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Segregation phenomena on surfaces of the ordered bimetallic alloy FeAl

Publication ,  Journal Article
Hammer, L; Graupner, H; Blum, V; Heinz, K; Ownby, GW; Zehner, DM
Published in: Surface Science
September 3, 1998

The segregation and ordering behavior of the (100), (110), (210), (310) and (111) surfaces of the ordered intermetallic compound FeAl were investigated by means of AES and LEED. Starting from preferentially sputtered, i.e. Al-depleted surfaces sequential annealing leads to segregation of aluminum for all five surfaces. For intermediate annealing temperatures several ordered superstructures are found for the low index surfaces, which can partly be attributed to metastable Fe3Al films developing at the surfaces. All well-annealed surfaces exhibit Al concentrations beyond bulk stoichiometry. The (100) surface is found to be Al terminated, additionally the second layer is enriched in Al. For all other FeAl surfaces no 1 × 1 diffraction patterns are observed in the whole temperature range up to 1000°C, indicating the absence of bulk terminated surfaces, in contrast to the equivalent surfaces of NiAl. An incommensurate surface alloy of FeAl2 stoichiometry finally forms on the most densely packed FeAl(110) surface. The other more open surfaces are characterized by multilayer segregation of Al. While (111) and (210) surfaces develop long-range surface reconstructions (3 × 3 and 1 × 3), the (310) surface is unstable and facets. The differences in the segregation behavior between NiAl and FeAl can qualitatively be explained by a combination of different segregation models using the heat of formation of the alloy. © 1998 Elsevier Science B.V. All rights reserved.

Duke Scholars

Published In

Surface Science

DOI

ISSN

0039-6028

Publication Date

September 3, 1998

Volume

412-413

Start / End Page

69 / 81

Related Subject Headings

  • Chemical Physics
  • 5108 Quantum physics
  • 5104 Condensed matter physics
  • 3406 Physical chemistry
  • 0306 Physical Chemistry (incl. Structural)
  • 0206 Quantum Physics
  • 0204 Condensed Matter Physics
 

Citation

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Hammer, L., Graupner, H., Blum, V., Heinz, K., Ownby, G. W., & Zehner, D. M. (1998). Segregation phenomena on surfaces of the ordered bimetallic alloy FeAl. Surface Science, 412413, 69–81. https://doi.org/10.1016/S0039-6028(98)00370-7
Hammer, L., H. Graupner, V. Blum, K. Heinz, G. W. Ownby, and D. M. Zehner. “Segregation phenomena on surfaces of the ordered bimetallic alloy FeAl.” Surface Science 412–413 (September 3, 1998): 69–81. https://doi.org/10.1016/S0039-6028(98)00370-7.
Hammer L, Graupner H, Blum V, Heinz K, Ownby GW, Zehner DM. Segregation phenomena on surfaces of the ordered bimetallic alloy FeAl. Surface Science. 1998 Sep 3;412–413:69–81.
Hammer, L., et al. “Segregation phenomena on surfaces of the ordered bimetallic alloy FeAl.” Surface Science, vol. 412–413, Sept. 1998, pp. 69–81. Scopus, doi:10.1016/S0039-6028(98)00370-7.
Hammer L, Graupner H, Blum V, Heinz K, Ownby GW, Zehner DM. Segregation phenomena on surfaces of the ordered bimetallic alloy FeAl. Surface Science. 1998 Sep 3;412–413:69–81.
Journal cover image

Published In

Surface Science

DOI

ISSN

0039-6028

Publication Date

September 3, 1998

Volume

412-413

Start / End Page

69 / 81

Related Subject Headings

  • Chemical Physics
  • 5108 Quantum physics
  • 5104 Condensed matter physics
  • 3406 Physical chemistry
  • 0306 Physical Chemistry (incl. Structural)
  • 0206 Quantum Physics
  • 0204 Condensed Matter Physics