Calculation of the thermodynamic quantities of perovskite metal organics DMAKCr and perovskite HyFe close to the weakly first-order relaxor-like structural transformation using the mean field theory

Date

2019-04-30

Author

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

235
views

0
downloads

Weakly first-order or nearly second-order phase transitions occurring in metal{organic frameworks (MOFs), particularly in DMAKCr and perovskite HyFe, are studied under the mean field model by using the observed data from the literature. In this work, mainly thermal and magnetic properties among various physical properties which have been reported in the literature for those MOFs are studied by the mean field theory. By expanding the free energy in terms of the magnetization (order parameter), the excess heat capacity (Delta C-P) and entropy (Delta S), latent heat (L), magnetization (M) and the inverse susceptibility (chi(-1)) are calculated as a function of temperature close to the weakly first-order phase transition within the Landau phenomenological model which is fitted to the experimental data from the literature for C-P (DMAKCr and perovskite HyFe) and for magnetization M (HyFe).

Subject Keywords

Statistical and Nonlinear Physics, Condensed Matter Physics

URI

https://hdl.handle.net/11511/38296

Journal

INTERNATIONAL JOURNAL OF MODERN PHYSICS B

DOI

https://doi.org/10.1142/s0217979219501030

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Analysis of the peak position and linewidth as a function of temperature for the phase transitions in LiKSO4 Yurtseven, Hasan Hamit (World Scientific Pub Co Pte Lt, 2016-02-20) Analysis of the peak position and the linewidths of various infrared modes is performed at high (300-850 K) and low (1.5-300 K) temperatures using the experimental data from the literature for LiKSO4 which exhibits a sequence of phase transitions. The temperature dependences of the frequency and the linewidth which are derived from the anharmonic self-energy are fitted to the observed peak positions and the linewidths of the S-O stretching modes (internal nu(3) modes at 1135 cm(-1) and at 1180 cm(-1)), peak...
Calculation of the tilt angle and susceptibility for the alpha-beta transition in quartz using a mean field model Yurtseven, Hasan Hamit; Ates, S. (World Scientific Pub Co Pte Lt, 2017-03-30) Tilt angle (order parameter) and the susceptibility are calculated as a function of temperature for the alpha-beta transition in quartz using a Landau phenomenological model. The tilt angle as obtained from the model is fitted to the experimental data from the literature and the temperature dependence of the tilt angle susceptibility is predicted close to the alpha-beta transition in quartz. Our results show that the mean field model explains the observed behavior of the alpha-beta phase transition in quart...
CALCULATION OF THE DAMPING CONSTANT AND ACTIVATION ENERGY FOR RAMAN MODES IN (NH4)(2)SO4 Yurtseven, Hasan Hamit; Kiraci, A. (World Scientific Pub Co Pte Lt, 2011-06-20) The temperature dependence of the damping constant is calculated for various Raman modes in (NH4)(2)SO4 by the expressions derived from the soft mode hard mode coupling model and the energy fluctuation model. The expressions for the damping constant are fitted to the measured Raman bandwidths and then the activation energies are extracted, which are equal to similar to 0.2 eV for the Raman modes studied. The damping constant of a soft mode is also calculated and the activation energy (similar to 0.1 eV) is ...
ANALYSIS OF THE FREQUENCY SHIFT AND THE LINEWIDTH AS A FUNCTION OF TEMPERATURE IN SOLID NITROGEN KURT, MUSTAFA; Yurtseven, Hasan Hamit (World Scientific Pub Co Pte Lt, 2011-10-30) The temperature dependence of the frequency shift and the linewidth is studied using the expressions derived from the anharmonic self-energy. The functional form of the frequency shift is fitted in this study to the experimental data for the R(1) fluorescence line of ruby sample as a function temperature at zero pressure, instead of using empirical nu-P and nu-T relations in the ruby fluorescence method as given in the literature, in particular, for the solid nitrogen. We also demonstrate in this study the ...
CALCULATION OF THE RAMAN FREQUENCIES AT LOW PRESSURES AND TEMPERATURES (sigma-PHASE) SOLID NITROGEN Yurtseven, Hasan Hamit (World Scientific Pub Co Pte Lt, 2013-09-20) We calculate the Raman frequencies of the E-g mode and, the low and high frequency T-g mode as a function of temperature at a constant pressure of 2.85 kbar in the alpha-phase of solid nitrogen. The Raman frequencies of those lattice modes are calculated using the volume data from the literature at various temperatures (2.85 kbar) for the alpha-phase of solid N-2 through the mode Gruneisen parameter. Our predicted Raman frequencies can be compared with the experimental data and by this method the Raman freq...

Citation Formats

H. H. Yurtseven, “Calculation of the thermodynamic quantities of perovskite metal organics DMAKCr and perovskite HyFe close to the weakly first-order relaxor-like structural transformation using the mean field theory,” INTERNATIONAL JOURNAL OF MODERN PHYSICS B, pp. 0–0, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38296.