Electro-Optical and Dielectric Investigations of Antiferroelectric and Ferrielectric Smectic Phases

被引：2
作者：
Heppke, G. [1 ]
Loetzsch, D. [1 ]
Nolte-Boemelburg, J. [1 ]
Rauch, S. [1 ]
机构：
[1] Tech Univ Berlin, Iwan N Stranski Inst, Sekr ER11, D-10623 Berlin, Germany
来源：
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 1998年 / 317卷
关键词：
Antiferroelectric liquid crystals; SmC subphases; electro-optical studies; dielectric properties; antiferroelectricity; ferrielectricity;
D O I：
10.1080/10587259808047106
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
Dielectric and electro-optical properties of the various antiferroelectric and ferrielectric smectic phases of two compounds of the homologous series MHPnCBC (n = 8,9) have been investigated. MHP9CBC exhibits an unidentified chiral induced SmC subphase (denoted by SmCx*) and shows the phase sequence Cr - SmIA* - SmCA* - SmC gamma* - SmCx* - SmCx* - SmA - I. The electro-optical and dielectric properties of the SmC: phase of MHP9CBC differ distinctly from that of the SmC alpha* as well as the SmC gamma* phase. The electric field-temperature phase diagram was obtained by two methods, measurement of the apparent tilt angle as well as the dielectric loss. The results of both methods are in good agreement. For both compounds a field induced ferrielectric state is observed in a broad temperature range (approximate to 10 K) of the SmCA*-phase.
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页码：65 / 82
页数：18
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