In this research article, we have investigated the dielectric properties of a nematic liquid crystal (NLC), namely 4 cyano-4′- pentylbiphenyl (which is commonly known as 5CB), in sample cells of variable thickness. The dielectric behaviour has been studied through a LCR meter in the frequency ranging from 20 Hz to 1 MHz. It was observed that the real part of complex dielectric permittivity (ε') decreases and the peak value of the energy dissipated per unit cycle (ε'′) increases on increasing the cell thickness. It has also been noticed that the relaxation frequency of LC material under investigation shifts towards the lower side with the increment in the sample cell thickness. The observed dielectric behaviour has been attributed to the contribution of the ionic species available in the NLC used. The mobilized ions have a significant contribution in influencing the dielectric studies of 5CB in thin cells. Further, all the above mentioned physical attributes of 5CB will play an important role in fabricating a device which is not only cost effective but also has higher transmittance and negligible power consumption.

在这篇研究文章中，我们研究了向列液晶（NLC）在可变厚度的样品池中的介电性能，即4氰基-4'-戊基联苯（通常称为5CB）。通过LCR仪表对介电性能进行了研究，其频率范围为20 Hz至1 MHz。观察到，随着单元厚度的增加，复介电常数（ε'）的实部减小，并且每单位循环耗散的能量的峰值（ε''）增大。还已经注意到，随着样品池厚度的增加，所研究的LC材料的弛豫频率向下侧移动。观察到的介电行为归因于所用NLC中可用的离子种类的贡献。动员的离子在影响薄细胞中5CB的介电研究方面有重要贡献。此外，5CB的所有上述物理属性将在制造不仅具有成本效益而且具有更高的透射率和可忽略的功耗的装置中起重要作用。