Ferroelectric properties of smectic liquid crystal

Ostrovski, B. I.; Rabinovich, A. Z.; Sonin, A. S.; Strukov, B. A.; Taraskin, S. A.

doi:10.1080/00150197808237207

Cited by 52 publications

(11 citation statements)

References 2 publications

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“…The molecules in the former are, on average, normal to the layer and are described by a onedimensional mass-density wave, while those of the latter are tilted. A number of experiments [1][2][3][4][5][6][7][8] have been carried out on the SmA to SmC ͑SmA-SmC͒ phase transition. Although in most of the materials studied the SmA-SmC phase transition appears to be of second order, first order transition also occur in several ferroelectric liquid crystals [9][10][11] and in a binary mixture of liquid crystal.…”

Section: Introductionmentioning

confidence: 99%

Tricritical behavior of the smectic-A to smectic-C phase transition in a liquid crystal mixture

Das

Mukherjee

2008

The Journal of Chemical Physics

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A phenomenological approach to the description of the smectic-A to smectic-C phase transition in a liquid crystal mixture is proposed. The problem of the first or second order transition is explored by means of the variation of the concentration. The influence of the concentration on this transition is discussed by varying the coupling between the concentration variable and the order parameters. We show that a tricritical point on the smectic-A to smectic-C phase transition line can be achieved under certain conditions. The theoretical prediction is found to be in good qualitative agreement with experimental results.

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Section: Introductionmentioning

confidence: 99%

Tricritical behavior of the smectic-A to smectic-C phase transition in a liquid crystal mixture

Das

Mukherjee

2008

The Journal of Chemical Physics

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“…The values of these coefficients corresponding to P = 0 kbar for DOBAMBC are listed in Table 1. It has been predicted [23,24] that the Sm A-Sm C * transition in DOBAMBC at the atmospheric pressure is close to critical point and the temperature dependences of θ and P 0 is related to the temperature dependence of helical pitch (p = 2π/q) [25][26][27]. Based on these aspects, we assume that the pressure dependence of P 0 and θ is due to the pressure dependent Landau coefficients and T AC * .…”

Section: Resultsmentioning

confidence: 96%

Pressure and temperature dependences of ferroelectricity in liquid crystals

Kumari

Singh

2013

Liquid Crystals

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Based on Landau-de-Gennes type free-energy density expansion, we study the influence of pressure and temperature on the spontaneous polarisation, tilt angle and smectic A (Sm A) -chiral smectic C (Sm C * ) transition temperature (T AC * ) of ferroelectric mesogen p-(n-decyloxybenzilidene)-p -amino-(2-methylbutyl) cinnamate (DOBAMBC). The pressure dependence of the ferroic properties is incorporated through the pressure dependent Landau coefficients associated with the order parameters coupling terms of the free-energy density expansion. It is found that the application of pressure reduces the stability of Sm C * phase, while the stability of Sm A phase increases. The order parameter coupling terms play an important role and the ferroelectric properties are in good agreement with the available experimental data of DOBAMBC.

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“…Further, the weak difference between the temperature dependence of the molecular tilt angle and the spontaneous polarization has been known to be related with the temperature dependence of the helical pitch. [36][37][38] Based on these two aspects, we have investigated the pressure dependence of P 0 and θ 0 by considering that the Landau coefficients b, Λ, and d, and the Sm A-Sm C * transition temperature T c are pressure dependent. Taking the values of other seven coefficients (a 0 , c, K 3 , χ, f , e, and Z) corresponding to P = 0 kbar, we obtain the values of b(P ), Λ(P ), and d(P ) at a given pressure by the least-square fitting of the experimental data.…”

Section: Resultsmentioning

confidence: 99%

Effect of Pressure on Spontaneous Polarization and Tilt Angle in Ferroelectric Liquid Crystal Dobambc

Singh

2009

Int. J. Mod. Phys. B

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Using a thermodynamic model based on the generalized Landau free-energy density expansion, we investigate the influence of hydrostatic pressure on the spontaneous polarization and tilt angle of ferroelectric chiral smectic C (Sm C * ) phase near the Sm A-Sm C * transition in a ferroelectric mesogen DOBAMBC. It is shown that the pressure dependence of the tilt angle, spontaneous polarization and Sm A-Sm C * transition temperature (Tc) can be described in terms of four pressure-dependent Landau coefficients: two achiral coefficients a and b and two chiral coefficients Λ and d. The pressure dependence of the parameter a is due to the pressure-dependent Tc. With the increasing pressure, the stability of the Sm C * phase decreases. A close agreement between theory and experiment is found.

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Ferroelectric properties of smectic liquid crystal

Cited by 52 publications

References 2 publications

Tricritical behavior of the smectic-A to smectic-C phase transition in a liquid crystal mixture

Tricritical behavior of the smectic-A to smectic-C phase transition in a liquid crystal mixture

Pressure and temperature dependences of ferroelectricity in liquid crystals

Effect of Pressure on Spontaneous Polarization and Tilt Angle in Ferroelectric Liquid Crystal Dobambc

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