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Exafs Evidence For Atom Location In Icosahedral TiZrNi And Hydrogenated TiZrNi Quasicrystals

Published online by Cambridge University Press:  10 February 2011

A. Sadoc ,
J. K. Kim  and
K.F. Kelton
A. Sadoc
Affiliation:
Laboratoire de Physique des Matériaux et des Surfaces and GDR CINQ, Université de Cergy- Pontoise, Neuville sur Oise, 95031 Cergy-Pontoise Cedex, France, sadoc@u-cergy.fr Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, CNRS, MENESR, CEA, Bât. 209D, Centre Universitaire Paris-Sud, BP 34,91898 Orsay Cedex, France
J. K. Kim
Affiliation:
Department of Physics, Washington University, St. Louis, MO 63130, USA.
K.F. Kelton
Affiliation:
Department of Physics, Washington University, St. Louis, MO 63130, USA.
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Abstract

We present results from the first extended X-ray absorption fine-structure studies in a Ti/Zrbased quasicrystal. The icosahedral Ti53Zr27Ni20 phase and an icosahedral Ti45Zr38Ni17 phase that also contains 1.7 hydrogen atoms for each metal atom were investigated. Experiments performed above the Ti, Ni and Zr K absorption edges have allowed to identify different types of atomic subshells around the Ti, Ni and Zr atoms. Significant differences are observed between these two quasicrystalline alloys, suggesting preferential sites for the hydrogen atoms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 141
Copyright
Copyright © Materials Research Society 1999

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References

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