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Proceedings Paper

Dielectric properties of ferroelectric liquid crystals with lateral group in the core
Author(s): Alexej M. Bubnov; Milada Glogarova; Vera Hamplova; Miroslav Kaspar
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Paper Abstract

Two series of ferroelectric liquid crystalline materials, non-substituted and containing a methoxy lateral group at the aromatic ring of the molecular core have been investigated by dielectric relaxation spectroscopy in the range from 1 Hz to 1 MHz. All compounds exhibit chiral SmC* phase. A low temperature ferroelectric phase, consisting of the ordinary SmC* phase and a crystalline phase, was detected in three of the investigated compounds. The frequency dispersion reveals two modes (denoted as mode 1 and mode 2) detected in both ferroelectric phases. The analysis of the frequency dispersion of the complex permittivity provides relaxation frequency and dielectric strength of these modes. In the SmC* phase, high frequency mode 1 is the Goldstone mode. Low frequency mode 2 is attributed to a non-homogenous distribution of ionic space charge, which is localized near the surfaces. The values of Ps in the low temperature ferroelectric phase are lower than in the ordinary SmC* phase for the methoxy substituted compounds but shows no anomaly for the non-substituted material.

Paper Details

Date Published: 27 June 2002
PDF: 6 pages
Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); doi: 10.1117/12.472138
Show Author Affiliations
Alexej M. Bubnov, Institute of Physics (Czech Republic)
Milada Glogarova, Institute of Physics (Czech Republic)
Vera Hamplova, Institute of Physics (Czech Republic)
Miroslav Kaspar, Institute of Physics (Czech Republic)

Published in SPIE Proceedings Vol. 4759:
XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications

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