Behavior of the (0 0 0 1) surface of sapphire upon high-temperature annealing |
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Authors: | Primo? Rebernik Ribi? |
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Affiliation: | Laboratory for Epitaxy and Nanostructures, Nova Gorica Polytechnic, Vipavska 13, SI-5001, Nova Gorica, Slovenia |
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Abstract: | Evolution of the (0 0 0 1) α-Al2O3 surface morphology upon annealing was studied using atomic force microscopy. The annealing protocol included temperatures of 1200 and 1500 °C and different time. Vicinal Al2O3 (0 0 0 1) surfaces annealed at 1200 °C exhibit initial localized step coalescence that evolves into terrace-and-step with island morphology that persists for several hours. Annealing at 1500 °C results in initial step coalescence on a global scale, and yields a terrace-and-step morphology with an indication of step bunching after longer annealing times. |
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Keywords: | Atomic force microscopy Step formation and bunching Surface structure Morphology Roughness Topography Aluminum oxide |
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