Influence of Pressure and Impurity Concentration on Ferroelectricity in a Liquid Crystal

Uehara, Hiroki; Toshimitsu, Megumi; Hatano, Jun

doi:10.1080/713716366

Ferroelectrics

2002

DOI: 10.1080/713716366

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Influence of Pressure and Impurity Concentration on Ferroelectricity in a Liquid Crystal

Hiroki Uehara¹,

Megumi Toshimitsu²,

Jun Hatano³

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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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Pressure and temperature dependences of ferroelectricity in liquid crystals

Kumari

Singh

2013

Liquid Crystals

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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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Influence of Pressure and Impurity Concentration on Ferroelectricity in a Liquid Crystal

Cited by 2 publications

References 0 publications

Pressure and temperature dependences of ferroelectricity in liquid crystals

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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