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Title: Structure of the Hydrated -Al2O3 (0001) Surface

Journal Article · · Science
 [1];  [2];  [3];  [4];  [1];  [1];  [1]
  1. Univ. of Chicago, IL (United States)
  2. Stanford Univ., CA (United States)
  3. Stanford Univ., CA (United States); Stanford Synchrotron Radiation Lightsource, Stanford, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (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). Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
FG02-94ER14466
OSTI ID:
1508033
Report Number(s):
DOE-UCHICAGO-14466-3
Journal Information:
Science, Vol. 288, Issue 5468; ISSN 0036-8075
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 470 works
Citation information provided by
Web of Science

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The atomistic origin of interface confinement and enhanced conversion efficiency in Si nanowire solar cells journal January 2016
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SURFACE STRUCTURES OF α- Fe 2 O 3 (0001) PHASES DETERMINED BY LEED CRYSTALLOGRAPHY journal December 2001
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Figures / Tables (3)