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Atomic Dynamics in Complex Metallic Alloys

Published online by Cambridge University Press:  23 January 2013

Holger Euchner
Affiliation:
ITAP, Universität Stuttgart, Pfaffenwaldring 57/6 , 70550 Stuttgart, Germany SIMAP, Grenoble-INP, CNRS, UJF, BP 75,38402 St Martin d’Hères Cedex, France Institute of Materials Science and Technology, TU Vienna, Karlsplatz 13, 1040 Wien, Austria
Stephane Pailhès
Affiliation:
Université de Lyon1, CNRS, 69622 Villeurbanne, France
Tsunetomo Yamada
Affiliation:
Department of Materials Science and Technology, Tokyo University, Noda 278-8510, Japan
Ryuji Tamura
Affiliation:
Department of Materials Science and Technology, Tokyo University, Noda 278-8510, Japan
Tsutomu Ishimasa
Affiliation:
Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
Stephane Rols
Affiliation:
Institut Laue Langevin, BP 156, 38042 Grenoble, Cedex 9, France
Helmut Schober
Affiliation:
Institut Laue Langevin, BP 156, 38042 Grenoble, Cedex 9, France Université Joseph Fourier, UFR de Physique, 38041 Grenoble Cedex 9, France
Marek Mihalkovic
Affiliation:
Institute of Physics, Slovak Academy of Sciences, 84228 Bratislava, Slovakia
Hans-Rainer Trebin
Affiliation:
ITAP, Universität Stuttgart, Pfaffenwaldring 57/6 , 70550 Stuttgart, Germany
Daniel Schopf
Affiliation:
ITAP, Universität Stuttgart, Pfaffenwaldring 57/6 , 70550 Stuttgart, Germany
Silke Paschen
Affiliation:
Institute of Solid State Physics, TU Vienna, Wiedener Hauptstr. 8-10, 1040 Wien, Austria
Amir Haghighirad
Affiliation:
Physikalisches Institut, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
Franz Ritter
Affiliation:
Physikalisches Institut, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
Wolf Assmus
Affiliation:
Physikalisches Institut, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
Yuri Grin
Affiliation:
MPI für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany
Lien Nguyen
Affiliation:
Institute of Solid State Physics, TU Vienna, Wiedener Hauptstr. 8-10, 1040 Wien, Austria
Marc de Boissieu
Affiliation:
SIMAP, Grenoble-INP, CNRS, UJF, BP 75,38402 St Martin d’Hères Cedex, France
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Abstract

Complex Metallic Alloys (CMAs) are metallic solids of high structural complexity, consisting of large numbers of atoms in their unit cells. Consequences of this structural complexity are manifold and give rise to a variety of exciting physical properties. The impact that such structural complexity may have on the lattice dynamics will be discussed. The surprising dynamical flexibility of Tsai-type clusters with the symmetry breaking central tetrahedron will be addressed for Zn6Sc, while in the Ba-Ge-Ni clathrate system the dynamics of encaged Ba guest atoms in the surrounding Ge-Ni host framework is analysed with respect to the experimentally evidenced strong reduction of lattice thermal conductivity. For both systems experimental results from neutron scattering are analyzed and interpreted on atomistic scale by means of ab initio and molecular dynamics simulations, resulting in a picture with the respective structural building blocks as the origin of the peculiarities in the dynamics.

Type
Articles
Copyright
Copyright © Materials Research Society 2013

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References

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