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

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

中国物理B ›› 2016, Vol. 25 ›› Issue (5): 57704-057704.doi: 10.1088/1674-1056/25/5/057704

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

H Dhaouadi, R Zgueb, O Riahi, F Trabelsi, T Othman

Département de physiqu, Faculté des Sciences de Tunis, Laboratoire de physique de la matiére molle et de modélisation électromagnétique (LP3ME), Université Tunis Elmanar Campus universitaire 2092, Tunis, Tunisia

收稿日期:2015-11-12 修回日期:2016-01-07 出版日期:2016-05-05 发布日期:2016-05-05
通讯作者: H Dhaouadi E-mail:hassen.dhaouadi@ipeit.rnu.tn

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

H Dhaouadi, R Zgueb, O Riahi, F Trabelsi, T Othman

Département de physiqu, Faculté des Sciences de Tunis, Laboratoire de physique de la matiére molle et de modélisation électromagnétique (LP3ME), Université Tunis Elmanar Campus universitaire 2092, Tunis, Tunisia

Received:2015-11-12 Revised:2016-01-07 Online:2016-05-05 Published:2016-05-05
Contact: H Dhaouadi E-mail:hassen.dhaouadi@ipeit.rnu.tn

摘要/Abstract

摘要： 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.

关键词: chiral smectic liquid crystal, constant current method, ferroelectric polarization dielectric permittivity

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.

Key words: chiral smectic liquid crystal, constant current method, ferroelectric polarization dielectric permittivity

中图分类号: (Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)

77.84.-s

77.80.-e (Ferroelectricity and antiferroelectricity) 77.80.B- (Phase transitions and Curie point)

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[J]. 中国物理B, 2016, 25(5): 57704-057704.

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[J]. Chin. Phys. B, 2016, 25(5): 57704-057704.

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

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

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