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Irreversible Structural Transformation of five fold i-AlPdMn Quasicrystals after Ion Bombardment and Annealing

Published online by Cambridge University Press:  17 March 2011

F. Schmithüsen ,
G. Cappello ,
S. Decossas ,
G. Torricelli ,
T.-L. Lee ,
M. de Boissieu ,
Y. Calvayrac ,
T. Lograsso ,
F. Comin  and
J. Chevrier
F. Schmithüsen
Affiliation:
ESRF, BP220, Grenoble cedex, France
G. Cappello
Affiliation:
ESRF, BP220, Grenoble cedex, France Institut Curie - Section de Recherche, Paris Cedex 05, France
S. Decossas
Affiliation:
ESRF, BP220, Grenoble cedex, France
G. Torricelli
Affiliation:
ESRF, BP220, Grenoble cedex, France
T.-L. Lee
Affiliation:
ESRF, BP220, Grenoble cedex, France
M. de Boissieu
Affiliation:
LTPCM INPG BP 75 Saint Martin d'Hères, France
Y. Calvayrac
Affiliation:
C.E.C.M._C.N.R.S., 15, rue G. Urbain, Vitry CEDEX, France
T. Lograsso
Affiliation:
Ames Laboratory/Iowa State University, Ames, IA 50011, USA
F. Comin
Affiliation:
ESRF, BP220, Grenoble cedex, France
J. Chevrier
Affiliation:
ESRF, BP220, Grenoble cedex, France LEPES-CNRS, BP 166, Grenoble cedex 9, France Université Joseph Fourier, Grenoble, France
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Abstract

Five fold i-AlPdMn surface prepared under UHV by ion bombardment and annealing was so far considered to be bulk terminated. This result was substantially based on a quantitative LEED analyses [1]. Analysis of the specular rod in a X ray diffraction experiment at grazing incidence supported this result [2]. We present a new study of this surface by high resolution X ray diffraction at normal incidence. In this Bragg configuration the diffraction peak 18 – 29 for instance is at a photon energy of 2.873keV, the 72 – 116 reflection at 5.725keV. This results in an analyzed thickness of the sample surface of a few micrometers.

The surface was cleaned by ion bombardment. During annealing (T≅880K), we clearly observed the progressive disappearance of the initial Bragg peak characteristic of the as cast bulk sample. Conversely a new Bragg peak grows at an energy position shifted by 1eV compared to the position of the original Bragg peak. This is a clear signature for an irreversible structural transformation which takes place on at least the micron thickness. On the transformed surface, both, a LEED pattern and a RHEED pattern, characteristic for a five fold surface were easily obtained.

This high resolution experiment (the relative Bragg peak shift is 3ׁ10−4) was reproduced on samples from different initial compositions. This shows that five fold i-AlPdMn surface changes after preparation by ion bombardment and annealing at 900K on a micrometer thickness. This is not consistent with the conclusion that the surface is simply terminated by a cut of the original bulk. We conclude that a reorganization process of the quasicrystalline structure during annealing proceeds in the surface vicinity (probed depth is close to a few microns).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K11.2
Copyright
Copyright © Materials Research Society 2001

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References

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