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Segregation and ordering at Fe1-xAlx(1 0 0) surfaces - a model case for binary alloys

Publication ,  Journal Article
Blum, V; Hammer, L; Meier, W; Heinz, K; Schmid, M; Lundgren, E; Varga, P
Published in: Surface Science
March 1, 2001

The geometrical structure, chemical order and composition of (1 0 0) oriented surfaces of the binary alloy system Fe1-xAlx were investigated in the Fe-rich regime (x = 0.03, 0.15, and 0.30) using quantitative low-energy electron diffraction. Low-energy He+ ion scattering and scanning tunneling microscopy were additionally employed to characterize the x = 0.15 sample. The equilibrium structures developing with increasing bulk Al content can be consistently explained by the interplay between Al surface segregation and ordering processes which are controlled by atomic interactions similar to those in the bulk. These interactions divide the process of Al segregation to the very surface into two steps whereby Al atoms occupy sites of two different sublattices of c(2×2) periodicity with different probability. Whilst one sublattice is already completely filled at low bulk Al concentration, the other sublattice fills only gradually with increasing bulk Al content. The local order in deeper layers is consistent with the bulk phase diagram.

Duke Scholars

Published In

Surface Science

DOI

ISSN

0039-6028

Publication Date

March 1, 2001

Volume

474

Issue

1-3

Start / End Page

81 / 97

Related Subject Headings

  • Chemical Physics
  • 0306 Physical Chemistry (incl. Structural)
  • 0206 Quantum Physics
  • 0204 Condensed Matter Physics
 

Citation

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Blum, V., Hammer, L., Meier, W., Heinz, K., Schmid, M., Lundgren, E., & Varga, P. (2001). Segregation and ordering at Fe1-xAlx(1 0 0) surfaces - a model case for binary alloys. Surface Science, 474(1–3), 81–97. https://doi.org/10.1016/S0039-6028(00)00987-0
Blum, V., L. Hammer, W. Meier, K. Heinz, M. Schmid, E. Lundgren, and P. Varga. “Segregation and ordering at Fe1-xAlx(1 0 0) surfaces - a model case for binary alloys.” Surface Science 474, no. 1–3 (March 1, 2001): 81–97. https://doi.org/10.1016/S0039-6028(00)00987-0.
Blum V, Hammer L, Meier W, Heinz K, Schmid M, Lundgren E, et al. Segregation and ordering at Fe1-xAlx(1 0 0) surfaces - a model case for binary alloys. Surface Science. 2001 Mar 1;474(1–3):81–97.
Blum, V., et al. “Segregation and ordering at Fe1-xAlx(1 0 0) surfaces - a model case for binary alloys.” Surface Science, vol. 474, no. 1–3, Mar. 2001, pp. 81–97. Scopus, doi:10.1016/S0039-6028(00)00987-0.
Blum V, Hammer L, Meier W, Heinz K, Schmid M, Lundgren E, Varga P. Segregation and ordering at Fe1-xAlx(1 0 0) surfaces - a model case for binary alloys. Surface Science. 2001 Mar 1;474(1–3):81–97.
Journal cover image

Published In

Surface Science

DOI

ISSN

0039-6028

Publication Date

March 1, 2001

Volume

474

Issue

1-3

Start / End Page

81 / 97

Related Subject Headings

  • Chemical Physics
  • 0306 Physical Chemistry (incl. Structural)
  • 0206 Quantum Physics
  • 0204 Condensed Matter Physics