Probing the material properties and phase transitions of ferroelectric liquid crystals by determination of the Landau potential

Archer, P. and Dierking, I. and Gortz, V. and Goodby, J. W. (2008) Probing the material properties and phase transitions of ferroelectric liquid crystals by determination of the Landau potential. The European Physical Journal E, 25 (4). pp. 385-393. ISSN 1292-8941

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Abstract

The full Landau potential of several, widely varying ferroelectric liquid-crystalline materials has been experimentally determined. Tilt angle and polarisation data is analysed across the SmA* to SmC* transition for varying applied electric-field amplitudes, allowing the determination of all the coefficients of the generalised Landau model of ferroelectric liquid crystals. The materials investigated encompass different materials, including low-polarisation mixtures to high-polarisation single-component materials. The materials also possess a variation in the order of the SmA* to SmC* phase transition from strongly first order to strongly second order. The effects of both the polarisation and order of phase transition of the system are discussed with respect to the various terms of the generalised Landau model. Further, the mechanisms behind the difference between a first- and second-order phase transition are discussed with respect to the Landau potential and the second Landau coefficient b.

Item Type: Journal Article
Journal or Publication Title: The European Physical Journal E
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1300/1304
Subjects:
ID Code: 65904
Deposited By: ep_importer_pure
Deposited On: 07 Aug 2013 10:30
Refereed?: Yes
Published?: Published
Last Modified: 01 Jan 2020 08:34
URI: https://eprints.lancs.ac.uk/id/eprint/65904

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