Calculation of the dielectric constant as a function of temperature near the smectic AC* phase transition in ferroelectric liquid crystals

2008-01-01
We calculate here. the dielectric constant E as a function of temperature for the AC* phase transition of a ferroelectric liquid crystal using a mean field model. Using the values of the polarization P and the tilt angle theta, calculated from the mean field model with the P-2 theta(2) coupling for 4-(3-methyl-2-chlorobutanoyloxy)-4'-heptyloxybiphenyl, the dielectric constant E is calculated in the smectic C* phase of this ferroelectric liquid crystal at various temperatures at constant electric fields.
FERROELECTRICS

Suggestions

Calculation of the Infrared Frequencies as a Function of Temperature Using the Volume Data in the Ferroelectric Phase of NaNO2
Yurtseven, Hasan Hamit (Informa UK Limited, 2014-02-17)
We calculate the temperature dependence of the infrared frequencies of the TO and LO modes with the symmetries of A(1), B-1 and B-2 mainly in the ferroelectric phase of NaNO2. This calculation is carried out using the volume dependence of the infrared frequencies through the mode Gruneisen parameter in this crystal. The volume dependences of the infrared frequencies are fitted to the observed frequencies by using constant mode Gruneisen parameter in the ferroelectric phase of NaNO2. Our results show that th...
Adsorption of Te on Ge(001): Density-functional calculations
Cakmak, M; Srivastava, GP; Ellialtıoğlu, Süleyman Şinasi (American Physical Society (APS), 2003-05-15)
We present ab initio density-functional calculations for the adsorption of Te on the Ge(001) surface. Various possible adsorption geometries for the 0.5-, 0.8-, 1-, and 2-ML (monolayer) coverages of Te have been investigated. Our results for sub-monolayer coverages confirm earlier results as well as provide some new insight into the adsorption of Te. Furthermore, our results for the 2-ML coverage of Te suggest that the bonding between the overlayer and the substrate has changed significantly. This may provi...
Spectroscopy of B-c meson in a semi-relativistic quark model using the shifted large-N expansion method
Ikhdair, SM; Sever, Ramazan (2004-04-30)
We calculate the c (b) over bar mass spectrum, the splitting values and some other properties in the framework of the semirelativistic equation by applying the shifted large-N expansion technique. We use seven different central potentials together with an improved QCD-motivated interquark potentials calculated to two loops in the modified minimal-subtraction ((MS) over bar) scheme. The parameters of these potentials are fitted to generate the semirelativistic bound states of c (b) over bar quarkonium system...
Calculation of optimized parameters of rectangular microstrip patch antenna using particle swarm optimization
Yilmaz, A. Egemen; Kuzuoğlu, Mustafa (Wiley, 2007-12-01)
In this letter, the particle swarm optimization has been applied to calculate the optimized length and width of rectangular inicrostrip antennas. The inputs to the problem are the dielectric constant and thickness of the substrate; together with the desired resonant frequency; the outputs arc the optimized length and width; where the antennas are considered to be electrically thin. The results are in good agreement with the results (experimental and calculated by other heuristics) in the literature. (C) 200...
Calculation of the T-P Phase Diagrams for the Halogenomethane Compounds (CCl4-nBrn, n=0, 1, 2, 4) Using the Mean Field Theory
Yurtseven, Hasan Hamit; Dogan, E. Kilit (Pleiades Publishing Ltd, 2019-02-01)
The T-P phase diagrams of the halogenomethane compounds (CCl4-nBrn, n = 0, 1, 2, 4) are calculated using a mean field model. By expanding the free energy in terms of the order parameters for the transitions of the liquid (L), rhombohedral (R), face-centered cubic (FCC) and monoclinic (M) phases in those compounds, the phase line equations are derived and they are fitted to the experimental data from the literature. This method of calculating the T-P phase diagram is satisfactory to explain the T-P measureme...
Citation Formats
E. Kilit and H. H. Yurtseven, “Calculation of the dielectric constant as a function of temperature near the smectic AC* phase transition in ferroelectric liquid crystals,” FERROELECTRICS, pp. 288–300, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35401.