Abstract

Dielectric spectroscopic measurements of five homologous series of orthoconic antiferroelectric liquid crystalline (OAFLC) esters (S)-MHPOBC ((S)-4-(1-methylheptyloxy) carbonyl phenyl 4^’-octyloxy-4-biphenylcarboxylate) has been investigated. The investigated compound contains SmC*, SmC_A* and SmA phase with SmC_A* phase at a broad temperature range. Parameters such as absorption curve, dispersion curve, Cole-Cole plot, relaxation frequency, relaxation time, dielectric strength and electrical conductivity has been discussed. The structure property correlations of these compounds are also highlighted in the light of the dielectric measurements. Compound S1.6 (FF) and S2.6 (FH) has dielectric strength of around 250 in the SmC* phase due to the presence of Goldstone mode.

摘要

五个同源系列（S）-MHPOBC（（S）-4-（1-甲基庚氧基）羰基苯基4- orthoconic反铁电液晶（OAFLC）酯的电介质光谱测量^“ -octyloxy -4-联苯甲酸甲酯）进行了研究。所研究的化合物包含SmC *，SmC _A *和SmA相以及SmC _A*相在较宽的温度范围内。讨论了吸收曲线，色散曲线，科尔-科尔图，弛豫频率，弛豫时间，介电强度和电导率等参数。这些化合物的结构性质相关性也根据介电测量结果突出显示。由于存在戈德斯通模式，化合物S1.6（FF）和S2.6（FH）在SmC *相中的介电强度约为250。