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Proceedings Paper

Collective and molecular relaxation in ferroelectric liquid crystals
Author(s): S. Wrobel; M. Marzec; Malgorzata Godlewska; B. Gestblom; Steffen Hiller; Wolfgang Haase
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Paper Abstract

Ferroelectric liquid crystals are molecular ferroelectrics showing up in the tilted liquid crystalline systems (SmC*, SmI*, SmF*) composed of chiral molecules. In this work, we present the dielectric, electro-optic, and calorimetric studies of a single component system: 3-octyloxy-6[2-fluor-4-(2-fluoroctyloxy)phenyl]-pyridine showing interesting ferroelectric properties. The compound exhibits a first order N*- SmC* phase transition which leads to a qualitatively new behavior, for instance the relaxation frequency of the soft mode below TC seems to be temperature independent. The high frequency relaxation process, connected with the reorientation around the long axis, is practically undisturbed at the N*-SmC* transition. Yet, it was found that in the SmC* phase, the best fit was obatined with two Cole-Cole functions yielding two relaxation times to describe a biased reorientation of molecules in the SmC* phase.

Paper Details

Date Published: 2 August 1995
PDF: 7 pages
Proc. SPIE 2372, Liquid Crystals: Materials Science and Applications, (2 August 1995); doi: 10.1117/12.215535
Show Author Affiliations
S. Wrobel, Jagellonian Univ. (Poland)
M. Marzec, Jagellonian Univ. (Poland)
Malgorzata Godlewska, Jagellonian Univ. (Poland)
B. Gestblom, Univ. of Uppsala (Sweden)
Steffen Hiller, Institut fuer Physikalische Chemie (Germany)
Wolfgang Haase, Institut fuer Physikalische Chemie (Germany)

Published in SPIE Proceedings Vol. 2372:
Liquid Crystals: Materials Science and Applications
Jozef Zmija, Editor(s)

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