A phase diagram near the NAC* point in liquid crystals

Salihoğlu, S.; Tüblek, A.; Yurtseven, H.

doi:10.1080/01411590008244103

Cited by 6 publications

(2 citation statements)

References 45 publications

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“…Using the mean field theory, we have calculated P-T [27,28] and T-X [29] phase diagrams in ammonium halides, ammonia [30], ice [31][32][33], and regarding the liquid crystals phase diagrams near the nematic-Sm A-Sm C (NAC) [34,35] and nematic-Sm A-Sm C* (NAC*) [36] point in our earlier studies.…”

Section: Introductionmentioning

confidence: 99%

Calculation of a generalised smectic–hexatic phase diagram in liquid crystals

Yurtseven

Karaçalı

2012

Physics and Chemistry of Liquids

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This study gives a generalised smectic-hexatic phase diagram calculated by the Landau mean field theory. Our calculated phase line equations are fitted to the experimental phase lines, which represent first-order transition for the liquid crystals studied here. The temperature-and concentrationdependent phase lines calculated in this study describe the observed T-X phase diagram for the smectic-hexatic transitions. This indicates that the method of calculating the phase line equations from the mean field theory is general and it can be applied to other phase transitions in liquid crystals.

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Section: Introductionmentioning

confidence: 99%

Calculation of a generalised smectic–hexatic phase diagram in liquid crystals

Yurtseven

Karaçalı

2012

Physics and Chemistry of Liquids

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“…These bilinear coupling P [10,11] and the biquadratic coupling P 2 2 [12][13][14][15] between the spontaneous polarisation P and the tilt angle have been considered in the mean field models for various liquid crystalline systems. Regarding the biquadratic P 2 2 coupling, we have studied the mean field models for the AC* transition in A7 [3,16,17], in binary mixtures [18][19][20][21][22] and also for the C* phase of SCE9 and SCE10 [23].…”

Section: Introductionmentioning

confidence: 99%

Critical behaviour of the dielectric constant for the smectic AC* transition under the electric field in ferroelectric liquid crystals

Yurtseven

Kilit

2012

Physics and Chemistry of Liquids

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The temperature dependencies of the dielectric constant and the tilt angle (order parameter) are calculated under the electric field for the smectic A-smectic C* (AC*) transition in 4-(3-methyl-2-chlorobutanoyloxy)-4 0 -heptyloxybiphenyl (A7). The dielectric constant is fitted to the experimental data by using our mean field model with the biquadratic coupling between the spontaneous polarisation P and the tilt angle . Our results show that the mean field model with the P 2 2 coupling describes satisfactorily the observed behaviour of the AC* transition in A7. It is indicated here that a first-order AC* transition occurring at low electric fields changes its character towards a second order as the electric field increases in A7.

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A temperature–concentration (T–X) phase diagram calculated using the mean field theory for liquid crystals

2013

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Phase-line equations for smectic-hexatic phase transitions in liquid crystals were derived using the Landau phenomenological theory. In particular, second-order transitions for the smectic-A-smectic-C (SmA-SmC) and hexatic-B-hexatic-F (or HexI) transitions were studied and the tricritical points for these transitions were located. The calculated phase-line equations were fitted (using experimental data for various liquid crystals) to construct a generalized T-X phase diagram. It was shown that the T-X phase diagram calculated from the free energy adequately describes the observed behavior of liquid crystals during smectic-hexatic transitions.

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A phase diagram near the NAC* point in liquid crystals

Cited by 6 publications

References 45 publications

Calculation of a generalised smectic–hexatic phase diagram in liquid crystals

Calculation of a generalised smectic–hexatic phase diagram in liquid crystals

Critical behaviour of the dielectric constant for the smectic AC* transition under the electric field in ferroelectric liquid crystals

A temperature–concentration (T–X) phase diagram calculated using the mean field theory for liquid crystals

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