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Clustered, Terraced And Mixed Surface Phases Of The Al70Pd21Mn9 Quasicrystal

Published online by Cambridge University Press:  10 February 2011

J. Ledieu ,
A. W. Munz ,
T. M. Parker ,
R. McGrath ,
R. D. Diehl ,
D. W. Delaney  and
T. A. Lograsso
J. Ledieu
Affiliation:
Surface Science Research Centre, The University of Liverpool, Liverpool L69 3BX, UK
A. W. Munz
Affiliation:
Surface Science Research Centre, The University of Liverpool, Liverpool L69 3BX, UK
T. M. Parker
Affiliation:
Surface Science Research Centre, The University of Liverpool, Liverpool L69 3BX, UK
R. McGrath
Affiliation:
Surface Science Research Centre, The University of Liverpool, Liverpool L69 3BX, UK
R. D. Diehl
Affiliation:
Department of Physics, Penn State University, University Park, PA 16802, USA
D. W. Delaney
Affiliation:
Ames Laboratory, Iowa State University, Ames, IA 50011, USA
T. A. Lograsso
Affiliation:
Ames Laboratory, Iowa State University, Ames, IA 50011, USA
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Abstract

The five-fold surface of the Al70 Pd21 Mn9 quasicrystal has been studied using STM, LEED and AES. STM images from surfaces which have been sputtered and annealed to 875 K reveal 20-30 Å protrusions that have been identified by others as Mackay-type clusters. Higher-resolution images reveal substructures in these clusters having dimensions 2-3 Å. Longer annealing times at 875 K produced large areas having flat terraces which were imaged with atomic resolution. The LEED pattern from this surface has sharp spots on a low background, and AES indicates that the surface is deficient in Mn relative to the bulk. For surfaces annealed to 1050 K for less than 2 hours, STM images indicate that cluster and terrace phases coexist, and a third phase having aligned arrays of clusters is identified which appears to be intermediate between the cluster and terrace phases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 237
Copyright
Copyright © Materials Research Society 1999

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References

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