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Ferroelectrics Volume 371, 2008 - Issue 1
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SECTION A: FERROELECTRICS, RELAXORS AND PIEZOELECTRICS

Study of Electroclinic Effect in Cholesterics Near a N∗-SmA-SmC∗ Multicritical Point by Dielectric Characterization

J. Hemine Laboratoire de Physique de la Matière Condensée, Université Hassan II, F.S.T., Mohammedia, BP 146, Morocco
,
A. Daoudi Laboratoire de Thermophysique de la Matière Condensée, Equipe de l'UMR-CNRS 8024, Université du Littoral-Côte d'Opale, 145, Avenue Maurice Schumann, Dunkerque, 59 140, France
,
M. Idali Oumhand Laboratoire de Physique de la Matière Condensée, Université Hassan II, F.S.T., Mohammedia, BP 146, Morocco
,
M. Zazoui Laboratoire de Physique de la Matière Condensée, Université Hassan II, F.S.T., Mohammedia, BP 146, Morocco
,
C. Legrand Laboratoire d'Etude des Matériaux et des Composants pour l'Electronique, EA 2601, Université du Littoral-Côte d'Opale, BP 717, Calais, France
,
N. Isaert Laboratoire de Dynamique et Structures des Matériaux Moléculaires, Université de Lille 1, UMR CNRS n° 8024, 59655, Villeneuve d'Ascq, France
&
H. T. Nguyen Centre de Recherche Paul Pascal, Université de Bordeaux 1, 33600, Pessac, France
 show all
Pages 98-103 | Accepted 24 May 2008, Published online: 20 Sep 2010
 
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Abstract

Ferroelectric liquid crystal (FLC) materials exhibiting the cholesteric (N∗), smectic A (SmA) and chiral smectic C (SmC∗) phases have been studied by electro-optical and dielectric investigations. In the dielectric measurements, we have studied the soft mode in the SmC∗ and SmA phases. From experimental data, we have evaluated the soft mode rotational viscosity and the electroclinic coefficient in the SmA phase. All results are discussed and compared with previous studies performed on other homologues of the same series. The main result is that the relaxation process, observed in N∗ phase for the C8, C10 and C11 materials and identified as a soft-mode-like mechanism, disappears for C12.

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