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Effect of temperature on the initial stages of oxidation of gamma-Al4Cu9(110)

机译:温度对γ-Al4Cu9(110)氧化初期的影响

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摘要

Combined X-ray photoemission spectroscopy and low energy electron diffraction investigations have been performed to study the influence of temperature on the first stages of oxidation of the (1 1 0) surface of gamma-Al(4)Cu(9)complex metallic alloy in the pressure range 2-6 x 10(-7) mbar. The oxidation mechanism is driven by aluminium segregation. At 115 K, a pure aluminium oxide film is formed, which does not present any long range order. Cu-O bonds are never observed. The lower oxidation kinetics compared to that previously observed at room temperature is due to blocking of the oxygen dissociation and/or a decrease in the aluminium segregation. However, aluminium segregation is still observed, even for this very low temperature, due to the low energy value of the activation energy for aluminium diffusion in gamma-Al4Cu9(0.65 +/- 0.12 eV) which is related to the presence of two vacancies in the crystal structure. At 925 K, fast aluminium segregation and possible oxygen diffusion into the bulk leads to the formation of domains or clusters of gamma-like alumina either on top of or, more likely, below the surface. (C) 2015 Elsevier B.V. All rights reserved.
机译:结合X射线光电子能谱和低能电子衍射研究已进行了研究,以研究温度对γ-Al(4)Cu(9)复杂金属合金(1 1 0)表面氧化的第一阶段的影响。压力范围2-6 x 10(-7)mbar。氧化机理是由铝的偏析驱动的。在115 K处,形成了纯氧化铝膜,该膜没有任何长程顺序。从未观察到Cu-O键。与先前在室温下观察到的相比,较低的氧化动力学是由于氧离解的阻止和/或铝偏析的减少。然而,即使在非常低的温度下,由于在γ-Al4Cu9中铝扩散的活化能的能量值较低(0.65 +/- 0.12 eV),这仍然与铝的偏析有关,这与存在两个空位有关。晶体结构。在925 K下,快速的铝偏析和可能的氧扩散到主体中会导致在表面顶部或更可能在表面下方形成γ状氧化铝的畴或团簇。 (C)2015 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Applied Surface Science》 |2015年第30期|208-213|共6页
  • 作者单位

    Univ Paris 11, CNRS, Inst Chim Mol & Mat Orsay, UMR 8182, F-91405 Orsay, France|CNRS, F-91405 Orsay, France;

    Univ Lorraine, CNRS, Inst Jean Lamour, UMR 7198, F-54011 Nancy, France;

    Univ Lorraine, CNRS, Inst Jean Lamour, UMR 7198, F-54011 Nancy, France;

    Univ Lorraine, CNRS, Inst Jean Lamour, UMR 7198, F-54011 Nancy, France;

    CNRS, F-91405 Orsay, France|Univ Paris 11, CNRS, Inst Chim Mol & Mat Orsay, UMR 8182, F-91405 Orsay, France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Complex metallic alloys; Initial oxidation; XPS; LEED;

    机译:复杂金属合金;初始氧化;XPS;LEED;

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