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Proceedings Paper

Dielectric properties of antiferroelectric liquid-crystalline mixtures
Author(s): F. Goc; Wojciech Kuczynski; J. Malecki; Roman S. Dabrowski; Jerzy Hoffmann
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Paper Abstract

Antiferroelectric liquid crystalline mixtures having smectic CA* phase in very broad temperature range have been investigated. Measurements of dielectric relaxation and spontaneous polarization were performed. Two absorption peaks in the existence range of the antiferroelectric CA* phase in the kHz-MHz range of frequency were observed. Both peaks are quite weak and of Debye type. Their characteristic dielectric strengths are almost temperature independent. The peaks are probably related to the motions of molecules on the side of a cone, defined by the molecule tilt angle, the slower process is related to the motions of molecules, tilted in opposite directions in subsequent layers and moving in the same direction. The process with shorter relaxation time is attributed to the movement of molecules in opposite directions. Both modes are active in dielectric measurements due to small residual polarization being a consequence of the helical superstructure.

Paper Details

Date Published: 14 December 1999
PDF: 4 pages
Proc. SPIE 4017, Polymers and Liquid Crystals, (14 December 1999); doi: 10.1117/12.373703
Show Author Affiliations
F. Goc, Institute of Molecular Physics (Poland)
Wojciech Kuczynski, Institute of Molecular Physics (Poland)
J. Malecki, Institute of Molecular Physics (Poland)
Roman S. Dabrowski, Military Academy of Technology (Poland)
Jerzy Hoffmann, Institute of Molecular Physics (Poland)

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

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