MULTIPLE RELAXATION PHENOMENA IN THE LOW-FREQUENCY DIELECTRIC SPECTRUM OF SMECTIC POLYMORPHS

被引：16
|
作者：
RANI, GP
POTUKUCHI, DM
RAO, NVS
PISIPATI, VGKM
机构：
[1] Centre for Liquid Crystal Research and Education, Faculty of Physical Sciences, Nagarjuna University, Nagarjunanagar
来源：
SOLID STATE COMMUNICATIONS | 1994年 / 92卷 / 04期
关键词：
LIQUID CRYSTALS; DIELECTRIC RESPONSE; PHASE TRANSITIONS;
D O I：
10.1016/0038-1098(94)90715-3
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Dielectric investigations are carried out in the thermotropic liquid crystal, N(rho-n-decyloxybenzylidene)rho-n-octylaniline in the radio frequency range (10 kHz-6 MHz) with the electric field parallel to the director. For the first time, the Cole-Davidson resolved spectrum exhibits a non-Debye type of multiple relaxation phenomena in Smectic-A (SA), smectic-C (SC) and smectic-F (SF) polymorphs. The observed multiple relaxation phenomena reveals the underlying molecular mechanism tuned by the distinct orientational longitudinal dipole motions associated with flexible end chains and central rigid core of the liquid crystal molecule. The estimated activation energies in SA and SC phases are discussed in the light of the available data.
引用
收藏
页码：349 / 352
页数：4
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