DIELECTRIC STUDY OF COLLECTIVE AND MOLECULAR-DYNAMICS IN A GLASS-FORMING LOW-MOLECULAR-MASS FERROELECTRIC LIQUID-CRYSTAL AND ITS RACEMIC-MIXTURE

Authors
PALACIOS B DELAFUENTE MR JUBINDO MAP ROS MB
Citation
B. Palacios et al., DIELECTRIC STUDY OF COLLECTIVE AND MOLECULAR-DYNAMICS IN A GLASS-FORMING LOW-MOLECULAR-MASS FERROELECTRIC LIQUID-CRYSTAL AND ITS RACEMIC-MIXTURE, Liquid crystals, 23(3), 1997, pp. 349-355
Citations number
14
Categorie Soggetti
Crystallography
Journal title
Liquid crystals → ACNP
ISSN journal
02678292
Volume
23
Issue
3
Year of publication
1997
Pages
349 - 355
Database
ISI
SICI code
0267-8292(1997)23:3<349:DSOCAM>2.0.ZU;2-K
Abstract
The dynamics of a low molecular mass ferroelectric liquid crystal that can be frozen into a glassy state has been studied by means of broadb and dielectric spectroscopy covering a wide time scale range from 10(- 10) to 10 s. Both the optically active compound and the racemic mixtur e have been studied. The temperature dependence of the relaxation freq uency of the Goldstone mode, related to azimuthal fluctuations of the director, follows the Vogel-Fulcher-Tammann law. The frequencies of th e modes associated with the overall motions of the molecules also show this behaviour. A high frequency Arrhenius-like mechanism was also ob served.