Field-induced phase transitions in chiral smectic liquid crystals studied by the constant current method

doi:10.1088/1674-1056/25/5/057704

Abstract In ferroelectric liquid crystals, phase transitions can be induced by an electric field. The current constant method allows these transition to be quickly localized and thus the (E,T) phase diagram of the studied product can be obtained. In this work, we make a slight modification to the measurement principles based on this method. This modification allows the characteristic parameters of ferroelectric liquid crystal to be quantitatively measured. The use of a current square signal highlights a phenomenon of ferroelectric hysteresis with remnant polarization at null field, which points out an effect of memory in this compound.

Keywords: chiral smectic liquid crystal constant current method ferroelectric polarization dielectric permittivity

Received: 12 November 2015
Revised: 07 January 2016
Accepted manuscript online:

PACS:	77.84.-s	(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
	77.80.-e	(Ferroelectricity and antiferroelectricity)
	77.80.B-	(Phase transitions and Curie point)

Corresponding Authors: H Dhaouadi
E-mail: hassen.dhaouadi@ipeit.rnu.tn

Cite this article:

H Dhaouadi, R Zgueb, O Riahi, F Trabelsi, T Othman Field-induced phase transitions in chiral smectic liquid crystals studied by the constant current method 2016 Chin. Phys. B 25 057704

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Field-induced phase transitions in chiral smectic liquid crystals studied by the constant current method

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