Numéro
J. Phys. Colloques
Volume 42, Numéro C5, Octobre 1981
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
Page(s) C5-547 - C5-552
DOI https://doi.org/10.1051/jphyscol:1981583
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids

J. Phys. Colloques 42 (1981) C5-547-C5-552

DOI: 10.1051/jphyscol:1981583

ULTRASONIC ATTENUATION IN ICE CRYSTALS NEAR THE MELTING TEMPERATURE

Y. Hiki et J. Tamura

Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152, Japan


Abstract
Ultrasonic attenuation in crystals of ice Ih has been measured as functions of frequency (15 ~ 85 MHz) and temperature (- 8°C ~ - 0.1°C). Data were analyzed on the basis of vibrating string model of dislocation, and the following results have been obtained : Density of dislocations is on the order of 106 cm-2 ; pinning of dislocations may be due to impurity ions ; dislocation density severely fluctuates with time near the melting point.