Title:	High pressure studies on ferroelectric liquid crystals
Authors:	Krishna Prasad, S. Khened, S.M. Chandrasekhar, S.
Issue Date:	Oct-1993
Publisher:	Taylor & Francis Group
Citation:	Ferroelectrics, 1993, Vol.147, p351-365
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 b.gammab.Phi 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 b.tau = b.gamma /Ps E shows a linear increase with pressure. Experiments are in progress to measure the pressure dependence of the pitch.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/2845
ISSN:	0015-0193 1563-5112(Online)
Alternative Location:	http://dx.doi.org/10.1080/00150199308217205
Copyright:	1993 Taylor & Francis
Appears in Collections:	Research Papers (SCM)

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