准晶锑薄膜

IF 2.3 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Israel Journal of Chemistry Pub Date : 2023-11-30 DOI:10.1002/ijch.202300135

Hem Raj Sharma, Peter John Nugent, Sam Coates, Ronan McGrath

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引用次数: 0

摘要

热稳定二元二十面体(i) Cd−Yb1准晶体的发现开辟了非周期材料研究的新领域。与其他主要由三种元素组成并以Al为基础的普通准晶体不同，i-Cd−Yb准晶体仅由两种元素组成，从而可以进行完整的结构测定这种材料是由毗邻胶原子的菱形三面体(RTH)团簇组成的非周期阵列构成的，这使得它的结构与al基准晶体不同，后者的构建块是Mackay和Bergman团簇。3然而，由于Cd的蒸气压很高，Cd−Yb不适合在超高真空(UHV)条件下进行表面研究。通过用Ag和In取代Cd，可以在具有高结构质量的大单晶粒中生长同结构的Ag−In−Yb准晶体，4使该相的特高压表面研究成为可能。5-9研究表明，在与RTH团簇中心相交的体面上形成了i-Ag−In−Yb的所有三个高对称面。5,8,9对具有比体准晶体更少化学复杂性的非周期结构的研究导致了新的外延结构的发现。10,11这些结构包括具有五重孪晶结构的贵金属薄膜、受量子尺寸效应影响的10魔高Bi和Ag薄膜、12-14和准周期调制多层Cu结构。15-17此外，还发现衬底的准晶结构可以传递到单一元素的薄膜上。准晶结构不仅限于单层，而且可以延伸到薄膜的几个原子层。在各种al基准晶体上观察到Bi、18、19 Sb、18 Sn、20和Pb21、22的准晶单层。Pb沉积在i-Ag−in−Yb上，Sn沉积在i-Al−Pd−Mn24上，Na沉积在i-Al−Pd−Mn.25上，形成多层准晶结构有理论预测在i-Al - Pd - Mn 26上有一层稀疏的碱金属的准晶双层结构，但这种结构尚未在实验中实现。本文用扫描隧道显微镜(STM)和x射线光电子能谱(XPS)研究了Sb薄膜在五重i-Ag−In−Yb表面的生长。选择锑来研究在i-Ag−In−Yb上伪晶生长的可能性，原因如下:Sb与Sn具有相似的原子尺寸，并且与Bi处于相同的周期族，具有相似的电子构型，并且之前这三个元素Sn, 20bi,18, 19和Sb18在al基准晶体上成功地生长在准晶单层中。另一种元素Pb，在元素周期表中紧邻Bi，与Sn在同一列，也在al基准晶体21,22上形成准晶单层，在i-Ag−in−Yb.23上形成准晶多层这四种元素的表面自由能都很低。选择Sb的另一个动机是考虑到Sb与衬底In之间的共价键可能在衬底中诱导准晶结构。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Quasicrystalline Antimony Thin Films

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Quasicrystalline Antimony Thin Films

The growth of antimony (Sb) thin films on the fivefold surface of icosahedral Ag−In−Yb quasicrystal has been studied by scanning tunneling microscopy (STM) and x-ray photoelectron spectroscopy (XPS). At low coverage, the deposited Sb yields a network of pentagons of different sizes and heights. These Sb pentagons can be mapped by a pentagonal tiling of the substrate and thus exhibit quasicrystalline long-range order. Subsequent deposition of Sb yields a disordered film. XPS observations of the growth mode are consistent with the STM results.

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来源期刊

Israel Journal of Chemistry 化学-化学综合

CiteScore

6.20

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The fledgling State of Israel began to publish its scientific activity in 1951 under the general heading of Bulletin of the Research Council of Israel, which quickly split into sections to accommodate various fields in the growing academic community. In 1963, the Bulletin ceased publication and independent journals were born, with Section A becoming the new Israel Journal of Chemistry. The Israel Journal of Chemistry is the official journal of the Israel Chemical Society. Effective from Volume 50 (2010) it is published by Wiley-VCH. The Israel Journal of Chemistry is an international and peer-reviewed publication forum for Special Issues on timely research topics in all fields of chemistry: from biochemistry through organic and inorganic chemistry to polymer, physical and theoretical chemistry, including all interdisciplinary topics. Each topical issue is edited by one or several Guest Editors and primarily contains invited Review articles. Communications and Full Papers may be published occasionally, if they fit with the quality standards of the journal. The publication language is English and the journal is published twelve times a year.