Numéro
J. Phys. IV France
Volume 06, Numéro C8, Décembre 1996
ICIFUAS 11
Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
Page(s) C8-239 - C8-242
DOI https://doi.org/10.1051/jp4:1996851
ICIFUAS 11
Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids

J. Phys. IV France 06 (1996) C8-239-C8-242

DOI: 10.1051/jp4:1996851

Phason Relaxation Mechanisms in Al-Pd-Mn Single-Quasicrystals

M. Weller1, M. Feuerbacher2, J. Diehl1 and K. Urban2

1  Max-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaft, Seestrasse 92, 70174 Stuttgart, Germany
2  Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany


Abstract
Quasicrystals represent a new state of condensed matter which exhibits long-range quasiperiodic translational order and orientational order with noncrystallographic symmetry. Mechanical spectroscopy was applied for the study of defect properties in stable icosahedral single-quasicrystalline Al-Pd-Mn samples. Two mechanical loss maxima appear at 360 K and 870 K for a measuring frequency of f≈3Hz. The relaxation parameters for both peaks were determined as H = 0.98 eV, τoo-1=4.5.1014s-1 for the low temperature peak, and H = 4.0 eV, τoo-1=3.0.1024s-1 for the high temperature peak, respectively. Both peaks are related to phason defects which are characteristic for the quasicrystalline structure.



© EDP Sciences 1996