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Soft mode dielectric relaxation under the influence of bias electric field of a ferroelectric liquid crystal mixture.

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Roy, SS, Majumder, TP and Roy, SK (1997) Soft mode dielectric relaxation under the influence of bias electric field of a ferroelectric liquid crystal mixture. MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 304 . pp. 315-320. [Journal article]

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Abstract

Temperature dependent soft mode part of the complex dielectric constant has been measured as a function of bias electric field both in the smectic C* and smectic A* phases for a ferroelectric liquid crystal (FLC) mixture. From the experimental data, soft mode relaxation frequency and dielectric strength have been determined both in smectic C* and smectic A* phases. In smectic B* phase, relaxation frequency and inverse of dielectric strength of the FLC mixture does not follow the Curie-Weiss law. The critical exponent for the studied FLC mixture is 1.43. Dielectric results shows a dependence of soft mode dielectric strength and relaxation frequency with bias field near the transition temperature in smectic A* phase to an extent of 1 degrees C above the transition temperature and above 1 degrees C bias field does not have any effect on relaxation frequency and dielectric strength It is observed that relaxation frequency increases with increasing bias held while the corresponding dielectric strength decreases.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:14092
Deposited By:Dr Susanta Sinha Roy
Deposited On:07 Jun 2010 15:23
Last Modified:18 Aug 2011 12:03

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