Phase Diagram of Confined Antiferroelectric Liquid Crystals in an Electric Field
作者:
Tiezheng Qian,
P.L. Taylor,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 2000)
卷期:
Volume 351,
issue 1
页码: 229-236
ISSN:1058-725X
年代: 2000
DOI:10.1080/10587250008023272
出版商: Taylor & Francis Group
关键词: antiferroelectric liquid crystal;phase diagram
数据来源: Taylor
摘要:
We study the electric-field-induced transitions in antiferroelectric liquid crystals in a model that takes into account the intralayer elastic distortion, the nearest-neighbor interlayer interaction, the coupling of the spontaneous polarization with the applied field, the dielectric anisotropy, and the surface anchoring. We find that the field-induced phase sequence has a critical dependence on cell thickness. For moderately thin cells (thickness > 0.1 μm) with moderately strong anchoring (surface coupling ∼ 10−4J/m2), the system, in departing from the initial anticlinic alignment, first undergoes a continuous Fréederiksz transition, then a first-order surface boundary-layer transition, and finally a first-order or continuous transition to a complete synclinic ordering. Reducing the cell thickness to less than 0.1 μm will make the Fréedericksz transition and even the boundary-layer transition vanish.
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