ABSTRACT Dielectric spectroscopic measurements have been reported on three synthesized pure liquid crystalline compounds having paraelectric (SmA*), ferroelectric (SmC*) and antiferroelectric (SmCA*) phases in the frequency range of 40 Hz–25 MHz. Several relaxation modes i.e. low-frequency PL Mode and high-frequency PH Mode in the SmCA* phase, Goldstone Mode (GM) in SmC* phase and Soft Mode (SM) in SmA* phase have been observed. These materials with wide antiferroelectric range are found to possess low relaxation times, thus making them promising materials for applications. The Cole–Cole plot shows the modes in the SmCA* phase to be much weaker than in the SmC* phase. Dielectric loss is maximum in SmC* phase due to the Goldstone Mode. Additionally, the AC electrical conductivity is found to be maximum in the SmC* phase and is dependent on the frequency. Maximum DC conductivity of these materials is of the order of 10−5 Ohm−1 m−1.

中文翻译：

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高倾斜反铁电材料的介电光谱和电导率测量

摘要 介电光谱测量已经报道了三种合成的纯液晶化合物，它们在 40 Hz-25 MHz 的频率范围内具有顺电 (SmA*)、铁电 (SmC*) 和反铁电 (SmCA*) 相。已经观察到几种弛豫模式，即 SmCA* 相中的低频 PL 模式和高频 PH 模式，SmC* 相中的戈德斯通模式 (GM) 和 SmA* 相中的软模式 (SM)。发现这些具有宽反铁电范围的材料具有低弛豫时间，从而使它们成为有前景的应用材料。Cole-Cole 图显示 SmCA* 相中的模式比 SmC* 相中的模式弱得多。由于 Goldstone 模式，SmC* 相的介电损耗最大。此外，发现交流电导率在 SmC* 相中最大，并且取决于频率。这些材料的最大直流电导率约为 10-5 Ohm-1 m-1。