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Collective and antiferroelectric dielectric modes in a highly tilted three‐ring ester
- Source :
- Liquid Crystals. 34:519-526
- Publication Year :
- 2007
- Publisher :
- Informa UK Limited, 2007.
-
Abstract
- Broadband dielectric spectroscopy was applied to investigate a newly synthesized antiferroelectric liquid crystal, (S)‐(+)‐4′‐(1‐methylheptyloxycarbonyl)biphenyl‐4‐yl 4‐(6‐heptanoyloxyhex‐1‐oxy)benzoate. Near the SmA–SmC* phase transition the soft and the Goldstone modes are observed. The temperature dependence of the soft mode dielectric strength follows the Cure–Weiss law. In a narrow range of temperature the collective and antiferroelectric relaxation modes coexist as a result of the competition between ferroelectric and antiferroelectric order in the successive smectic layers. In the antiferroelectric phase the low frequency, PL, and high frequency, PH, modes appear, which can be related to the in‐phase and anti‐phase azimuthal angle fluctuations of the director, respectively. The relaxation frequency of the PH and PL modes decreases linearly with decreasing temperature and satisfies the Arrhenius law. Some parameters involved in the extended Landau model of the SmA–SmC* phase transition could be obta...
- Subjects :
- Phase transition
Materials science
Condensed matter physics
General Chemistry
Dielectric
Soft modes
Condensed Matter Physics
Ferroelectricity
Condensed Matter::Soft Condensed Matter
Condensed Matter::Materials Science
Nuclear magnetic resonance
Liquid crystal
Phase (matter)
Relaxation (physics)
Antiferroelectricity
General Materials Science
Subjects
Details
- ISSN :
- 13665855 and 02678292
- Volume :
- 34
- Database :
- OpenAIRE
- Journal :
- Liquid Crystals
- Accession number :
- edsair.doi...........4d3c6c97652233997d7f11eaaafab36a