| Numéro |
J. Phys. Colloques
Volume 42, Numéro C5, Octobre 1981
ICIFUAS-7Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C5-31 - C5-36 | |
| DOI | https://doi.org/10.1051/jphyscol:1981503 | |
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-31-C5-36
DOI: 10.1051/jphyscol:1981503
Institut für Festkörperphysik der Universität Wien, Boltzmanngasse 5, A-1090 Austria
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-31-C5-36
DOI: 10.1051/jphyscol:1981503
INTERNAL FRICTION IN THE ALKALI METALS
F. Hammerschmid, H.O.K. Kirchner et G. SchoeckInstitut für Festkörperphysik der Universität Wien, Boltzmanngasse 5, A-1090 Austria
Abstract
Internal friction measurements in the alkali metals show that in Potassium there exists a γ-peak around 50K at about 10 kHz. It is due to the double kink formation in screw dislocation and has an activation enthalpy of ƉH=0.046 ± 0.003 eV. In Sodium and Lithium which undergo low temperature phase transformations there is no evidence of a similar peak above their resp. transformation temperature. This suggests in Sodium and Lithium a different structure of screw dislocations.