Electro-optic and piezo-optic studies of an antiferro-ferri-ferro-electric system

W. K. Robinson, C. Carboni, H. F. Gleeson, M. Hird, P. Styring, A. Seed

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Abstract

A detailed study of a novel material exhibiting antiferro-, ferri-, and ferroelectric phases has been undertaken. The tilt angle, spontaneous polarisation and the dynamics of the helical unwinding have been examined as a function of temperature and voltage in all the phases of interest. The material exhibits large tilt angles (approx.31°) and values of spontaneous polarisation (approx.100nCcm-2) in cases where the helix is totally unwound. The behaviour of tilt angle as a function of applied electric field is examined in the ferri- and antiferro-electric phases. A stepwise increase in tilt angle as a function of applied voltage in the ferri-electric phase is presented, as well as unusual behaviour in the antiferro-electric state. In addition, a preliminary investigation of the change in spontaneous polarisation as a function of pressure is presented. It is shown that the dependence of spontaneous polarisation in the ferroelectric phase is relatively weak.

Original languageEnglish
Pages (from-to)69-79
Number of pages11
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume263
Issue numberpt 4
Publication statusPublished - 1995

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ASJC Scopus subject areas

  • Condensed Matter Physics

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