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Proceedings Paper

At the borderline between "classic" and B phases
Author(s): Hans Kresse; Heiko Schmalfuss; Wolfgang Weissflog
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Paper Abstract

Dielectric results of three bent shaped compounds are presented. An increase of the static dielectric constant in the isotropic phase by approaching the I-B2 transition is seen in the first sample. The second sample shows the polymorphism I-SmA-SmC-B2. Down to the SmC phase only the reorientation about the long molecular axis without a step in the relaxation time is observed. In the B2 phase an additional low frequency relaxation is detected resulting from the antiferroelectric structure. The interesting feature is the increase of the dielectric increment (Delta) 2 of the high frequency mechanism with decreasing temperature: Starting from about 2.5 in the SmA phase (Delta) 2 increases continuously and reaches at the transition into the B2 phase values of about 40. This result points to the step by step increase of the ferroelectric short range order within the SmA and specially the SmC phases. The last sample confirms this result for the polymorphism I-SmA-CPA, with one exception the low frequency process is missing.

Paper Details

Date Published: 27 June 2002
PDF: 7 pages
Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); doi: 10.1117/12.472150
Show Author Affiliations
Hans Kresse, Martin-Luther-Univ. Halle-Wittenberg (Germany)
Heiko Schmalfuss, Martin-Luther-Univ. Halle-Wittenberg (Germany)
Wolfgang Weissflog, Martin-Luther-Univ. Halle-Wittenberg (Germany)

Published in SPIE Proceedings Vol. 4759:
XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications
Jolanta Rutkowska; Stanislaw J. Klosowicz; Jerzy Zielinski, Editor(s)

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