Dielectric properties of antiferroelectric liquid-crystalline mixtures

F. Goc; Wojciech Kuczynski; J. Malecki; Roman S. Dabrowski; Jerzy Hoffmann

doi:10.1117/12.373703

14 December 1999 Dielectric properties of antiferroelectric liquid-crystalline mixtures

F. Goc, Wojciech Kuczynski, J. Malecki, Roman S. Dabrowski, Jerzy Hoffmann

Proceedings Volume 4017, Polymers and Liquid Crystals; (1999) https://doi.org/10.1117/12.373703
Event: International Conference on Dielectric and Related Phenomena '98, 1998, Szczyrk, Poland

Abstract

Antiferroelectric liquid crystalline mixtures having smectic C_A^* 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 C_A^* 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.

Citation Download Citation

F. Goc, Wojciech Kuczynski, J. Malecki, Roman S. Dabrowski, and Jerzy Hoffmann "Dielectric properties of antiferroelectric liquid-crystalline mixtures", Proc. SPIE 4017, Polymers and Liquid Crystals, (14 December 1999); https://doi.org/10.1117/12.373703

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