Dielectric relaxation modes in the antiferroelectric smectic CA* phase
Dielectric relaxation modes in the antiferroelectric smectic CA* phase
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反铁电近晶CA*相中的介电弛豫模式
DOI：
10.1080/00150199308217178
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发表时间：
1993
期刊：
影响因子：
0.8
通讯作者：
A. Fukuda
中科院分区：
文献类型：
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作者：
K. Hiraoka;H. Takezoe;A. Fukuda
摘要研究了4-(1-甲基-庚氧甲酰基)苯基-4‘-辛氧基联苯-4-羧酸酯(MHPOBC)反铁电体SMCA相的介电行为。在没有直流电场的情况下，在SMCA*中发现了两个介电弛豫。低频弛豫归因于分子围绕短轴的旋转，高频驰豫归因于反铁电有序的扭曲，相邻层中分子的相反旋转。此外，由于介电各向异性引起的螺旋形变在光学响应和锥面图形中也被观察到。用电光测量方法测量了集体螺旋涨落的驰豫频率。此外，我们还发现了在直流偏场作用下集体螺旋涨落的介电驰豫。
Abstract We have studied the dielectric behavior in the antiferroelectric SmCA* phase of 4-(1-methyl-heptyloxycarbonyl)phenyl 4'-octyloxybiphenyl-4-carboxylate (MHPOBC). Two dielectric relaxations were recognized without a dc field in SmCA*. The lower-frequency relaxation is attributed to the rotation around the short axis of molecules, and the higher-frequency one is due to the distortion of the antiferroelectric ordering; the opposite rotation of molecules in adjacent layers. In addition, the helical distortion due to the dielectric anisotropy was observed in optical responses as well as in conoscopic figures. The relaxation frequency of the collective helical fluctuation was measured by means of electro-optic measurements. Moreover, we found the dielectric relaxation of the collective helical fluctuation under the application of a dc bias field.
Y. Ouchi、H. Takezoe 和 A. Fukuda：铁电体。
DOI：
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