Structural determination of a NiO(111) film on Ni(100) by dynamical low‐energy electron‐diffraction analysis
Structural determination of a NiO(111) film on Ni(100) by dynamical low‐energy electron‐diffraction analysis
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通过动态低能电子衍射分析确定 Ni(100) 上 NiO(111) 薄膜的结构
DOI：
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发表时间：
1994
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通讯作者：
P. Thiel
中科院分区：
文献类型：
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作者：
O. Warren;P. Thiel
通过动态低能电子衍射分析确定了Ni（100）上NiO（111）膜的几何结构。氧化膜足够厚且均匀，以在体晶极限下进行分析。NiO（111）存在四个取向畴。我们考虑了氧化膜的四种可能的终端（氧或镍，fcc或hcp位置）。我们的研究结果表明，氧化膜终止于最顶层的氧在fcc网站，并表现出14.8%的收缩，在第一层间距相对于“散装”的层间距的膜。氧化膜的“体"晶格参数相对于体NiO（111）均匀压缩了2.6%。与其他工作的比较表明，氧终止，在第一层间距的强烈收缩，并在更深的层立方对称性的保留可能是金属氧化物膜的未重构岩盐（111）表面的一般特征。
The geometric structure of a NiO(111) film on Ni(100) has been determined by dynamical low‐energy electron‐diffraction analysis. The oxide film is sufficiently thick and uniform to carry out the analysis in the bulk crystal limit. Four orientational domains of NiO(111) are present. We consider four possible terminations of the oxide film (oxygen or nickel, fcc or hcp sites). Our results indicate that the oxide film terminates with a topmost layer of oxygen in fcc sites, and exhibits a 14.8% contraction in the first interlayer spacing relative to the ‘‘bulk’’ interlayer spacing of the film. The ‘‘bulk’’ lattice parameters of the oxide film are found to be uniformly compressed by 2.6% relative to bulk NiO(111). Comparison with other work suggests that oxygen termination, a strong contraction in the first interlayer spacing, and retention of cubic symmetry in deeper layers may be general characteristics of unreconstructed rocksalt(111) surfaces of metal oxide films.