Dielectric characterisation of a ferroelectric liquid crystalline material having SmA-SmC-SmB^sub h^ phase sequence

Thermodynamical, optical and dielectric characterisation of a material possessing ferroelectric SmC* and hexatic SmB* phases has been carried out. Phase identification has been done by miscibility studies. From the dielectric studies, a relaxation mechanism is observed in the low MHz region of the S...

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Bibliographic Details
Published inLiquid crystals Vol. 41; no. 12; p. 1879
Main Authors Pandey, MB, Pandey, Sharad Kumar, Singh, UB, Dhar, R, Tykarska, M, Dabrowski, R
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis Ltd 01.12.2014
Subjects
Dielectric properties
Ferroelectrics
Optical properties
Phase transitions
Thermodynamics
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Summary:Thermodynamical, optical and dielectric characterisation of a material possessing ferroelectric SmC* and hexatic SmB* phases has been carried out. Phase identification has been done by miscibility studies. From the dielectric studies, a relaxation mechanism is observed in the low MHz region of the SmA* phase, which is related to the tilt fluctuation (soft mode) of the directors. In the SmC* phase, another collective relaxation mechanism has been observed in the kHz region, which is related to the phase fluctuation (Goldstone mode) of the directors. In the SmBh* phase, 2-weak relaxation modes are observed in the kHz and MHz frequency range, respectively, due to individual molecular rotations.
ISSN:0267-8292
1366-5855