Electro-optic and dynamic studies of biphenyl benzoate ferroelectric liquid crystals
Autor: | A. El kaaouachi, N. Isaert, M. Ismaili, C. Legrand, J. Hemine, A. Daoudi, H.T. Nguyen, Abdelhakim Nafidi |
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Rok vydání: | 2010 |
Předmět: |
Biphenyl
Materials science Relaxation (NMR) Dielectric Condensed Matter Physics Ferroelectricity Molecular physics Electronic Optical and Magnetic Materials Dielectric spectroscopy chemistry.chemical_compound Nuclear magnetic resonance chemistry Liquid crystal Phase (matter) Rotational viscosity Electrical and Electronic Engineering |
Zdroj: | Physica B: Condensed Matter. 405:2151-2156 |
ISSN: | 0921-4526 |
DOI: | 10.1016/j.physb.2010.01.124 |
Popis: | We present electro-optic and dynamic properties on three homologous of biphenyl benzoate series of ferroelectric liquid crystals (FLCs) exhibiting the chiral smectic C phase (SmC*). The three compounds present high spontaneous polarization and show the SmC*–SmA*–N* phase sequence. Dielectric spectroscopy was used to provide the dynamics and dipolar ordering of the ferroelectric phase. The Goldstone relaxation mode was studied for sample cells on planar geometry without a DC bias voltage. The rotational viscosity corresponding to molecular motions in the SmC* phase was determined from dielectric measurements. The Arrhenius-type behavior of the rotational viscosity was found and the corresponding activation energies were evaluated. |
Databáze: | OpenAIRE |
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