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Competitive surface segregation of C, Al and S impurities in Fe(100)

Publication ,  Journal Article
Blum, V; Schmidt, A; Meier, W; Hammer, L; Heinz, K
Published in: Journal of Physics Condensed Matter
June 4, 2003

The stoichiometries and geometric structures formed by the segregation of C, Al and S on a Fe(100) surface have been investigated by Auger electron spectroscopy and quantitative low-energy electron diffraction (LEED). Stepwise annealing of a sputtered surface with increasing annealing temperature reveals the successive segregation of C, Al and S. According to quantitative LEED analyses, each segregand forms a distinct c(2 × 2) long-range ordered structure. Also, each segregand removes the preceding one from the surface entirely, i.e. segregation in the Fe(100)-(C, Al, S) system is purely competitive with no ordered co-segregation regimes involving two or even three elements. The c (2 × 2) phases of segregated carbon and sulfur consist of elemental surface adlayers with the adatoms residing in four-fold symmetric hollow sites of the iron substrate. This is in contrast to segregated Al which, according to an earlier analysis, forms a c(2 × 2)-symmetric surface alloy layer with iron. In all cases there is some chemical disorder within subsurface layers with Fe atoms substituted by Al. The bond lengths between the segregated adatoms and iron neighbours are close to the sum of the covalent radii of the elements involved whereby carbon appears to be five-fold coordinated, in contrast to four-fold coordinated sulfur.

Duke Scholars

Published In

Journal of Physics Condensed Matter

DOI

ISSN

0953-8984

Publication Date

June 4, 2003

Volume

15

Issue

21

Start / End Page

3517 / 3529

Related Subject Headings

  • Fluids & Plasmas
  • 5104 Condensed matter physics
  • 4018 Nanotechnology
  • 4016 Materials engineering
  • 1007 Nanotechnology
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics
 

Citation

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Blum, V., Schmidt, A., Meier, W., Hammer, L., & Heinz, K. (2003). Competitive surface segregation of C, Al and S impurities in Fe(100). Journal of Physics Condensed Matter, 15(21), 3517–3529. https://doi.org/10.1088/0953-8984/15/21/302
Blum, V., A. Schmidt, W. Meier, L. Hammer, and K. Heinz. “Competitive surface segregation of C, Al and S impurities in Fe(100).” Journal of Physics Condensed Matter 15, no. 21 (June 4, 2003): 3517–29. https://doi.org/10.1088/0953-8984/15/21/302.
Blum V, Schmidt A, Meier W, Hammer L, Heinz K. Competitive surface segregation of C, Al and S impurities in Fe(100). Journal of Physics Condensed Matter. 2003 Jun 4;15(21):3517–29.
Blum, V., et al. “Competitive surface segregation of C, Al and S impurities in Fe(100).” Journal of Physics Condensed Matter, vol. 15, no. 21, June 2003, pp. 3517–29. Scopus, doi:10.1088/0953-8984/15/21/302.
Blum V, Schmidt A, Meier W, Hammer L, Heinz K. Competitive surface segregation of C, Al and S impurities in Fe(100). Journal of Physics Condensed Matter. 2003 Jun 4;15(21):3517–3529.
Journal cover image

Published In

Journal of Physics Condensed Matter

DOI

ISSN

0953-8984

Publication Date

June 4, 2003

Volume

15

Issue

21

Start / End Page

3517 / 3529

Related Subject Headings

  • Fluids & Plasmas
  • 5104 Condensed matter physics
  • 4018 Nanotechnology
  • 4016 Materials engineering
  • 1007 Nanotechnology
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics