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Adsorption of oxygen on low-index surfaces of Ti3Al alloy

  • Surface Physics, Thin Films
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Abstract

The atomic and electronic structure of the three surfaces of Ti3Al alloy—(0001), (\(1\bar 100\)), and (\(11\bar 20\))—is calculated by the projector augmented-wave method in the framework of the electron density functional theory. The surface energies are estimated as a function of the chemical potential of aluminum, which made it possible to construct a stability diagram for the surfaces under study. Adsorption of oxygen on differently oriented surfaces of the alloy is studied. It is found that the most preferred positions for oxygen adsorption are hollow positions on the (0001) and (\(11\bar 20\))Ti–Al surfaces and bridge positions on the (\(1\bar 100\))Ti‒Al-1 surface. Structural and electronic factors that determine these energy preferences are discussed. It is shown that regardless of the orientation of the surface, oxygen “prefers” titanium-enriched positions. The effect of oxygen on the atomic and electronic structure of low-index surfaces is discussed. It is found that at low concentrations of oxygen, the formation of its chemical bond with titanium and/or aluminum atoms in the surface and subsurface layers leads to the appearance of low-lying states split off from the bottom of the valence bands of metals, which is accompanied by the formation of a pseudogap and the weakening of Ti‒Al metal bonds in the surface layers.

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Authors and Affiliations

  1. Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Tomsk, 634055, Russia

    A. M. Latyshev, A. V. Bakulin & S. E. Kulkova

  2. Tomsk National Research State University, Tomsk, 634050, Russia

    A. M. Latyshev, A. V. Bakulin & S. E. Kulkova

Authors
  1. A. M. Latyshev
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  2. A. V. Bakulin
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  3. S. E. Kulkova
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Correspondence to A. V. Bakulin.

Additional information

Original Russian Text © A.M. Latyshev, A.V. Bakulin, S.E. Kulkova, 2017, published in Fizika Tverdogo Tela, 2017, Vol. 59, No. 9, pp. 1828–1842.

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Latyshev, A.M., Bakulin, A.V. & Kulkova, S.E. Adsorption of oxygen on low-index surfaces of Ti3Al alloy. Phys. Solid State 59, 1852–1866 (2017). https://doi.org/10.1134/S1063783417090165

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