J. Phys. France
Volume 51, Numéro 17, septembre 1990
Page(s) 1785 - 1790
J. Phys. France 51, 1785-1790 (1990)
DOI: 10.1051/jphys:0199000510170178500

Inelastic neutron scattering study of acoustic modes in a monodomain AlCuFe quasicrystal

M. Quilichini1, G. Heger1, B. Hennion1, S. Lefebvre2, 3 et A. Quivy2

1  Laboratoire Léon Brillouin (CEA-CNRS), CEN-Saclay, 91191 Gif-sur-Yvette Cedex, France
2  CECM/CNRS, 15 rue G. Urbain, 94400 Vitry Cedex, France
3  LURE, bât. 209D, Université Paris-Sud, 91405 Orsay Cedex, France

Inelastic neutron scattering results evidenced for the first time that acoustic phonon modes can be observed for a quasicrystal. The triple-axes experiments have been performed on a small monodomain Al63Cu 25Fe12 sample. The obtained TA and LA dispersion curves near to strong Bragg peaks do not show any variation with respect to different Q values. Their slopes are isotropic and do not depend on special symmetry directions; they are comparable to those of corresponding curves for pure aluminium. We have not been able to observe energy gaps in our measurements.

6320D - Phonon states and bands, normal modes, and phonon dispersion.
6166D - Alloys.

Key words
aluminium alloys -- copper alloys -- iron alloys -- lattice dynamics of metallic crystals -- neutron diffraction examination of materials -- phonon dispersion relations -- quasicrystals