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Long-Range Atomic Order on Double-Stepped Al2O3(0001) Surfaces.
Smink, Sander; Majer, Lena N; Boschker, Hans; Mannhart, Jochen; Braun, Wolfgang.
Afiliación
  • Smink S; Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569, Stuttgart, Germany.
  • Majer LN; MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, Enschede, 7500 AE, The Netherlands.
  • Boschker H; Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569, Stuttgart, Germany.
  • Mannhart J; epiray GmbH, Heisenbergstraße 1, 70569, Stuttgart, Germany.
  • Braun W; Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569, Stuttgart, Germany.
Adv Mater ; 36(24): e2312899, 2024 Jun.
Article en En | MEDLINE | ID: mdl-38457527
ABSTRACT
The deterministic preparation of highly ordered single-crystalline surfaces is a key step for studying and utilizing the physical properties of various advanced materials. This paper presents the fast and straightforward preparation of vicinal Al2O3(0001) surfaces with micrometer-scale atomic order. Crisp electron-diffraction spots up to at least 20th order evidence atomic coherence on terraces with widths exceeding 1 µm. The unique combination of three properties of Al2O3(0001) underlie this remarkable coherence its high-temperature stability; the differences in the ionic bonding systems of the surface as compared to the bulk; and the fact that the terraces are non-polar whereas the step edges have a polar character. The step edges are furthermore found to have alternating configurations, which drive a step-doubling transition. On double-stepped surfaces, the Al-rich ( 31 × 31 ) R ± 9 $(\sqrt {31}\times \sqrt {31})\textrm {R}\pm 9$ ° surface reconstruction attains a singular in-plane orientation. These results set a benchmark for high-quality surface preparation and thus expand the scope for both fundamental studies on and the technological utilization of exciting material systems.
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Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Adv Mater Asunto de la revista: BIOFISICA / QUIMICA Año: 2024 Tipo del documento: Article País de afiliación: Alemania

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Adv Mater Asunto de la revista: BIOFISICA / QUIMICA Año: 2024 Tipo del documento: Article País de afiliación: Alemania