Dielectric investigation of the liquid crystal compound with the directSmA*-SmCA* phase transition

被引：8
作者：
Perkowski, P. [1 ]
Mrukiewicz, M. [1 ]
Herman, J. [1 ]
Kula, P. [1 ]
Jaroszewicz, L. [1 ]
机构：
[1] Mil Univ Technol, Fac Adv Technol & Chem, Warsaw, Poland
来源：
LIQUID CRYSTALS | 2016年 / 43卷 / 05期
关键词：
antiferroelectic liquid crystal; dielectric spectroscopy; Goldstone mode; relaxation frequency; Cole-Cole model; Soft mode; RELAXATION PROCESSES; ELECTROOPTIC SPECTROSCOPY; MOLECULAR CORE; BEHAVIOR; ELECTRODES; MIXTURES; MODEL;
D O I：
10.1080/02678292.2015.1133849
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
New compound showing a direct SmA*-SmCA* phase transition was synthesised. As far as authors know there are a few pure compounds showing para- and antiferroelectric phases without SmC* between them. Direct current (DC) field applied into a planar-oriented cell induces ferroelectric SmC* phase in an investigated compound. Typical for SmC*, Goldstone mode starts to be detectable. DC field also shifts down the temperature of a SmCA* phase creation. Moreover, modes in the appearing antiferroelectic phase are enhanced by DC field. This paper shows and discusses relations between modes detected in SmA*, SmCA* and SmC* (SmC* phase - nucleated by DC field) phases. Parameters of observed modes are calculated using the Cole-Cole relaxation model and a calculation procedure useful especially for high frequency relaxations (higher than 200 kHz).
引用
收藏
页码：654 / 663
页数：10
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