Author
Listed:
- C.P. WANG
(Department of Materials Science and Engineering, State University of New York, Stony Brook, NY 11794–2275, USA)
- S.K. KIM
(Department of Materials Science and Engineering, State University of New York, Stony Brook, NY 11794–2275, USA)
- F. JONA
(Department of Materials Science and Engineering, State University of New York, Stony Brook, NY 11794–2275, USA)
- D.R. STRONGIN
(Department of Chemistry, State University of New York, Stony Brook, NY 11794–3400, USA)
- B.-R. SHEU
(Department of Chemistry, State University of New York, Stony Brook, NY 11794–3400, USA)
- P.M. MARCUS
(Department of Materials Science and Engineering, State University of New York, Stony Brook, NY 11794–2275, USA)
Abstract
The atomic structure of a clean (010) surface of the ordered binary alloyTiAl(with tetragonal bulk structure of theCuAuI type) is studied with quantitative low-energy electron diffraction (QLEED). Two different surface phases are found depending on the preparation procedure. After a cleaning stepin vacuoby means of Ar-ion bombardments, anneals at 750−850°C produce a2×1surface and anneals at about 900° C produce a1×1surface. A QLEED intensity analysis of the1×1structure reveals the occurrence of chemical reconstruction, whereby theTiatoms in the first layer exchange places with theAlatoms in the second layer. Thus, while any bulk (010) plane contains 50%Aland 50%Ti, the top atomic layer of a (010) surface contains 100%Aland the second atomic layer contains 100%Ti. Both layers are slightly buckled and the first interlayer distance is compressed about 7.1% while the second interlayer spacing is expanded about 7.4% with respect to the bulk value.
Suggested Citation
C.P. Wang & S.K. Kim & F. Jona & D.R. Strongin & B.-R. Sheu & P.M. Marcus, 1995.
"CHEMICAL RECONSTRUCTION OF THETiAl(010)SURFACE,"
Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 2(02), pages 183-189.
Handle:
RePEc:wsi:srlxxx:v:02:y:1995:i:02:n:s0218625x95000200
DOI: 10.1142/S0218625X95000200
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