A study of a ferroelectric organosiloxane liquid crystal with a high spontaneous polarisation

被引：0
|
作者：
Shtykov, N. M. [1 ]
Panov, V. P. [2 ]
Vij, J. K. [2 ]
Naciri, J. [3 ]
机构：
[1] Russian Acad Sci, AV Shubnikov Crystallog Inst, Moscow, Russia
[2] Univ Dublin, Trinity Coll, Dept Elect & Elect Engn, Dublin, Ireland
[3] USN, Res Lab, Ctr Biomol Sci & Engn, Washington, DC 20375 USA
来源：
LIQUID CRYSTALS | 2011年 / 38卷 / 05期
基金：
爱尔兰科学基金会;
关键词：
ferroelectric liquid crystals; electroclinic effect; pyroelectric coefficient; smectic layer shrinkage; de Vries materials; dielectric permittivity; freestanding films; SMECTIC-C; TILT ANGLE; PHASES; TRANSITIONS; FIELD;
D O I：
10.1080/02678292.2011.555885
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The dielectric permittivity, the pyroelectric coefficient and the smectic layer thickness of a novel ferroelectric organosiloxane liquid crystalline material 12KN5DSi were measured as functions of the temperature and the bias electric field in the orthogonal and tilted phases of the material. It was found that this material has a very high spontaneous polarisation (similar to 240 nC/cm(2)) in the smectic C* (SmC*) phase and also demonstrates an unusual behaviour of the pyroelectric coefficient and the smectic layer thickness in a temperature range just below the phase transition from the smectic A* (SmA*) phase. This unusual behaviour is interpreted in terms of the new statistical theory based on order parameters of the SmC* phase.
引用
收藏
页码：521 / 529
页数：9
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