Temperature and bias-field dependences of dielectric behaviour in the antiferroelectric liquid crystal, (R)-MHPOBC
作者:
J. HOU,
J. SCHACHT,
F. GIEssELMANN,
P. ZUGENMAIER,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 22,
issue 4
页码: 409-417
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997209126
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Temperature and bias-field dependences of dielectric behaviour in the antiferroelectric liquid crystal, R-MHPOBC, were investigated (see also previous paper). There are mainly two relaxation modes in the SmC*alpha and SmC* phases: one behaves as the soft-mode, which shows significant slowing down in the SmA* and SmC*alpha phases; the other one appears at lower frequencies and changes the dielectric strength remarkably, especially in the SmC* phase, which is considered to relate to the azimuthal phase-fluctuation of molecules in the parallel tilt sequences of the smectic layers. These two modes show different bias field dependences in different C* subphases. In the SmC*A phase, two other types of relaxation mode were observed, which are probably due to the in-phase and anti-phase azimuthal angle fluctuations of molecules in the anti-tilt pairs.
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