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

页码：222 / 227

页数：6

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