Dielectric and thermodynamic studies of Smectic-A-Smectic-C* phase transition in antiferroelectric liquid crystal: thermal hysteresis

被引：3
|
作者：
Soltani, T. [1 ]
Chmingui, M. [1 ]
Marcerou, J. P. [2 ]
Othman, T. [1 ]
机构：
[1] Univ Elmanar, Fac Sci Tunis, Lab Phys Matiere Molle, Tunis, Tunisia
[2] Ctr Rech Paul Pascal, F-33600 Pessac, France
来源：
LIQUID CRYSTALS | 2014年 / 41卷 / 02期
关键词：
liquid crystal; phase transition; thermal hysteresis; dielectric measurements; BEHAVIOR; FIELD;
D O I：
10.1080/02678292.2013.851286
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We present the experimental evidence and theoretical studies of the para-ferroelectric phase transition in the chiral liquid crystal C12HH. The investigated compound presents a large SmC* range. Both microscopic observation and dielectric measurements show thermal hysteresis and coexistence phases at paraelectric (SmA)-ferroelectric (SmC*) phase transition. The thermal hysteresis is analysed in samples with different planar cell thickness. The SmA-SmC* phase transition under electric field is also investigated. Finally, the Landau free energy density is used to analyse the experimental measurements, showing a satisfactory agreement with experimental data.
引用
收藏
页码：222 / 227
页数：6
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