Room-temperature ferroelectric mixtures based on a chiral epoxy compound

M. Marzec; A. Wrobel; S. Wrobel; Wolfgang Haase; Roman S. Dabrowski

doi:10.1117/12.299948

1 February 1998 Room-temperature ferroelectric mixtures based on a chiral epoxy compound

M. Marzec, A. Wrobel, S. Wrobel, Wolfgang Haase, Roman S. Dabrowski

Proceedings Volume 3318, Liquid Crystals: Physics, Technology, and Applications; (1998) https://doi.org/10.1117/12.299948
Event: Liquid Crystals, 1997, Zakopane, Poland

Abstract

Two mixtures: W-90 and W-91 containing an epoxy compound as a chiral dopant have been studied using dielectric and electrooptic methods. W-90 mixture shows a phase sequence Is-N^*-SmC^* whereas W-91 mixture - Is-N^*- SmA^*-SmC^*. One of the objectives of the paper was to study the transition order between ferroelectric and paraelectric phases. Dielectric spectra were measured using 10micrometers EHC cells. In SmC^* phases of both mixtures a broad Goldstone mode dielectric spectrum has been found. Switching properties of both mixtures have been studied by using LINKAM 5 micrometers thick cells. Tilt angle and spontaneous polarization have been measured in the SmC^* phase versus temperature. Dielectric and electrooptic data are discussed in terms of the mean field model.

Citation Download Citation

M. Marzec, A. Wrobel, S. Wrobel, Wolfgang Haase, and Roman S. Dabrowski "Room-temperature ferroelectric mixtures based on a chiral epoxy compound", Proc. SPIE 3318, Liquid Crystals: Physics, Technology, and Applications, (1 February 1998); https://doi.org/10.1117/12.299948

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