Paraelectric-antiferroelectric phase transition in achiral liquid crystals.
Paraelectric-antiferroelectric phase transition in achiral liquid crystals.
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非手性液晶中的顺电-反铁电相变。
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Mieczkowski
中科院分区：
文献类型：
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作者：
D. Pociecha;E. Górecka;M. Čepič;N. Vaupotič;Kinga Gomola;J. Mieczkowski
从理论和实验上研究了非手性近晶相分子转动的临界冻结，通过二级顺电-反铁电（Sm-A->Sm-APA）相变导致极性有序。由于体系中弱的反铁电相互作用，Sm-A相中的极性模和Sm-APA相中的高强度介电模出现强烈的软化现象。在Sm-APA阶段的介电响应行为的关键时，由直流电场偏置。这种行为被发现一般的反铁电近晶相具有显着的四极层间耦合。
Critical freezing of molecular rotation in an achiral smectic phase, which leads to polar ordering through the second order paraelectric-antiferroelectric (Sm-A-->Sm-APA) phase transition is studied theoretically and experimentally. Strong softening of the polar mode in the Sm-A phase and highly intensive dielectric mode in the Sm-APA phase are observed due to weak antiferroelectric interactions in the system. In the Sm-APA phase the dielectric response behaves critically upon biasing by a dc electric field. Such a behavior is found general for the antiferroelectric smectic phase with significant quadrupolar interlayer coupling.