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Structure of the hydrated alpha-Al(2)O(3) (0001) surface

Eng1, Trainor, Brown

  • 1Consortium for Advanced Radiation Sources, The University of Chicago, Chicago, IL 60637, USA. Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305-2115, USA. Stanford Synchrotron Radiation Laboratory, Sta.

Science (New York, N.Y.)
|May 12, 2000
PubMed
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The hydrated alpha-alumina (0001) surface is oxygen-terminated, differing from the clean, aluminum-terminated surface. This hydrated structure influences the reactivity of aluminum oxides.

Area of Science:

  • Surface science
  • Materials science
  • Chemistry

Background:

  • The physical and chemical properties of aluminum oxide surfaces are crucial for understanding their reactivity.
  • The alpha-Al(2)O(3) (0001) surface's behavior in the presence of water is key to its applications.

Purpose of the Study:

  • To determine the atomic structure of the hydrated alpha-Al(2)O(3) (0001) surface.
  • To compare the hydrated surface structure with the clean surface structure.

Main Methods:

  • Crystal truncation rod diffraction using synchrotron X-ray radiation.
  • In-situ surface analysis under water vapor at 300 Kelvin.

Main Results:

  • The hydrated alpha-Al(2)O(3) (0001) surface is oxygen-terminated with a contracted aluminum layer beneath.

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  • An adsorbed water layer was identified approximately 2.3 angstroms above the surface.
  • The hydrated structure represents an intermediate between alpha-Al(2)O(3) and gamma-Al(OH)(3).
  • The clean alpha-Al(2)O(3) (0001) surface is aluminum-terminated and relaxed.

    • Conclusions:

    • The hydrated and clean alpha-Al(2)O(3) (0001) surfaces exhibit distinct structures.
    • These structural differences explain the varying reactivities of clean versus hydroxylated aluminum oxide surfaces.