Atomic rippling of a metallic ordered alloy surface--NiAl(110)
Results from a low-energy electron diffraction (LEED) analysis of the NiAl(110) surface are presented and discussed. Ordered NiAl has a truncated bulk (110) surface consisting of composite layers of Ni and Al sites which are exactly coplanar. However, the present LEED results demonstrate that the actual NiAl(110) surface has a large rippled relaxation, with the Al sites of the outermost composite layer being 0.22 A above the Ni sites. The agreement achieved between the calculated and experimental I--V profiles, total R factor of 0.053, is of the same quality as that obtained in better LEED analyses of monatomic metallic surfaces, which indicates the evidence for the rippling is quite strong. Also, a qualitative plausibility argument is given to indicate that such rippling is to be expected in surfaces of ordered alloys.
- Research Organization:
- Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5494487
- Journal Information:
- J. Vac. Sci. Technol., A; (United States), Journal Name: J. Vac. Sci. Technol., A; (United States) Vol. 3:3; ISSN JVTAD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
COHERENT SCATTERING
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON DIFFRACTION
INTERMETALLIC COMPOUNDS
NICKEL ALLOYS
PHYSICAL PROPERTIES
SCATTERING
SURFACE PROPERTIES
SURFACES