Molecular Orientational Structures in Ferroelectric, Ferrielectric and Antiferroelectric Smectic Liquid Crystal Phases as Studied by Conoscope Observation
Molecular Orientational Structures in Ferroelectric, Ferrielectric and Antiferroelectric Smectic Liquid Crystal Phases as Studied by Conoscope Observation
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锥光观察研究铁电、亚铁电和反铁电近晶液晶相的分子取向结构
DOI：
10.1143/jjap.29.131
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发表时间：
1990
影响因子：
1.5
通讯作者：
A. Fukuda
中科院分区：
文献类型：
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作者：
E. Górecka;A. Chandani;Y. Ouchi;H. Takezoe;A. Fukuda
用锥光观察法研究了MHPOBC的分子取向结构。相反的铁电响应的锥光的电场在近晶C* 相，锥光图在反铁电近晶CA* 相不移动其中心，是双轴的，其光学平面垂直于场方向。这种锥光镜的变化只是由于介电的贡献，表明存在的电场诱导的铁电相的过渡的固有阈值。在铁电相和反铁电相之间，铁电相在锥光图形的场响应中被清楚地区分开;锥光中心垂直于外加场的移动和双轴光学平面平行于场的移动表明了一种新的分子取向结构。
Molecular orientational structures in MHPOBC were studied by means of conoscope observation. Contrary to a ferroelectric response of the conoscope to an electric field in the smectic C* phase, the conoscopic figure in the antiferroelectric smectic CA* phase does not shift its center and is biaxial with its optic plane perpendicular to the field direction. This conoscope change is only due to a dielectric contribution, indicating the existence of the inherent threshold in the electric field induced transition to the ferroelectric phase. In between the ferroelectric and antiferroelectric phases, a kind of ferrielectric phase was clearly distinguished in the field response of the conoscopic figure; the shift of the conoscope center perpendicular to the applied field and the biaxial optic plane parallel to the field suggest a novel molecular orientational structure.
Y. Ouchi、H. Takezoe 和 A. Fukuda：铁电体。
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