Structure of the Hydrated -Al2O3 (0001) Surface
- Univ. of Chicago, IL (United States); The University of Chicago
- Stanford Univ., CA (United States)
- Stanford Univ., CA (United States); Stanford Synchrotron Radiation Lightsource, Stanford, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of Chicago, IL (United States)
The physical and chemical properties of the hydrated α-Al2O3 (0001) surface are important for understanding the reactivity of natural and synthetic aluminum-containing oxides. The structure of this surface was determined in the presence of water vapor at 300 kelvin by crystal truncation rod diffraction at a third-generation synchrotron x-ray source. The fully hydrated surface is oxygen terminated, with a 53% contracted double Al layer directly below. The structure is an intermediate between α-Al2O3 and γ-Al(OH)3, a fully hydroxylated form of alumina. A semiordered oxygen layer about 2.3 angstroms above the terminal oxygen layer is interpreted as adsorbed water. The clean α-Al2O3 (0001) surface, in contrast, is Al terminated and significantly relaxed relative to the bulk structure. These differences explain the different reactivities of the clean and hydroxylated surfaces.
- Research Organization:
- Univ. of Chicago, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
- Grant/Contract Number:
- FG02-94ER14466
- OSTI ID:
- 1508033
- Report Number(s):
- DOE-UCHICAGO--14466-3
- Journal Information:
- Science, Journal Name: Science Journal Issue: 5468 Vol. 288; ISSN 0036-8075
- Publisher:
- AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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