Atomically ordered Al2O3 obtained by thermal oxidation of the Ni3Al(001) surface was studied using scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED). LEED analysis has shown that oxidation at 800 and 1100 K forms two different structural phases of Al2O3. Detailed STM studies of both phases also reveal remarkable differences in surface pattern structure and arrangement of the domains. We have shown that well-ordered Al2O3 layers are, in principle, full of dislocations. However, the dislocations, which are responsible for surface superstructures, are well ordered, forming either stripes in the low-temperature phase, or patches in the high-temperature phase. Interacting with the single-crystalline substrate, the nanopatches form their own lattice of superarrangement, introducing linelike or more complex superdislocations.
|Title of host publication||Proceedings of the 13th International Conference on Scanning Tunneling Microscopy/Spectroscopy and Related Techniques, 3-8 July 2005, Sapporo, Japan|
|Publication status||Published - 2005|
|Name||Japanese Journal of Applied Physics, Part 1 : Regular Papers and Short Notes & Review Papers|