Abstract
ABSTRACT In the present work the dielectric relaxation related to non-collective motion of liquid crystal molecules has beenstudied. In the first place we observe the relaxation around the short axis (usually observed at few tens of kHz) for achoice of ferroelectric and antiferroelectric materials. Additionally, for sorne materials the non-collective motion amundthe long axis has been investigated. We found that for all investigated compounds, except one, the relaxations obey anArrhenius law f = f0 exp(-EaIkT) and we were able to map the activation energy changes between different smecticphases.The changes of the activation energy E are related to the parallel correlation between the molecules. For most of theinvestigated ferroelectric materials we observed that the correlation increases both along the long and short molecularaxes at the phase transition to the smectic Ck phase. For antiferroelectric materials the parallel correlation along the longaxis weakens in the smectic Ca* phase. It thus seems that antitilt layer structure is related to the low degree of molecularcorrelation.Keywords: Ferroelectric liquid crystals, antiferroelectric liquid crystals, dielectric relaxation spectroscopy, non-collectiverelaxations, activation energy, order parameter.
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