Dielectric dispersion in a dual-frequency nematic liquid crystal 2-chloro-4-(4-pentylbenzoyloxy)benzoate

Temperature dependences of dielectric dispersions in the homogenous and homeotropic alignment cells of 2-chloro-4-(4-pentylbenzoyloxy)benzoate (PCPB) were measured in the nematic phase in the frequency range between 100 Hz and 1 MHz. The obtained dielectric dispersions, ′(ω) and ′′(ω), could be expl...

Full description

Saved in:
Bibliographic Details
Published in:Japanese Journal of Applied Physics 2018-11, Vol.57 (11S), p.11
Main Authors: Takikawa, Yoshinori, Kaneko, Kosuke, Odani, Shunsuke, Lee, In-Hwan, Iwata, Makoto
Format: Article
Language:English
Subjects:
Anisotropy
Crossovers
Dependence
Dielectrics
Dispersions
Frequency ranges
Least squares method
Liquid crystals
Nematic crystals
Parameters
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Temperature dependences of dielectric dispersions in the homogenous and homeotropic alignment cells of 2-chloro-4-(4-pentylbenzoyloxy)benzoate (PCPB) were measured in the nematic phase in the frequency range between 100 Hz and 1 MHz. The obtained dielectric dispersions, ′(ω) and ′′(ω), could be explained using the Cole-Cole formula accounting for DC conduction. The parameter values in this formula were determined by the least-squares method. The frequency dependence of the dielectric anisotropy, including the dual-frequency characteristic, was well reproduced with our parameter values. The activation energy Ea for molecular reorientation was estimated as approximately 9 × 102 meV. The crossover frequency fc was approximately proportional to the relaxation frequency fr in PCPB.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.57.11UB02