Dielectric and ultrasonic measurements have been performed in the temperature and in the frequency domain to investigate the a (or primary) relaxation in the supercooled state of a <<fragile>> molecular liquid. This relaxation is strictly connected with the phenomenon of the glass transition and therefore an understanding of the former is a prerequisite for the explanation of the latter. The dynamic susceptibilities relative to these probes have been analysed with the Cole-Davidson function employing (where required) a Vogel-Fulcher-Tamman law to relate the main relaxation time to temperature. The results obtained are consistent with the dynamic behaviour of liquids of high fragility.
The primary-relaxation process in a supercooled liquid
CUTRONI, Maria;MANDANICI, Andrea;PICCOLO, Antonio;
1994-01-01
Abstract
Dielectric and ultrasonic measurements have been performed in the temperature and in the frequency domain to investigate the a (or primary) relaxation in the supercooled state of a <Pubblicazioni consigliate
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