Spontaneous Polarization and Dielectric Relaxation Dynamics of Two Novel Diastereomeric Ferroelectric Liquid Crystals

• Authors: Lei-Ching Huang , Chao-Ming Fu
• Languages of publication: EN

Abstracts

EN

This study reports on the spontaneous polarization and molecular dynamics of two diastereomeric ferroelectric liquid crystals with a phenyl core ring but with different types of diastereomeric structures. The magnitudes of spontaneous polarization, measured via an Automated LC Property Tester, were similar for the two ferroelectric liquid crystals. The complex dielectric spectra, measured via an impedance analyzer, indicated the existence of the Goldstone mode in the ferroelectric (SmC*) phase for the two ferroelectric liquid crystals. Moreover, a novel ferrielectric-like (SmCγ*-like) phase was observed at certain temperatures. The complex dielectric spectra of the two ferroelectric liquid crystals were optimally analyzed by a theoretical model composed of the Debye model and the Cole-Cole model. The physical parameters such as relaxation frequency and dielectric strength were determined by a dielectric relaxation study, and the obtained parameters varied in accordance with phase transition sequence. The experimental results of dielectric spectra and spontaneous polarization are explained in the discussion of the mesomorphic properties related to the ferroelectric liquid crystal molecular structure.

Keywords

EN

77.84.Nh; 77.22.Gm

Discipline

• 77.22.Gm: Dielectric loss and relaxation
• 77.84.Nh: Liquids, emulsions, and suspensions; liquid crystals(for structure of liquid crystals, see 61.30.-v)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2016
• Volume: 129
• Issue: 1
• Pages: 97-102

Dates

published

2016-01

received

2015-03-15

(unknown)

2015-09-20

(unknown)

2015-11-29

Contributors

author

Lei-Ching Huang

• Department of Physics, National University of Taiwan, Taipei 106, Taiwan

author

Chao-Ming Fu

• Department of Physics, National University of Taiwan, Taipei 106, Taiwan

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Identifiers

DOI

10.12693/APhysPolA.129.97