Volume 89, Number 1, January 2010
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||05 January 2010|
Double-peak polarization current response in the unusual SmA* phase of a fluorinated high-tilt antiferroelectric liquid crystal
Department of Spectroscopy, Indian Association for the Cultivation of Science - Jadavpur, Kolkata-700032, India
2 Department of Physics, University of Kalyani - Kalyani-741235, West Bengal, India
3 Institute of Chemistry, Military University of Technology - 00-908 Warsaw, Poland, EU
Corresponding author: email@example.com
Accepted: 3 December 2009
A detailed investigation of the dielectric, electro-optical properties and X-ray studies have been made in the vicinity of the transition from Smectic-A* to Smectic-C* as well as in the Smectic-A* phase of a newly synthesized partially fluorinated high-tilt antiferroelectric liquid crystal (AFLC) material. The Smectic-A* phase of this material exhibits high optical tilt, minimum layer shrinkage from paraelectric-to-ferroelectric phase transition and unusual dielectric behavior, which are the complementary evidences that the Smectic-A* phase is of de Vries type. Double-peak polarization current response and tristable-optical-switching studies have revealed an antiferroelectric molecular ordering in the de Vries SmA* phase of this material. Two distinct dielectric relaxation peaks in the SmA* phase also complement the antiferroelectric-like ordering of the molecule in the SmA* phase. The material undergoes a first-order SmA*-SmC* transition which is confirmed by a high enthalpy change and the discontinuity of the dielectric parameters at the phase transition.
PACS: 61.30.-v – Liquid crystals / 77.84.-s – Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials / 61.05.C- – X-ray diffraction and scattering
© EPLA, 2010
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