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@ARTICLE{Dey:452032,
author = {Dey, Kartick Ch. and Mandal, Pradip Kumar and Kula,
Przemysław},
title = {{E}ffect of fluorinated achiral chain length on structural,
dielectric and electro-optic properties of two terphenyl
based antiferroelectric liquid crystals},
journal = {Journal of molecular liquids},
volume = {298},
issn = {0167-7322},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {PUBDB-2020-04473, I-20170021},
pages = {112056},
year = {2020},
note = {Waiting for fulltext},
abstract = {Two antiferroelectric liquid crystals of different
fluorinated chain length have been studied. Although both
exhibit antiferroelectric (SmC$_A$*), ferroelectric (SmC*)
and paraelectric (SmA*) phases, melting point decreases with
increasing achiral chain length but clearing point shows
opposite trend. Thermal ranges of SmC$_A$* and SmC* phases
exhibit odd-even effect like the dipole moments and
spontaneous polarization. Layer spacings, average
intermolecular distances and correlation lengths across the
smectic planes also increase with chain length. Temperature
dependence of layer spacings, x-ray tilt, optical tilt and
spontaneous polarization suggest tricritical nature of
SmC*–SmA* transition. Dielectric increments decrease with
increased achiral chain. Both soft mode and Goldstone mode
critical frequencies decrease with decreasing temperature in
the lower derivative but opposite behaviour is observed in
the higher derivative. Both the compounds show Curie–Weiss
behaviour in soft mode near SmC*–SmA* transition
temperature (T$_c$). Goldstone mode critical frequency is
much higher in the higher derivative. Both in-phase and
anti-phase antiferroelectric modes are observed in SmC$_A$*
phase in the higher derivative but in the lower derivative
only anti-phase antiferroelectric mode is observed. Optical
tilts suggest orthoconic nature of the SmC$_A$* phase of
both the compounds. Ferroelectric- antiferroelectric
transition temperature decreases with increasing ac field in
both compounds.},
cin = {DOOR ; HAS-User},
ddc = {540},
cid = {I:(DE-H253)HAS-User-20120731},
pnm = {6G3 - PETRA III (POF3-622) / FS-Proposal: I-20170021
(I-20170021) / INDIA-DESY - INDIA-DESY Collaboration
$(2020_Join2-INDIA-DESY)$},
pid = {G:(DE-HGF)POF3-6G3 / G:(DE-H253)I-20170021 /
$G:(DE-HGF)2020_Join2-INDIA-DESY$},
experiment = {EXP:(DE-H253)P-P07-20150101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000512219300082},
doi = {10.1016/j.molliq.2019.112056},
url = {https://bib-pubdb1.desy.de/record/452032},
}