Issue |
Europhys. Lett.
Volume 33, Number 3, January III 1996
|
|
---|---|---|
Page(s) | 199 - 204 | |
Section | Condensed matter: structure, thermal and mechanical properties | |
DOI | https://doi.org/10.1209/epl/i1996-00321-x | |
Published online | 01 September 2002 |
Phason softening in the AlPdMn icosahedral phase
1
Laboratoire de Thermodynamique et Physico-Chimie Métallurgiques UA
CNRS 29, ENSEEG, BP 75 - 38402, St. Martin d'Heres Cedex, France
2
Laboratoire Léon Brillouin, Centre d'Energie Nucléaire Saclay
91191 Gif sur Yvette Cedex, France
3
Institut Laue-Langevin BP 156 - 38042 Grenoble Cedex 9, France
Received:
21
July
1995
Accepted:
4
December
1995
The diffuse scattering located close to Bragg reflections has been
studied as a function of the temperature on a single grain of the AlPdMn
icosahedral phase. Between C and
C there is a
reversible and continuous transition. When the temperature increases, the
diffuse scattering diminishes whereas high-
reflections have
their intensity increased. All results are well interpreted within the
elasticity theory of quasi-crystals: the changes in diffuse scattering
shape and intensity when lowering the temperature are due to a softening
of the K1 phason elastic constant. The time decay of these
long-wavelength phason fluctuations is larger than 5 ns.
PACS: 61.44.+p – Quasicrystals / 61.12.-q – Neutron diffraction and scattering
© EDP Sciences, 1996
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