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Title: Influence of step morphology on the structural phase transition of the α-Al{sub 2}O{sub 3}(0001) surface

The structural phase transition from the 1 × 1 to the √31 × √31 ± R9° structure of two types of α-Al{sub 2}O{sub 3}(0001) surfaces has been investigated using reflection high-energy electron diffraction. One of the α-Al{sub 2}O{sub 3}(0001) surfaces was composed of regularly arranged monolayer steps (M-surface), and the other surface was composed of multiples of bilayer high steps (B-surface). The surface transition from the 1 × 1 to the √31 × √31 ± R9° structure starts at 1200 °C on the M-surface, but the transition occurs at 1600 °C on the B-surface. We discuss the difference in the stability of these surfaces at high temperature from the viewpoint of the stoichiometry near the step edge and conclude that the B-surface is more stable than the M-surface.
Authors:
; ; ;  [1] ;  [2]
  1. Nanosystem Science, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027 (Japan)
  2. Namiki Precision Jewel Co., Ltd., 3-8-22 Shinden, Adachi-ku, Tokyo 123-8511 (Japan)
Publication Date:
OSTI Identifier:
22300075
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM OXIDES; CRYSTAL STRUCTURE; ELECTRON DIFFRACTION; LAYERS; PHASE TRANSFORMATIONS; REFLECTION; STABILITY; STOICHIOMETRY; SURFACES; TEMPERATURE RANGE 1000-4000 K