Tolédano P, Figueiredo Neto A M, Boulbitch A A, Roy A
Instituto de Física, Universidade de São Paulo, Caixa Postal 66318, 05315-970, São Paulo, SP, Brazil.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 1999 Jun;59(6):6785-97. doi: 10.1103/physreve.59.6785.
The stable antiferroelectric and ferrielectric smectic phases which may arise below a chiral SmA* phase are investigated theoretically. The symmetry and physical properties of the bilayer and multilayer configurations are worked out. Antiferroelectric and ferrielectric bilayer and multilayer configurations, possessing an induced spontaneous ferroelectric polarization component perpendicular to the smectic layers, are shown to take place, as the result of a nonlinear piezoelectric effect. These states of low polar symmetries occur when the angle between the inlayer projections of the dipoles and the director of the molecules is different from 90 degrees.
理论上研究了可能在手性近晶A*相以下出现的稳定反铁电和铁电近晶相。计算了双层和多层结构的对称性和物理性质。由于非线性压电效应，具有垂直于近晶层的感应自发铁电极化分量的反铁电和铁电双层及多层结构被证明会出现。当偶极子的层内投影与分子指向矢之间的夹角不同于90度时，就会出现这些低极性对称状态。
