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Debye Temperature at the Fivefold- and Threefold-Symmetry Surface of the Al-Pd-Mn Quasicrystal.

Published online by Cambridge University Press:  01 February 2011

R. Lüscher ,
T. Flückiger ,
M. Erbudak  and
A. R. Kortan
R. Lüscher
Affiliation:
Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland.
T. Flückiger
Affiliation:
Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland.
M. Erbudak
Affiliation:
Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland.
A. R. Kortan
Affiliation:
Guest Scientist.
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Abstract

Specular-beam intensity profiles are measured in low-energy electron diffraction as a function of temperature for the fivefold- and threefold-symmetry surfaces of the icosahedral quasicrystal Al-Pd-Mn. The resulting shifts of the Bragg-peaks to lower energies are accounted for mainly by a lattice expansion perpendicular to the surface and allow us to determine the thermal expansion coefficient of atomic layers to be (24.5 ± 2.0) × 10−6 K−1 for both surfaces. As a result of several measurements, a surface Debye temperature of 298 ± 7 K is found for the pentagonal and 301 ± 10 K for the threefold-symmetry surface. This similarity implies comparable bonding forces for the atoms at these surfaces. Additionally, the derived thermal expansion coefficient supports a layer-based structural model for both surfaces investigated here.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 805: Symposium LL – Quasicrystals , 2003 , LL8.7
Copyright
Copyright © Materials Research Society 2004

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