Dielectric spectroscopy of a high-polarization ferroelectric liquid crystal

Abstract

Dielectric spectroscopy investigations in the frequency range 50 Hz to 1 MHz have been carried out on a new ferroelectric liquid-crystalline material (S-(-)-4-(2-n-hexylpropionyloxy)biphenyl-4 0 -(3-methyl-4-decyloxy)benzoate) possessing a relatively large spontaneous polarization (P s $ 240 nC cm À2 ) and containing a lateral methyl group on the aromatic ring of the alkoxybenzoate unit. The effect of temperature on the dielectric relaxation modes has been investigated in the SmC* and N* phases. From dielectric dispersion data, relaxation frequency and dielectric strength of all detected relaxation modes have been evaluated and discussed. A new surface-like mode of relaxation frequency $11 kHz and dielectric strength 3.8, is seen to appear in the SmC* phase.

Electro-optic and dielectric studies of silica nanoparticle doped ferroelectric liquid crystal in SmC* phase

“…The dielectric studies have been carried out in SmC* phase in the frequency range of 50 Hz to 1 MHz by LCR meter (model Fluke-PM6306). To avoid the low and high frequency corrections data were calibrated with air and benzene [32].…”

Dielectric study of three homologous Schiff base ferroelectric liquid crystals with the variations of temperature and frequency

“…This result of variation of relative permittivity with frequency for the sample SB(S)-8 is found to be similar to that in a previously published work. 32 The relative permittivity parameter depicts the charge storage capacity of LC materials, and that is why these materials are applicable in the charge storage devices in the low-frequency region. Dielectric loss (imaginary part of complex dielectric permittivity, i.e., ε″) shows the dissipation of energy in the dielectric medium.…”

“…The dielectric studies carried out on FLC possessing high spontaneous polarization are especially noteworthy. 32 Study of tangent loss factor (tan δ) with the variation of frequency of FLC has been reported recently. 33 Evaluation of the timedependent memory effect has also been investigated.…”

Electro-optic, dielectric and optical studies of NiFe2O4-ferroelectric liquid crystal: a soft magnetoelectric material

“…These materials have a fast response time, low threshold voltage, better contrast, wide view angle, memory, etc. [1][2][3] In the past years, research in nanoparticle (NP)-LC composites have received scientific curiosity in the field of self-assembled functional materials. [4] The interest in this area is due to the blend of two active fields, namely nanoscience and soft materials.…”