Electro-Optic and Piezo-Optic Studies of an Antiferro-Ferri-Ferro-Electric System
作者:
W.K. Robinson,
C. Carboni,
H.F. Gleeson,
M. Hird,
P. Styring,
A. Seed,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 263,
issue 1
页码: 69-79
ISSN:1058-725X
年代: 1995
DOI:10.1080/10587259508033571
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
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 (∼31°) and values of spontaneous polarisation (∼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.
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