铁电性
材料科学
旋转粘度
电介质
凝聚态物理
液晶
放松(心理学)
矫顽力
粘度
相界
相(物质)
物理
光电子学
复合材料
社会心理学
量子力学
心理学
作者
S. Krishna Prasad,S. M. Khened,S. Chandrasekhar
出处
期刊:Ferroelectrics
[Informa]
日期:1993-10-01
卷期号:147 (1): 351-365
被引量:21
标识
DOI:10.1080/00150199308217205
摘要
Abstract We present here an overview of our high pressure investigations on ferroelectric liquid crystals. We begin with a brief description of the optical and electrical high pressure set up, followed by data highlighting the influence of pressure on a variety of properties. The results can be summarized as follows. At a constant relative temperature (with respect to the A–C* phase boundary) the spontaneous polarisation (Ps) decreases linearly with increasing pressure, whereas the coercive field Ec' the critical field Eu for unwinding the helix and the rotational viscosity γΦ associated with ferroelectric switching increase linearly with pressure. The temperature and frequency dependence of the transverse dielectric constant show more dramatic changes. The dominant effect on the dielectric constant appears to be due to the slowing down of the director relaxation modes, viz., the Goldstone mode and the soft mode with pressure. The ferroelectric switching time estimated from the simple relation τ = γ /Ps E shows a linear increase with pressure. Experiments are in progress to measure the pressure dependence of the pitch.
科研通智能强力驱动
Strongly Powered by AbleSci AI