Hasan Hamit Yurtseven

E-mail
hamit@metu.edu.tr
Department
Department of Physics
Scopus Author ID
Web of Science Researcher ID
Calculation of the phase diagram of n-alkanes (CnH2n+2) by the Landau mean field theory
Yurtseven, Hasan Hamit; Kilit Dogan, E. (2022-05-01)
We study the temperature T and concentration n (number of carbon atoms) dependence on the transitions of the liquid, rotator (RI, RII,RIII,RIVand RV) and crystal phases in n-alkanes (CnH2n+2). The Landau phenomenological m...
Calculation of the T-X phase diagram for the first-order smectic-hexatic transitions in binary mixtures
Kilit Dogan, E.; Yurtseven, Hasan Hamit (2022-04-01)
© 2022 Author(s).This work gives the T-X phase diagram calculated from the Landau mean field model for the smectic-hexatic transitions in binary mixtures, particularly, in THI-13+THI-17. It is calculated near the SmC-SmF (...
Magnetic transitions in two novel mixed-valence iron(II)–iron(III) metal formate frameworks: Two sublattice model
Yurtseven, Hasan Hamit; Tari, O. (2022-03-15)
We study the two-sublattice model in the mean field theory by expanding the Gibbs free energy in terms of the magnetizations M1 (Mup) and M2 (Mdown) with the quadratic coupling M12M22 (quadrupolar interactions) for the ord...
Magnetic, thermal and ferroelectric properties of MOFs (MHyM, M = Fe, Mn) close to phase transitions
Kilit Dogan, E.; Yurtseven, Hasan Hamit (2021-12-15)
Magnetic, thermal and ferroelectric properties of MOFs (metal organic frameworks), in particular, the compounds CH3NH2NH2M(HCOO)3 (MHyM) with M = Fe and Mn, are studied close to phase transitions. For the magnetic properti...
Calculation of the Liquid-Solid Phase Diagram and the Thermodynamic Quantities of the Binary System of Tetradecane and Hexadecane Using the Mean Field Theory
Yurtseven, Hasan Hamit; Tari, O. (2021-10-01)
The T - x phase diagram of a binary system of tetradecane + hexadecane is calculated using the Landau phenomenological model. Expressions derived for the phase lines are fitted to experimental data from the literature and ...
Landau phenomenological model for the alpha-INC (incommensurate)-beta transition in quartz
Yurtseven, Hasan Hamit (2021-08-01)
The temperature dependence of the order parameters eta (alpha-phase) and xi (INC - incommensurate phase) are calculated in the presence of the electric field for the alpha-INC-beta transition in quartz by the Landau mean f...
Calculation of the Relaxation Time and the Activation Energy Close to the Lower Phase Transition in Imidazolium Perchlorate
Yurtseven, Hasan Hamit (2021-08-01)
The temperature dependence of the relaxation time of imidazolium perchlorate (Im-ClO4) was calculated from the pseudospin-phonon coupled (PS) and the energy fluctuation (EF) models close to the first-order phase transition...
Investigation of vibrational, elastic and dielectric properties of cubic gauche nitrogen (cg-N)
Akay, Ö.; Yurtseven, Hasan Hamit (2021-06-01)
Vibrational, elastic and dielectric properties of the cubic gauche nitrogen (cg-N) are investigated by analyzing the Raman optic and zone-center phonon modes using the literature data. From the pressure dependence of those...
Calculation of the damping constant and the relaxation time of the LA mode in the incommensurate phase of quartz
Ates, S.; Yurtseven, Hasan Hamit (2021-04-01)
The damping constant (linewidth) of the LA mode is calculated as a function of temperature for the incommensurate (INC) phase of quartz by using the models of the pseudospin-phonon (PS) coupled and the energy fluctuation (...
Phenomenological approaches on the Nd3+ doped ferroelectric LaBGeO5
Kara, N.; Kiraci, A.; Yurtseven, Hasan Hamit (2021-02-01)
Two phenomenological models, namely the compressible Ising model and Landau model, have been used to analyze the specific heat and the dielectric constant data, respectively for the pure and Nd3+ doped LaBGeO5 (LBG) crysta...
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