Dielectric properties of liquid-crystalline S-MHPOBC in the low-frequency range

Krzysztof Wojciechowski; Agnieszka L. Gromiec; Grzegorz W. Bak

doi:10.1117/12.373702

14 December 1999 Dielectric properties of liquid-crystalline S-MHPOBC in the low-frequency range

Krzysztof Wojciechowski, Agnieszka L. Gromiec, Grzegorz W. Bak

Proceedings Volume 4017, Polymers and Liquid Crystals; (1999) https://doi.org/10.1117/12.373702
Event: International Conference on Dielectric and Related Phenomena '98, 1998, Szczyrk, Poland

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.

Citation Download Citation

Krzysztof Wojciechowski, Agnieszka L. Gromiec, and Grzegorz W. Bak "Dielectric properties of liquid-crystalline S-MHPOBC in the low-frequency range", Proc. SPIE 4017, Polymers and Liquid Crystals, (14 December 1999); https://doi.org/10.1117/12.373702

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