ABSTRACT

Thermodynamic models based on the Landau free-energy density are popular and well suited to study the phase transition properties of ferroelectric and antiferroelectric liquid crystals. Ferroelectric and antiferroelectric liquid crystals have molecular chirality which play an important role in the technology of liquid crystals for the application of devices performance. The structural properties of ferroelectric phase transitions which give rise to the macroscopic tensors coupled to the macroscopic fields, the parameters describing the antiferroelectric phase transitions are still under investigation due to the lack of precise symmetrical properties characterising their existence. The study of ferroelectric and antiferroelectric liquid crystals has been substantial experimental strides. In theoretical approach, there has been relatively inappreciable work on this fascinating class of material. The present review paper focused on a comprehensive overview of the current scenario of the phase transition properties of ferroelectric and antiferroelectric liquid crystals for the fundamental and technological applications. The Landau Ginzburg theory of the phase transitions between ferroelectric and antiferroelectric liquid mesophases is investigated. The important experimental and theoretical developments of ferroelectric and antiferroelectric mesogens are also summarised.

摘要

基于朗道自由能密度的热力学模型很受欢迎，非常适合研究铁电和反铁电液晶的相变特性。铁电和反铁电液晶具有分子手性，其在液晶技术中对器件性能的应用起着重要作用。铁电相变的结构特性会引起与宏观场耦合的宏观张量，由于缺乏表征其存在的精确对称特性，因此仍在研究描述反铁电相变的参数。铁电和反铁电液晶的研究已经取得了实质性的实验进展。从理论上讲，在这种引人入胜的材料类别上，还没有相对可观的工作。本综述的重点是对用于基础和技术应用的铁电和反铁电液晶的相变特性的当前情况进行了全面的概述。研究了铁电和反铁电液体中间相之间的相变的Landau Ginzburg理论。还总结了铁电和反铁电介元的重要实验和理论进展。研究了铁电和反铁电液体中间相之间的相变的Landau Ginzburg理论。还总结了铁电和反铁电介元的重要实验和理论进展。研究了铁电和反铁电液体中间相之间的相变的Landau Ginzburg理论。还总结了铁电和反铁电介元的重要实验和理论进展。