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Comparative dielectric parameters and conductivity mechanisms of pyridine-based rod-like liquid crystals

机译：基于吡啶的棒状液晶的比较介电参数和电导机制

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摘要

In this study, the dielectric properties and ac conductivity mechanism of pyridine-based rod-like liquid crystals (LC1andLC2), which show enantiotropic smectic A mesophase, have been investigated by impedance spectroscopy within the frequency interval of 1 kHz-2 MHz. The variation of real and imaginary component of dielectric constant with angular frequency has been investigated. The temperature-dependent absorption coefficient alpha, relaxation time tau(o), dielectric strength value Delta epsilon, temperature-dependent changes on crystal, SmA and Iso phases have been given. These values were obtained by fitting the experimental results in epsilon '-omega graph with the Cole-Cole equation real equation and Origin Pro Graph program. The frequency dependence of ac conductivities has also been analyzed. Different conductivity mechanisms, i.e. dc conductivity, correlated barrier hoping and quantum mechanical tunneling behaviors have been determined for different frequency regions.
机译：在这项研究中，在1kHz-2MHz的频率范围内，通过阻抗谱研究了吡啶基棒状液晶（LC1andLC2）的介电性能和交流导电机理，该液晶显示出对映近晶A中间相。研究了介电常数实部和虚部随角频率的变化规律。给出了温度相关的吸收系数α、弛豫时间tau（o）、介电强度δε、晶体、SmA和Iso相的温度相关变化。这些值是通过使用Cole-Cole方程实方程和Origin Pro graph程序对epsilon'-omega图中的实验结果进行拟合得到的。还分析了交流电导率的频率依赖性。对于不同的频率区域，已经确定了不同的导电机制，即直流导电、相关势垒和量子力学隧穿行为。

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