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Proceedings Paper

Dielectric properties of liquid-crystalline S-MHPOBC in the low-frequency range
Author(s): Krzysztof Wojciechowski; Agnieszka L. Gromiec; Grzegorz W. Bak
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Paper Abstract

Collective motions of molecules in a ferroelectric liquid crystal have been investigated using broadband dielectric spectroscopy. S-MHPOBC is a smectic liquid crystal with antiferroelectric and ferroelectric phases. In those phases (epsilon) ' and (epsilon) ' were measured in the frequency range 10-2 divided by 5*104 Hz. Two dielectric loss peaks were detected. The low-frequency peak has its maximum at about 0.1 Hz and is caused by Maxwell-Wagner relaxations. Goldstone mode is responsible for the second high-frequency loss peak. Both peaks may be well described by Havriliak- Negami equation. The changes of Havriliak-Nagami parameters (alpha) and (alpha) (beta) well correspond to the phase transitions detected in S-MHPOBC.

Paper Details

Date Published: 14 December 1999
PDF: 5 pages
Proc. SPIE 4017, Polymers and Liquid Crystals, (14 December 1999); doi: 10.1117/12.373702
Show Author Affiliations
Krzysztof Wojciechowski, Technical Univ. of Lodz (Poland)
Agnieszka L. Gromiec, Technical Univ. of Lodz (Poland)
Grzegorz W. Bak, Technical Univ. of Lodz (Poland)

Published in SPIE Proceedings Vol. 4017:
Polymers and Liquid Crystals
Andrzej Wlochowicz, Editor(s)

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