Author/Authors :
Verre، نويسنده , , R. and Sofin، نويسنده , , R.G.S. and Usov، نويسنده , , V. and Fleischer، نويسنده , , K. and Fox، نويسنده , , D. and Behan، نويسنده , , G. and Zhang، نويسنده , , H. and Shvets، نويسنده , , I.V.، نويسنده ,
Abstract :
We report on a heat-induced transformation of the surface of α-alumina (0001) crystals which have an off-cut in the [1 2 ¯ 10] direction. Annealing the crystal causes the surface to transform into a regular array of (0001) and (1 2 ¯ 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.
Keywords :
equilibrium state , Faceting , High temperature annealing , Sapphire
