Fivefold surface of quasicrystalline AlPdMn: Structure determination using low-energy-electron diffraction
- Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 (United States)
- Department of Physics and Astronomy and the Ames Laboratory, Iowa State University, Ames, Iowa50011 (United States)
- Department of Chemistry and the Ames Laboratory, Iowa State University, Ames, Iowa 50011 (United States)
The atomic structure of the fivefold symmetric quasicrystal surface of icosahedral AlPdMn has been investigated by means of a dynamical low-energy-electron diffraction (LEED) analysis. Approximations were developed to make the structure of an aperiodic, quasicrystalline surface region accessible to LEED theory. A mix of several closely similar, relaxed, bulklike lattice terminations is favored, all of which have a dense Al-rich layer on top followed by a layer with a composition of about 50{percent} Al and 50{percent} Pd. The interlayer spacing between these two topmost layers is contracted from the bulk value by 0.1 {Angstrom}, to a final value of 0.38 {Angstrom}, and the lateral density of the two topmost layers taken together is similar to that of an Al(111) surface. The LEED structural result is qualitatively consistent with data from ion scattering spectroscopy, which supports an Al-rich termination. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 625873
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 13 Vol. 57; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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