Observation of SmC(alpha)* by dielectric measurements

Jolanta Rutkowska; Pawel Perkowski; Jerzy Kedzierski; Zbigniew Raszewski; Stanislaw J. Klosowicz; Roman S. Dabrowski; Krzysztof L. Czuprynski

doi:10.1117/12.472146

27 June 2002 Observation of SmC_α* by dielectric measurements

Jolanta Rutkowska, Pawel Perkowski, Jerzy Kedzierski, Zbigniew Raszewski, Stanislaw J. Klosowicz, Roman S. Dabrowski, Krzysztof L. Czuprynski

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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 f_R and the inverse dielectric strength 1/Δε_{(perpendicular}) obtained by fitting experimental values ε' and ε" to Cole-Cole equation, the SmC_(α )* (in the narrow temperature regions) is detected due to the change of the slope. The relaxation process observed in the SmC_(α )* phase is strongly modified under bias, thus it is probably connected with the helicity of SmC_(α )* 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, and Krzysztof L. Czuprynski "Observation of SmC_α* by dielectric measurements", Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); https://doi.org/10.1117/12.472146

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