Polymorphism of Chiral Thioester Studied by Dielectric Spectroscopy - Université du Littoral Côte d'Opale
Article Dans Une Revue Acta Physica Polonica A Année : 2013

Polymorphism of Chiral Thioester Studied by Dielectric Spectroscopy

Résumé

(S)-(+)-4′-[(4-(1-methylheptyloxycarbonylphenyl) thiocarbonylphenyl]-decyloxybenzoate (in short 10.OPOSMH) was studied by complementary methods. The substance shows rich polymorphism. In addi- tion to ferroelectric and antiferroelectric smectic C∗ phases it possesses three ferrielectric sub-phases. Phase transitions between the phases were revealed by differential scanning calorimetry and static dielectric permittivity measurements. The aim of this paper was to study phase transitions and differences in dielectric spectra shown by different phases. Collective and molecular dynamics of all phases shown by 10.OPOSMH will be discussed in terms of theoretical models. Dielectric spectra of antiferroelectric phase show two characteristic dielectric relaxation modes: one connected with the molecular process (reorientation around the short axis) and the other originating from fluctuations of antiferroelectric order parameters.

Dates et versions

hal-04247528 , version 1 (18-10-2023)

Identifiants

Citer

A.I. Wawrzyniak, J. Chruściel, Redouane Douali, Frédéric Dubois, Jean-Marc Leblond, et al.. Polymorphism of Chiral Thioester Studied by Dielectric Spectroscopy. Acta Physica Polonica A, 2013, 124 (6), pp.933-936. ⟨10.12693/APhysPolA.124.933⟩. ⟨hal-04247528⟩
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