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Modifications 7 And 8 Of Decagonal AI-Co-Ni

Published online by Cambridge University Press:  10 February 2011

S. Ritsch ,
K. Hiraga ,
C. Beeli ,
T. Gödecke ,
M. Scheffer  and
R. Lück
S. Ritsch
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2–1-1, Aoba-ku, Sendai 980–8577, Japan, ritsch@imr.tohoku.ac.jp
K. Hiraga
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2–1-1, Aoba-ku, Sendai 980–8577, Japan, ritsch@imr.tohoku.ac.jp
C. Beeli
Affiliation:
Lab. for Solid State Physics, ETH Zürich, CH-8093 Z¨rich, Switzerland
T. Gödecke
Affiliation:
Max-Planck-Institute for Metal-Research, Seestr. 92, D-70174 Stuttgart, Germany
M. Scheffer
Affiliation:
Max-Planck-Institute for Metal-Research, Seestr. 92, D-70174 Stuttgart, Germany
R. Lück
Affiliation:
Max-Planck-Institute for Metal-Research, Seestr. 92, D-70174 Stuttgart, Germany
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Abstract

Besides the six established decagonal states of the Al-Co-Ni quasicrystal two more modifications have been discovered by means of transmission electron microscopy. One is a pentagonal quasicrystal with a superstructure found in specimens with a very high Co-content and quenched from the highest possible temperature lying within the stability field of decagonal Al-Co-Ni. Its electron diffraction patterns are characterized by a 5-fold rotation axis as a unique symmetry element as well as superstructure reflections similar to those of a related decagonal phase. The other is a one-dimensional quasicrystal closely related to decagonal Al-Co-Ni. The modulation length of 61 Å along the periodic direction in its pseudo 10-fold diffraction patterns can be assumed to be caused by a strong linear, uniform, phason strain in the material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 171
Copyright
Copyright © Materials Research Society 1999

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References

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