Lead adsorption on the Al13Co4(100) surface: heterogeneous nucleation and pseudomorphic growth
Lead adsorption on the Al13Co4(100) surface: heterogeneous nucleation and pseudomorphic growth
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Al13Co4(100)表面上的铅吸附：异相成核和假晶生长
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
J. Ledieu
中科院分区：
文献类型：
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作者：
R. Addou;A. K. Shukla;S. A. Villaseca;É. Gaudry;T. Deniozou;M. Heggen;M. Feuerbacher;R. Widmer;O. Gröning;V. Fournée;J. Dubois;J. Ledieu
研究了Pb原子在300和573 K衬底温度下在正交晶系Al_（13）Co_4晶体（100）面上的吸附。这种复杂的金属合金近似于十次对称的Al-Ni-Co准晶。在亚单层覆盖和在300 K，铅吸附原子保持高度移动的和吸附优先在中空的网站位于相邻的Al五边形簇之间存在于表面。基于密度泛函理论（DFT）的从头计算支持这些实验结果。对于这两个温度制度，铅吸附导致形成的假单分子层以上的高吸附物的流动性，禁止额外的层的生长。对于高温沉积，我们提出了铅膜的结构模型，并讨论了它与下面的衬底的关系。
We have investigated the adsorption of Pb atoms on the (100) surface of an orthorhombic Al13Co4 crystal at 300 and 573 K substrate temperatures. This complex metallic alloy is an approximant to the decagonal Al–Ni–Co quasicrystal. At submonolayer coverage and at 300 K, Pb adatoms remain highly mobile and adsorb preferentially within the hollow site situated in between adjacent Al pentagonal clusters present at the surface. These experimental findings are supported by ab initio calculations based on density functional theory (DFT). For both temperature regimes, Pb adsorption leads to the formation of pseudomorphic monolayers above which the high adsorbate mobility prohibits the growth of additional layers. For the high-temperature deposition, we propose a structural model for the Pb film and discuss its relationship with the underneath substrate.