Eur. Phys. J. E 1, 137-140
Phase transitions between orthogonal and tilted hexatic phases
D. Pociecha1 - E. Gorecka1 - J. Przedmojski2
1 Laboratory of Dielectrics and Magnetics, Department of Chemistry, Warsaw
University, Al. Zwirki i Wigury 101,
02-089 Warsaw, Poland
2 Department of Physics, Warsaw Technical University, ul. Koszykowa 75,
00-662 Warsaw, Poland
pociu@chem.uw.edu.pl
Received 21 June 1999
Abstract
Tilt-driven phase transitions between hexatic smectic phases: SmF-HexB and
reversed HexB-SmF have been studied in compounds belonging to two
enaminoketone derivative homologue series. The tilt angle order parameter has been
measured and its temperature dependence near the phase transition point has been
described by applying mean-field model. For both phase sequences the tricritical
points have been observed on phase transition lines in binary mixtures of respective
materials having first and second order phase transitions between hexatic phases.
PACS
64.70.Md Transitions in liquid crystals
Copyright EDP Sciences, Società Italiana di Fisica, Springer-Verlag
