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

Eng, Peter J ; Trainor, Thomas P ; Brown Jr, Gordon E ; Waychunas, Glenn A ; Newville, Matthew ; Sutton, Stephen R ; Rivers, Mark L; Lawrence Berkeley National Lab., Ca (Us) (Corporate Author)

Science, 12 May 2000, Vol.288(5468) [Tạp chí có phản biện]

ISSN: 0193-4511

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  • Nhan đề:
    Structure of the hydrated alpha-Al{sub 2}O{sub 3} (0001) surface
  • Tác giả: Eng, Peter J ; Trainor, Thomas P ; Brown Jr, Gordon E ; Waychunas, Glenn A ; Newville, Matthew ; Sutton, Stephen R ; Rivers, Mark L
  • Lawrence Berkeley National Lab., Ca (Us) (Corporate Author)
  • Chủ đề: Materials Science ; Aluminium Oxides ; Hydrates ; Surface Properties ; Morphology ; Sciences (General)
  • Là 1 phần của: Science, 12 May 2000, Vol.288(5468)
  • Mô tả: The physical and chemical properties of the hydrated [Alpha]-[Al.sub.2][O.sub.3] (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 [Alpha]-[Al.sub.2][O.sub.3] and [Gamma]-Al[(OH).sub.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 [Alpha]-[Al.sub.2][O.sub.3] (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.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0193-4511

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