High dielectric behavior and memory effect in a deformed helix ferroelectric liquid crystal with an antiferroelectric phase
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- 作者：Amrita Mukherjee ; M. Rahman ; S.S. Bhattacharyya ; B.K. Chaudhuri ; A. Yoshizawa
- 关键词：Cosmic-ray proton ; Cosmic-ray helium ; Atmospheric proton ; Solar modulation ; Superconducting spectrometer
- 刊名：Chemical Physics Letters
- 出版年：2007
- 出版时间：27 July 2007
- 年：2007
- 卷：443
- 期：1-3
- 页码：71-75
- 全文大小：201 K
文摘
A pure deformed helix ferroelectric liquid crystal (DHFLC) material viz. MOPBIC with antiferroelectric (AF) phase, having high spontaneous polarization (PS) and short pitch, is found to show large dielectric constant (ε′) which increases with increasing cell thickness. The molecular contributions from different bonds, groups and conformers to the dipole moment and the deformed helix configuration of the typical molecular structure of MOPBIC are attributed to these high values of PS and ε′. MOPBIC also exhibits high speed optical response over a wide temperature range and the frequency dependent memory effect.