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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Growth and Alloyirsg of Ultra-Thin Zn Layers on Pd(110)
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Growth and Alloyirsg of Ultra-Thin Zn Layers on Pd(110)

机译：Pd（110）上超薄锌层的生长及合金化

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摘要

Growth, ailoying, and structure of ultra-thin layers of Zn deposited onto Pd(110) were investigated by low-energy ion scattering, low-energy electron diffraction, Auger electron spectroscopy, and temperature "programmed desorption. In the initial deposition stage at room temperature, intermixing between Zn and Pd occurs, leading to an alloyed interface layer, which, with increasing deposition time, is then overgrown by Zn adlayers with a rough surface morphology. At 3 ML, a transition takes place from pseudomorphic growth to bulk-like hep Zn(001) films. Upon annealing of the as-deposited films to temperatures above 450 K, Zn surface atoms start to migrate into subsurface layers, leading to the formation of a PdZn surface alloy with local 1:1 stoichiometry. The precise onset temperature for this process depends on the initial Zn coverage. The resulting !:1 surface alloy has a strongmonolayer character/ is pseudomorphic, and exhibits a small Pd-up/Zn-down buckling and a (2 x 1)periodicity with Pd and Zn atoms located alternatingly along the close-packed atomic rows. This structure can be regarded as descending from the (101) surface of the tetragonal bulk PdZn intermetallic phase.
机译：通过低能离子散射，低能电子衍射，俄歇电子能谱和“程序升温”程序解吸研究了沉积在Pd（110）上的Zn超薄层的生长，Aliloying和结构。在室温下，Zn和Pd之间发生混合，形成合金化的界面层，随着沉积时间的增加，表面层形态粗糙的Zn层会过度生长，在3 ML时，会发生从假晶生长到体相的转变。像七氧化锌（001）薄膜一样。将沉积后的薄膜退火到450 K以上的温度后，锌表面原子开始迁移到亚表层，从而形成具有局部1：1化学计量比的PdZn表面合金。此过程的起始温度取决于初始的Zn覆盖率。！：1表面合金具有很强的单层特性/是准晶态，并且表现出较小的Pd-up / Zn-down屈曲和（2 x 1）周期性y，其中Pd和Zn原子沿密集的原子行交替排列。可以认为该结构是从四方块状PdZn金属间相的（101）表面下降的。

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