摘要
铁电液晶存在着自发极化特性，这是由于在这些液晶相中分子间相互作用使分子与自发偶极矩相关的旋转受到限制所致。自发极化是一个非常重要的参数，它与外电场的耦合是手性倾斜近晶相所有应用的基础。自发极化的测量可通过获得极化反转感应的电流进行。本文对各种测试方法进行了简单的评述，并着重对测量中使用方波和三角波的方法进行了比较，实验中发现三角波的方法更易将产生的自发极化反转电流与电容充电电流、离子位移电流分离，因而所获得的实验结果更准确。
お? The ferroelectric liquid crystal materials exist spontaneous polarization as the rotation of chiral molecules is restricted by the molecule’s structure The spontaneous polarization is a very important parameter for all applications of the chiral smectic C liquid crystal The direct method for measuring spontaneous polarization in ferroelectric liquid crystal is to obtain the polarization current arouse by the molecoule inversion in the cell under external electric field Rectangular and triangular waves were used to measure the spontaneous polarization From the results, it is found that the use of the triangular waves can easily subtract the background contribution due to the conductive and the capacity current and accurately determine the spontaneous polarization
出处
《液晶与显示》
CAS
CSCD
1998年第2期79-85,共7页
Chinese Journal of Liquid Crystals and Displays
基金
中国科学院院长基金
