The surface structure of a β-Al(Cu1-xFex)-(110) film formed on an AlCuFe quasicrystal substrate, analyzed by dynamical LEED

F. Shi; Z. Shen; D. W. Delaney; A. I. Goldman; C. J. Jenks; M. J. Kramer; T. Lograsso; P. A. Thiel; M. A. Van Hove

doi:10.1016/S0039-6028(98)00334-3

The surface structure of a β-Al(Cu_1-xFe_x)-(110) film formed on an AlCuFe quasicrystal substrate, analyzed by dynamical LEED

F. Shi, Z. Shen, D. W. Delaney, A. I. Goldman, C. J. Jenks, M. J. Kramer, T. Lograsso, P. A. Thiel, M. A. Van Hove

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

In order to understand the unique properties of quasicrystalline surfaces, it is paramount to compare quasicrystalline and crystalline surfaces of similar chemical composition. To that end, the fivefold surface of an AlCuFe quasicrystal substrate was transformed, by ion bombardment and annealing, into a film with the β-Al(Cu_1-xFe_x) bulk structure. This is a CsCl structure with Fe and Cu atoms randomly occupying the body-center sites, and Al atoms at the corner sites. The film exposes a (110) free surface: its external structure was analyzed by dynamical low-energy electron diffraction in terms of atomic positions and layer-wise composition. The best fit between theory and experiment slightly favors a copper-rich composition in the surface layers (x = 0), although the sensitivity to the value of x is low, because Cu and Fe are very similar electron scatterers. The Al atoms in the surface layer buckle outward by 0.12 ± 0.04 Å relative to the Cu or Fe atoms in the same layer, while other relaxations from the bulk structure are small.

Original language	English
Pages (from-to)	86-98
Number of pages	13
Journal	Surface Science
Volume	411
Issue number	1-2
DOIs	https://doi.org/10.1016/S0039-6028(98)00334-3
State	Published - Aug 11 1998
Externally published	Yes

Funding

This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Sciences Division, of the U.S. Department of Energy under Contracts No. DE-AC03-76SF00098 and W-405-Eng-82.

Funders	Funder number
Materials Sciences Division
Office of Energy Research
U.S. Department of Energy	W-405-Eng-82, DE-AC03-76SF00098
Basic Energy Sciences

Keywords

Alloys
Aluminum
Low energy electron diffraction (LEED)
Metallic surfaces

Access to Document

10.1016/S0039-6028(98)00334-3

Cite this

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title = "The surface structure of a β-Al(Cu1-xFex)-(110) film formed on an AlCuFe quasicrystal substrate, analyzed by dynamical LEED",

abstract = "In order to understand the unique properties of quasicrystalline surfaces, it is paramount to compare quasicrystalline and crystalline surfaces of similar chemical composition. To that end, the fivefold surface of an AlCuFe quasicrystal substrate was transformed, by ion bombardment and annealing, into a film with the β-Al(Cu1-xFex) bulk structure. This is a CsCl structure with Fe and Cu atoms randomly occupying the body-center sites, and Al atoms at the corner sites. The film exposes a (110) free surface: its external structure was analyzed by dynamical low-energy electron diffraction in terms of atomic positions and layer-wise composition. The best fit between theory and experiment slightly favors a copper-rich composition in the surface layers (x = 0), although the sensitivity to the value of x is low, because Cu and Fe are very similar electron scatterers. The Al atoms in the surface layer buckle outward by 0.12 ± 0.04 {\AA} relative to the Cu or Fe atoms in the same layer, while other relaxations from the bulk structure are small.",

keywords = "Alloys, Aluminum, Low energy electron diffraction (LEED), Metallic surfaces",

author = "F. Shi and Z. Shen and Delaney, {D. W.} and Goldman, {A. I.} and Jenks, {C. J.} and Kramer, {M. J.} and T. Lograsso and Thiel, {P. A.} and {Van Hove}, {M. A.}",

year = "1998",

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doi = "10.1016/S0039-6028(98)00334-3",

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T1 - The surface structure of a β-Al(Cu1-xFex)-(110) film formed on an AlCuFe quasicrystal substrate, analyzed by dynamical LEED

AU - Shi, F.

AU - Shen, Z.

AU - Delaney, D. W.

AU - Goldman, A. I.

AU - Jenks, C. J.

AU - Kramer, M. J.

AU - Lograsso, T.

AU - Thiel, P. A.

AU - Van Hove, M. A.

PY - 1998/8/11

Y1 - 1998/8/11

N2 - In order to understand the unique properties of quasicrystalline surfaces, it is paramount to compare quasicrystalline and crystalline surfaces of similar chemical composition. To that end, the fivefold surface of an AlCuFe quasicrystal substrate was transformed, by ion bombardment and annealing, into a film with the β-Al(Cu1-xFex) bulk structure. This is a CsCl structure with Fe and Cu atoms randomly occupying the body-center sites, and Al atoms at the corner sites. The film exposes a (110) free surface: its external structure was analyzed by dynamical low-energy electron diffraction in terms of atomic positions and layer-wise composition. The best fit between theory and experiment slightly favors a copper-rich composition in the surface layers (x = 0), although the sensitivity to the value of x is low, because Cu and Fe are very similar electron scatterers. The Al atoms in the surface layer buckle outward by 0.12 ± 0.04 Å relative to the Cu or Fe atoms in the same layer, while other relaxations from the bulk structure are small.

AB - In order to understand the unique properties of quasicrystalline surfaces, it is paramount to compare quasicrystalline and crystalline surfaces of similar chemical composition. To that end, the fivefold surface of an AlCuFe quasicrystal substrate was transformed, by ion bombardment and annealing, into a film with the β-Al(Cu1-xFex) bulk structure. This is a CsCl structure with Fe and Cu atoms randomly occupying the body-center sites, and Al atoms at the corner sites. The film exposes a (110) free surface: its external structure was analyzed by dynamical low-energy electron diffraction in terms of atomic positions and layer-wise composition. The best fit between theory and experiment slightly favors a copper-rich composition in the surface layers (x = 0), although the sensitivity to the value of x is low, because Cu and Fe are very similar electron scatterers. The Al atoms in the surface layer buckle outward by 0.12 ± 0.04 Å relative to the Cu or Fe atoms in the same layer, while other relaxations from the bulk structure are small.

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KW - Aluminum

KW - Low energy electron diffraction (LEED)

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