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On the temperature dependence of the tilt and spontaneous polarization in high tilt antiferroelectric liquid crystals.
Gleeson, Helen F.; Wang, Ying; Watson, Samantha; Sahagun-Sanchez, Daniel; Goodby, John W.; Hird, Michael; Petrenko, Alex; Osipov, Mikhail A
Journal of Materials Chemistry. 2004;14:1480-1485.
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Abstract
The temp.-dependent phys. properties of four related liq. cryst. materials are reported. The materials differ chem. only in the degree of fluorination of one of the core arom. rings and all materials exhibit both chiral smectic-C (ferroelec.) and antiferroelec. liq. crystal phases. The steric tilt angles, calcd. from the layer spacing, are relatively low, satg. at a max. of 25 Deg, while the optical tilt angles are much higher, achieving values of 42.5 Deg. Most obviously, the tilt angle and spontaneous polarization exhibit very different temp. dependencies, the former appearing to be discontinuous at the orthogonal to tilted transition, while the latter follows a simple power law. This behavior was obsd. in other similar materials, but it is not in agreement with the simple coupling between spontaneous polarization and tilt that is often assumed in ferroelec. liq. crystals. A theor. explanation is given for the different temp. dependence of these two phys. quantities, suggesting that the biaxial order parameter, not directly detd. by the tilt angle, is important in these systems. [on SciFinder (R)]
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