Formation of stable, two-dimensional alloy-surface phases: Sn on Cu(111), Ni(111), and Pt(111).
Formation of stable, two-dimensional alloy-surface phases: Sn on Cu(111), Ni(111), and Pt(111).
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形成稳定的二维合金表面相：Cu(111)、Ni(111) 和 Pt(111) 上的 Sn。
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
Ku
中科院分区：
文献类型：
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作者：
Overbury;Ku
总结了在Cu（111）、Ni（111）和Pt（111）上沉积和退火Sn的氧化层后获得的表面结构的离子散射分析结果。结果发现，在每个衬底上，退火到衬底熔化温度的0.4左右，产生了一个稳定的结构，其特征在于p（\ensuremath{\surd} 3）-R30\ifmmode\times\else\texttimes\fi {} \ensuremath{\surd}3）-R30\ifmmode\circ\else\textdegree\fi {}低能电子衍射图案和1/3单层覆盖。表面是等结构的，对应于单层厚度的波纹表面合金。所测得的波纹，其中Sn原子从相邻的衬底原子向外突出，被发现是线性相关的衬底晶格常数表明，波纹提供横向应变救济层内。根据离子散射结果和表面合金的理论研究，讨论了深度分布、热稳定性、p（\ensuremath{\surd}3 \ifmmode\times\else\texttimes\fi{} \ensuremath{\surd}3）-R30\ifmmode\\circ\else\textdegree\fi {}有序的优先形成以及测量到的波纹等问题.
Results are summarized of ion-scattering analysis of the surface structure obtained following deposition and annealing of ultrathin layers of Sn on Cu(111), Ni(111), and Pt(111). It is found that on each substrate, annealing to about 0.4 of the substrate melting temperature gives rise to a stable structure characterized by a p(\ensuremath{\surd}3\ifmmode\times\else\texttimes\fi{} \ensuremath{\surd}3)-R30\ifmmode^\circ\else\textdegree\fi{} low-energy electron diffraction pattern and 1/3 monolayer coverage. The surfaces are isostructural and correspond to rippled surface alloy which is a single layer thick. The measured rippling, in which Sn atoms protrude outward from neighboring substrate atoms, is found to be linearly related to the substrate lattice constant suggesting that rippling provides lateral strain relief within the layer. Issues of the depth distribution, the thermal stability, the preferential formation of the p(\ensuremath{\surd}3 \ifmmode\times\else\texttimes\fi{} \ensuremath{\surd}3 )-R30\ifmmode^\circ\else\textdegree\fi{} ordering, and the measured rippling are discussed in light of the ion-scattering results and theoretical studies of surface alloys.