Temperature Dependence of the Tilt Angle for the Smectic A-Smectic C* Transition in a Mixture of C7-70PDOB Ferroelectric Liquid Crystals near the Tricritical Point

Download

index.pdf

Date

2012-01-01

Author

KURT, MUSTAFA
Yurtseven, Hasan Hamit

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

77
views

33
downloads

The temperature dependence of the tilt angle theta is studied in the smectic C* phase near the smectic A-smectic C* tricritical point for a mixture of 70PD0B in the ferroelectric liquid crystal C7 (X = 16.92). The mean-field models with the biquadratic P-2 theta(2) (P is the spontaneous polarization) and P-2 theta(2) + P theta (bilinear) coupling terms in the free energy expansion are used to analyze the experimental data for the tilt angle in this binary mixture. From our analysis, the coefficients given in the free energy expansion of the mean-field models are determined. Our results show that the mean-field theory explains adequately the observed behaviour of the C7-70PD0B mixture near the AC* tricritical point.

Subject Keywords

Mean-Field model, Phase-transition, Electric-field, Crossover-Behavior, Binary-Mixture, Polarization, Parameters, Diagram

URI

https://hdl.handle.net/11511/40374

Journal

ADVANCES IN CONDENSED MATTER PHYSICS

DOI

https://doi.org/10.1155/2012/201972

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Temperature dependence of the order parameters (spontaneous polarisation and the tilt angle) at various concentrations for a mixture of SCE9+SCE10 Yurtseven, Hasan Hamit (2012-01-01) The smectic A- smectic C* (AC*) transition in a binary mixture of SCE9+SCE10 is studied at various concentrations of SCE9 near (x(c) = 0.12) and above xc (tricritical concentration). The temperature dependences of the spontaneous polarisation and the tilt angle (order parameters) are calculated using our mean field model with the bilinear and biquadratic couplings between these two order parameters. The expressions derived from the mean field model are fitted to the experimental data from the literature and...
Temperature dependence of the polarization and tilt angle under an electric field close to the smectic AC* phase transition in a ferroelectric liquid crystal Yurtseven, Hasan Hamit (Informa UK Limited, 2008-01-01) The temperature dependence of the polarization P and the tilt angle theta is calculated here in the presence of a constant electric field near the smectic AC* phase transition of a ferroelectric liquid crystal using a mean field model. We demonstrate here the temperature dependence of P and theta under some fixed electric fields for the ferroelectric liquid crystal of 4-(3-methyl-2-chlorobutanoyloxy)-4'-heptyloxybiphenyl. Our predicted values of P and theta at various temperatures under fixed electric field...
Temperature and Pressure Effect on the Raman Frequencies Calculated from the Crystal Volume in the gamma-Phase of Solid Nitrogen Yurtseven, Hasan Hamit (Springer Science and Business Media LLC, 2015-09-01) The temperature and pressure dependences of the Raman frequencies of the lattice modes (E-g and B-1g modes) and of an internal mode (2331 cm(-1)) are predicted using the observed molar volume data from the literature in the gamma-phase of solid N-2. This calculation is carried out by means of the mode Gruneisen parameter of each Raman mode in the gamma-phase of solid nitrogen. Our results show that the predicted Raman frequencies of the E-g mode increase as the pressure increases. The Raman frequencies of t...
Temperature dependence of the polarization, dielectric constant, damping constant and the relaxation time close to the ferroelectric-paraelectric phase transition in LiNbO3 Kiraci, A.; Yurtseven, Hasan Hamit (2017-01-01) We calculate the order parameter (spontaneous polarization) and the inverse dielectric susceptibility at various temperatures in the ferroelectric phase of LiNbO3 for its ferroelectric-paraelectric phase transition (T-C =1260 K) using the Landau phenomenological model. For this calculation, the Raman frequencies of the soft optic mode (TO1) are used as the order parameter and the fitting procedure is employed for both the order parameter and the inverse dielectric susceptibility by means of the observed dat...
Temperature dependence of the Raman frequency of an internal mode for SiO2-moganite close to the α-β Transition Lider, Mustafa Cem; Yurtseven, Hasan Hamit (2012-12-01) The temperature dependence of the 501 cm frequency of the vibrational mode is analyzed for SiO moganite. The experimental data for the heating and cooling cycles of moganite from the literature is used for our analysis. The coexistence of moganite is obtained over a finite temperature interval, and the moganite transition at around 570 K is studied, as observed experimentally.

Citation Formats

M. KURT and H. H. Yurtseven, “Temperature Dependence of the Tilt Angle for the Smectic A-Smectic C* Transition in a Mixture of C7-70PDOB Ferroelectric Liquid Crystals near the Tricritical Point,” ADVANCES IN CONDENSED MATTER PHYSICS, pp. 0–0, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40374.