a combined STM and LEED study of FeO(111) on Pt(100).
a combined STM and LEED study of FeO(111) on Pt(100).
复制标题
FeO(111) 与 Pt(100) 的结合 STM 和 LEED 研究。
DOI：
--
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
W. Weiss
中科院分区：
文献类型：
--
作者：
S. Shaikhutdinov;M. Ritter;W. Weiss
用扫描隧道显微镜（STM）和低能电子衍射（LEED）研究了在Pt（100）-hex衬底上外延氧化铁单层膜的形成。高分辨率STM图像揭示了原始Pt（100）-hex衬底的顶部原子行沿着[011]方向的正弦高度调制。这种调制被分配到由于与Pt衬底原子的相互作用的顶部氧层的屈曲。表面上同时存在两种超结构：FeO（111）/Pt（100）-c（2x 10）和（2x 9）重合结构。后一种结构的结果在一个更低的Pendry R-因子在动态LEED分析比以前报道的c（2x 10）结构。许多岛屿，具有相同的表面结构的阶地，发展上的密集的FeO覆盖层。它们归属于在FeO（111）双层下面的Pt衬底的（hex）→（1x 1）重构过程中形成的Pt（100）-（1x 1）岛。这些岛是矩形的，并在原始Pt（100）上的六边形重建方向上伸长。结合STM和LEED数据清楚地表明，各向异性在衬底重建导致各向异性的氧化物覆盖层。
Formation of the epitaxial iron oxide monolayer on the Pt(100)-hex substrate was studied by scanning tunneling microscopy (STM) and low energy electron diffraction (LEED). High resolution STM images reveal a sinusoidal height modulation of the top atomic rows along the [011] direction of the original Pt(100)-hex substrate. This modulation is assigned to the buckling of the top oxygen layer due to the interaction with Pt substrate atoms. Two superstructures described as FeO(111)/Pt(100)-c(2x10) and (2x9) coincidence structure coexist on the surface. The latter structure results in a much lower Pendry R-factor in dynamical LEED analysis than earlier reported for a c(2x10) structure. Numerous islands, having the same surface structure as the terraces, develop on the dense FeO overlayer. They are assigned to the Pt(100)-(1x1) islands formed during (hex)→(1x1) reconstruction of the Pt substrate underneath the FeO(111) bilayer. The islands are rectangular and elongated in the direction of hex-reconstruction on the original Pt(100). Combined STM and LEED data clearly indicate that anisotropy in the substrate reconstruction leads to anisotropy of the oxide overlayer.