ABSTRACT

Dielectric (impedance) spectroscopy of liquid crystals is a powerful experimental technique. It is especially essential because liquid crystals in many applications are still controlled by the electric field. In this paper, the problems with the high frequency (>1 MHz) measurements in classical (in the shape of the flat capacitor) measuring cells are discussed. The procedure for overcoming measurement difficulties was presented and applied to the dielectric response of antiferroelectric, binary mixture. Additionally, the paper presents the first example of extending the measuring range of dielectric spectroscopy from 1 MHz to ~50 MHz by overcoming the parasitic effect related to resonance in measuring setup.

摘要

液晶的介电（阻抗）光谱是一种强大的实验技术。这是特别重要的，因为在许多应用中，液晶仍然受电场控制。本文讨论了经典（扁平电容器形状）测量单元中的高频（> 1 MHz）测量问题。提出了克服测量困难的程序，并将其应用于反铁电二元混合物的介电响应。此外，本文提出了第一个示例，该示例通过克服与测量设置中与谐振相关的寄生效应，将介电谱的测量范围从1 MHz扩展到〜50 MHz。