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- W2799455501 abstract "The adsorption of Ir adatoms on Al(100) has been investigated under various exposures and temperature conditions. The experimental and theoretical results reveal a diffusion of Ir adatoms within the Al(100) surface selvedge already at 300 K. Above 593 K, two domains of a $(sqrt{5}ifmmodetimeselsetexttimesfi{}sqrt{5})R26.{6}^{ensuremath{circ}}$ phase are identified by low energy electron diffraction (LEED) and scanning tunneling microscopy measurements. This phase corresponds to the initial growth of an ${mathrm{Al}}_{9}{mathrm{Ir}}_{2}$ compound at the Al(100) surface. The ${mathrm{Al}}_{9}{mathrm{Ir}}_{2}$ intermetallic domains are terminated by bulklike pure Al layers. The structural stability of ${mathrm{Al}}_{9}{mathrm{Ir}}_{2}$(001) grown on Al(100) has been analyzed by density functional theory based calculations. Dynamical LEED analysis is consistent with an Ir adsorption leading to the growth of an ${mathrm{Al}}_{9}{mathrm{Ir}}_{2}$ intermetallic compound. We propose that the epitaxial relationship ${mathrm{Al}}_{9}{mathrm{Ir}}_{2}(001)ensuremath{parallel}mathrm{Al}$(100) and ${mathrm{Al}}_{9}{mathrm{Ir}}_{2}[100]ensuremath{parallel}mathrm{Al}[031]/[013]$ originates from a matching of Al atomic arrangements present both on Al(100) and on pure Al(001) layers present in the ${mathrm{Al}}_{9}{mathrm{Ir}}_{2}$ compound. Finally, the interface between ${mathrm{Al}}_{9}{mathrm{Ir}}_{2}$ precipitates and the Al matrix has been characterized by transmission electron microscopy measurements. The cross-sectional observations are consistent with the formation of ${mathrm{Al}}_{9}{mathrm{Ir}}_{2}$(001) compounds. These measurements indicate an important Ir diffusion within Al(100) near the surface region. The coherent interface between ${mathrm{Al}}_{9}{mathrm{Ir}}_{2}$ and the Al matrix is sharp." @default.
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- W2799455501 date "2018-04-25" @default.
- W2799455501 modified "2023-10-16" @default.
- W2799455501 title "Epitaxial growth of Al9Ir2 intermetallic compound on Al(100): Mechanism and interface structure" @default.
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- W2799455501 doi "https://doi.org/10.1103/physrevmaterials.2.043405" @default.
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