27 June 2002 Observation of SmCα* by dielectric measurements
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Proceedings Volume 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications; (2002) https://doi.org/10.1117/12.472146
Event: XIV Conference on Liquid Crystals, Chemistry, Physics, and Applications, 2001, Zakopane, Poland
Abstract
The aim of our work was precise dielectric permittivity measurements of compound: (See paper for formula) Results of spontaneous polarization, tilt angle in the SmC* phase and first dielectric permittivity measurements of all phases of this compound were presented by us. The phase transition to SmC* phase is characterized by strong maximum for low frequencies and minimum for high frequencies of dielectric responses. Thus in 118 degree(s)C for our compound one can see phase transition to SmC* phase2. From the linear temperature dependences of relaxation frequency fR and the inverse dielectric strength 1/Δε(perpendicular) obtained by fitting experimental values ε' and ε" to Cole-Cole equation, the SmC )* (in the narrow temperature regions) is detected due to the change of the slope. The relaxation process observed in the SmC )* phase is strongly modified under bias, thus it is probably connected with the helicity of SmC )* e.g. ferroelectric-like structure of this phase.
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Jolanta Rutkowska, Pawel Perkowski, Jerzy Kedzierski, Zbigniew Raszewski, Stanislaw J. Klosowicz, Roman S. Dabrowski, Krzysztof L. Czuprynski, "Observation of SmCα* by dielectric measurements", Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); doi: 10.1117/12.472146; https://doi.org/10.1117/12.472146
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