Equilibrium faceting formation in vicinal Al2O3 (0001) surface caused by annealing

SURFACE SCIENCE

卷:606

Article

Verre, R.¹ 

[1] Trinity Coll Dublin, CRANN, Dublin 2, Ireland

关键词: Sapphire;    Faceting;    High temperature annealing;    Equilibrium state;   

DOI  :  10.1016/j.susc.2012.07.024

来源: Elsevier

【 摘 要 】

We report on a heat-induced transformation of the surface of a-alumina (0001) crystals which have an off-cut in the [1 (2) over bar 10] direction. Annealing the crystal causes the surface to transform into a regular array of (0001) and (1 (2) over bar 16) facets. The resultant faceted morphology represents the equilibrium state of the system. It is demonstrated that the average terrace periodicity is determined by the annealing temperature. Possible causes for the surface rearrangement are also discussed. This method could be used for producing templates with controlled periodicity for growth of nanostructure arrays. Published by Elsevier B.V.

【 授权许可】

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