학술논문
Field induced modification of SmC*–SmCA * transition temperature of a fluorinated antiferroelectric liquid crystal
Document Type
Article
Source
Current Applied Physics, 9(3), pp.390-395 Mar, 2009
Subject
Language
English
ISSN
1567-1739
Abstract
The temperature and frequency dependent dielectric relaxation data and simultaneous observation of optical texture reveal co-existence of ferroelectric (SmC*) and antiferroelectric (SmCA *) phases in the pre-transition regime of the antiferroelectric liquid crystal (AFLC) sample viz. (R)-4-[1-methyl-2-(2,2,3,3,3-pentafluoropropyloxy)ethyloxy)carbonyl]phenyl 4'-decyloxybiphenyl-4-caboxylate. Interestingly, this sample shows irreversible change in the antiferroelectric to ferroelectric (AFE → FE) phase transition temperature (T0) for consecutively increasing bias field treatment in successive cycles. The lowest upper bound of the threshold field for AFE →FE transition at the boundary of the said phases is found to be ~1 kV cm-1.