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Collective and molecular relaxation in ferroelectric liquid crystals

机译:铁电液晶中的集体和分子弛豫

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Abstract: Ferroelectric liquid crystals are molecular ferroelectrics showing up in the tilted liquid crystalline systems (SmC$+*$/, SmI$+*$/, SmF$+*$/) composed of chiral molecules. In this work, we present the dielectric, electro-optic, and calorimetric studies of a single component system: 3-octyloxy-6$LB@2-fluor-4-(2-fluoroctyloxy)phenyl$RB@-pyridine showing interesting ferroelectric properties. The compound exhibits a first order N$+*$/- SmC$+*$/ phase transition which leads to a qualitatively new behavior, for instance the relaxation frequency of the soft mode below T$-C$/ seems to be temperature independent. The high frequency relaxation process, connected with the reorientation around the long axis, is practically undisturbed at the N$+*$/-SmC$+*$/ transition. Yet, it was found that in the SmC$+*$/ phase, the best fit was obatined with two Cole-Cole functions yielding two relaxation times to describe a biased reorientation of molecules in the SmC$+*$/ phase. !18
机译:摘要:铁电液晶是由手性分子组成的倾斜液晶系统(SMC $ + * $ /,SMF $ + * $ /)中的分子铁电。在这项工作中,我们介绍了单一组分系统的电介质,电光和量热研究:3-辛基氧基-6 $ LB @ 2-氟-4-(2-氟乙烯氧基)苯基$ RB @-吡啶显示有趣的铁电特性。该化合物展示了一阶N $ + * $ / - SMC $ + * $ /阶段转换,这导致了一个定性的新行为,例如软模式下降-C $ /似乎是温度的弛豫频率。与长轴周围的重新定向有关的高频松弛过程,实际上不受干扰于N $ + * $ / - SMC $ + * $ /转换。然而,发现在SMC $ + * $ /阶段,最佳拟合与两个COLE-COLE功能逆时间,产生两个放松时间,以描述SMC $ + * $ /阶段的分子偏置的重新定位。 !18

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