低到 230 °C,可以避免从 Bi2Te3 层中萃取 Te,从而保留 Bi2Te3 结构。值得注意的是,所有三种 FeTe/Bi-Te 结构都表现出超导性,其中 FeTe/Bi2Te3 异质结构的超导质量最高。磁传输测量结果表明,诱导超导具有三维性质。这些发现介绍了一种新方法,即通过在 Bi2Te3 上生长 FeTe 来提取 Te,从而实现 Bi4Te3 和 Bi6Te3。这种方法有望合成 Bi-Te 系列的其他成员,从而拓展这些材料的功能潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Intra-family transformation of the Bi–Te family via in situ chemical interactions
The Bi–Te binary system, characterized by the homologous series of (Bi2)m(Bi2Te3)n, has always attracted research interest for its layered structures and potential in advanced material applications. Despite the fact that Bi2Te3 has been extensively studied, the exploration of other compounds has been constrained by synthesis challenges. This study reports the molecular beam epitaxy growth of FeTe on Bi2Te3, demonstrating that varying growth conditions can turn the Bi2Te3 layer into different Bi–Te phases and form corresponding FeTe/Bi–Te heterostructures. Our combined analysis using reflection high-energy electron diffraction, high-resolution x-ray diffraction, and high-resolution scanning transmission electron microscopy indicates that specific growth conditions used for the growth of the FeTe layer can facilitate the extraction of Te from Bi2Te3, leading to the formation of Bi4Te3 and Bi6Te3. In addition, by lowering the FeTe growth temperature to 230 °C, Te extraction from the Bi2Te3 layer could be avoided, preserving the Bi2Te3 structure. Notably, all three FeTe/Bi–Te structures exhibit superconductivity, with the FeTe/Bi2Te3 heterostructure enjoying the highest superconductivity quality. The results of magneto-transport measurements indicate that the induced superconductivity displays a three-dimensional nature. These findings introduce a novel method for realizing Bi4Te3 and Bi6Te3 through Te extraction by growing FeTe on Bi2Te3, driven by the high reactivity between Fe and Te. This approach holds promise for synthesizing other members of the Bi–Te series, expanding the functional potential of these materials.
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来源期刊
APL Materials
APL Materials NANOSCIENCE & NANOTECHNOLOGYMATERIALS SCIE-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
9.60
自引率
3.30%
发文量
199
审稿时长
2 months
期刊介绍: APL Materials features original, experimental research on significant topical issues within the field of materials science. In order to highlight research at the forefront of materials science, emphasis is given to the quality and timeliness of the work. The journal considers theory or calculation when the work is particularly timely and relevant to applications. In addition to regular articles, the journal also publishes Special Topics, which report on cutting-edge areas in materials science, such as Perovskite Solar Cells, 2D Materials, and Beyond Lithium Ion Batteries.
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