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氧化铈表面的结构与性能对氧化铈材料的许多实际应用有着重要的影响,因此受到了广泛的关注和研究.由于大多数的表面技术仅限于获得表面最外层原子的结构信息,对材料亚表面的结构信息还非常匮乏.我们基于像差校正高分辨透射电子显微技术,同时获得了氧化铈(100)表面和亚表面的结构信息,从而揭示了氧化铈(100)表面的一种亚稳态.在这种新结构中,表面最外层和次外层原子面发生了反转,使得具有Ce终结的化学计量比的表面以O原子面暴露在最外层.伴随这种原子面反转,为了补偿表面极性的电荷重排也不同于正常的(100)表面.
The structure and properties of cerium oxide surface have important influence on many practical applications of cerium oxide material, and have received extensive attention and research.Because most of the surface technology is limited to obtain the structural information of the outermost surface atoms of the material, The surface structure of the information is still very scarce.We based on aberration correction high resolution transmission electron microscopy, while the cerium (100) surface and subsurface structure information, revealing a ceria (100) surface of a sub In this new structure, the outermost and the outer subatomic planes of the surface are reversed such that the Ce-terminated stoichiometric surface is exposed as the O-atomic plane to the outermost layer, Inverted, the charge rearrangement to compensate for surface polarity is also different from the normal (100) surface.