Dielectric spectroscopy and electrical conductivity measurements of a series of orthoconic antiferroelectric liquid crystalline esters

Dielectric spectroscopic measurements of five homologous series of orthoconic antiferroelectric liquid crystalline (OAFLC) esters (S)-MHPOBC ((S)-4-(1-methylheptyloxy) carbonyl phenyl 4 ' -octyloxy-4-biphenylcarboxylate) has been investigated. The investigated compound contains SmC*, SmC A * an...

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Bibliographic Details
Published in:Ferroelectrics 2021-01, Vol.570 (1), p.100-114
Main Authors: Nepal, Shantiram, Das, Banani, Das, Malay Kumar, Sarkar, Madhumita Das, Dabrowski, Roman
Format: Article
Language:English
Subjects:
Antiferroelectricity
Carbonyl compounds
Carbonyls
Cole-Cole
Crystal structure
Crystallinity
Dielectric properties
Dielectric relaxation
Dielectric spectroscopy
Dielectric strength
Dispersion curve analysis
Electrical resistivity
Esters
Homology
Liquid crystals
orthoconic antiferroelectric liquid crystals
relaxation modes
Relaxation time
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Summary:Dielectric spectroscopic measurements of five homologous series of orthoconic antiferroelectric liquid crystalline (OAFLC) esters (S)-MHPOBC ((S)-4-(1-methylheptyloxy) carbonyl phenyl 4 ' -octyloxy-4-biphenylcarboxylate) has been investigated. The investigated compound contains SmC*, SmC A * and SmA phase with SmC A * phase at a broad temperature range. Parameters such as absorption curve, dispersion curve, Cole-Cole plot, relaxation frequency, relaxation time, dielectric strength and electrical conductivity has been discussed. The structure property correlations of these compounds are also highlighted in the light of the dielectric measurements. Compound S1.6 (FF) and S2.6 (FH) has dielectric strength of around 250 in the SmC* phase due to the presence of Goldstone mode.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150193.2020.1839260