Collective and molecular relaxation in ferroelectric liquid crystals

S. Wrobel; M. Marzec; Malgorzata Godlewska; B. Gestblom; Steffen Hiller; Wolfgang Haase

doi:10.1117/12.215535

2 August 1995 Collective and molecular relaxation in ferroelectric liquid crystals

S. Wrobel, M. Marzec, Malgorzata Godlewska, B. Gestblom, Steffen Hiller, Wolfgang Haase

Proceedings Volume 2372, Liquid Crystals: Materials Science and Applications; (1995) https://doi.org/10.1117/12.215535
Event: Liquid Crystals: Materials Science and Applications, 1994, Zakopane, Poland

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 T_C 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.

Citation Download Citation

S. Wrobel, M. Marzec, Malgorzata Godlewska, B. Gestblom, Steffen Hiller, and Wolfgang Haase "Collective and molecular relaxation in ferroelectric liquid crystals", Proc. SPIE 2372, Liquid Crystals: Materials Science and Applications, (2 August 1995); https://doi.org/10.1117/12.215535

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