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Growth and dissolution kinetics of Au/Pb(1 1 1): an AES-LEED study

机译：Au / Pb（1 1 1）的生长和溶解动力学：AES-LEED研究

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摘要

The growth of Au on a Pb(l 1 1) surface is studied by AES-LEED at room temperature (RT). After deposition of 1/3 Au monolayer (ML), LEED observations reveal a p(3~(1/2) x 3~(1/2))R30° superstructure. Beyond this coverage, no superstructure is observed. From Au and Pb Auger peak intensities, we deduce that the growth corresponds to the formation of an inter-metallic compound Au_xPb_y continuously growing under a floating Pb ML. The dissolution kinetics of one Au ML recorded at various temperatures systematically show a plateau (a slowing down) at a surface concentration corresponding to 1/3 ML. From a quantitative evaluation of the AES data we propose that the p(3~(1/2) x 3~(1/2))R30°superstructure corresponds to a surface alloy with composition AuPb_2 buried under 1 Pb ML. Such a surface alloy has been previously measured after annealing of a Au(Pb) 0.45 at.% solid solution [Surf. Rev. Lett. 4 (1997) 1139], we propose that the slowing down observed during the dissolution kinetics is also the signature of this unexpected segregation behaviour of Au. It could be related to the fact that the surface energy of this inter-metallic compound (AuPb_2) is lower than the surface energy of both constitutive elements (Au and Pb).
机译：在室温（RT）下通过AES-LEED研究了Au在Pb（l 1 1）表面上的生长。在沉积了1/3 Au单层膜（ML）之后，LEED观测结果显示p（3〜（1/2）x 3〜（1/2））R30°超结构。超出此范围，未观察到上层建筑。从Au和Pb Auger峰强度可以推断，该增长对应于在浮动Pb ML下连续生长的金属间化合物Au_xPb_y的形成。在各种温度下记录的一种Au ML的溶解动力学系统地显示出在对应于1/3 ML的表面浓度下出现了平稳期（下降）。通过对AES数据的定量评估，我们认为p（3〜（1/2）x 3〜（1/2））R30°上层结构对应于埋在1 Pb ML下具有AuPb_2组成的表面合金。在对Au（Pb）0.45 at。％的固溶体[Surf。Chem。牧师4（1997）1139]，我们认为在溶解动力学过程中观察到的减慢速度也是Au出乎意料的偏析行为的特征。这可能与以下事实有关：该金属间化合物（AuPb_2）的表面能低于两个组成元素（Au和Pb）的表面能。

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