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Experimental characterization of hexatic smectic phases through electro-optic studies and dielectric relaxation spectroscopy
Authors:S. Kundu   T. Ray  S. K. Roy  R. Dabrowski
Affiliation: a Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, Indiab Institute of Chemistry, Military University of Technology, 00-908 Warsaw, Poland
Abstract:The electro-optic and complex dielectric behaviour of an antiferroelectric liquid crystal 4-(1-methylheptyloxycarbonyl)phenyl 4'-(n-butanoyloxyprop-1-oxy)biphenyl-4-carboxylate, having chiral SmCA* and hexatic smectic phases, have been investigated. Complex dielectric permittivities were measured as a function of frequency, d.c. bias field and temperature. Spontaneous polarization was measured by the current reversal technique; tilt angle was measured under a polarizing microscope using a low frequency electric field. The electro-optic properties and dielectric behaviour of the material are compared with results obtained by DSC and polarizing optical microscopy. Dielectric relaxation processes in SmCA* and hexatic smectic phases were determined. The dielectric strength at the SmCA* to hexatic smectic phase transition is discussed in terms of coupling between the long range bond orientational order and smectic C director. It seems from the results of spontaneous polarization and dielectric relaxation spectroscopy that the material might possess an additional phase between the SmCA* and hexatic smectic I* phases.
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