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
Rok vydání: 2010
Předmět:
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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