Calculation of the Raman frequencies of lattice modes in the disordered phase II of NH4Br at high pressures

Date

2010-01-01

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

173
views

0
downloads

The Raman frequencies are calculated here at various temperatures for the nu(7) (56 cm(-1)) and nu(5) (134 cm(-1)) lattice modes in the disordered phase II of NH4Br. The lattice parameter data obtained at zero pressure are used to calculate the Raman frequencies of those modes studied for constant pressures of 0.1, 108, and 637.5 MPa in phase II of the NH4Br crystal. Through the mode Gruumlneisen parameter which is kept constant in the disordered phase II, the Raman frequencies calculated decrease linearly with increasing temperature at all fixed pressures for both lattice modes of NH4Br. Measurements of the Raman frequencies for the lattice modes of interest can be conducted to examine our calculations under the temperature and pressure variations given here for NH4Br. (C) 2010 Physics Essays Publication. [DOI: 10.4006/1.3504860]

Subject Keywords

General Physics and Astronomy

URI

https://hdl.handle.net/11511/40076

Journal

PHYSICS ESSAYS

DOI

https://doi.org/10.4006/1.3504860

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Calculation of the infrared frequency and the damping constant (full width at half maximum) for metal organic frameworks Kurt, M.; Yurtseven, Hasan Hamit; Kurt, Aygül; Aksoy, S. (IOP Publishing, 2019-06-01) The rho(NH2) infrared (IR) frequencies and the corresponding full width at half maximum (FWHM) values for (CH3)(2)(NH2FeMII)-M-III(HCOO)(6) (DMFeM, M = Ni, Zn, Cu, Fe, and Mg) are analyzed at various temperatures by using the experimental data from the literature. For the analysis of the IR frequencies of the rho(NH2) mode which is associated with the structural phase transitions in those metal structures, the temperature dependence of the mode frequency is assumed as an order parameter and the IR frequenci...
Analysis of the orientational order parameter and the magnetic field as functions of temperature for p-anisaldazine Yurtseven, Hasan Hamit (Korean Physical Society, 2016-06-01) We analyze in this study the orientational order parameter and the magnetic field as functions of temperature close to the nematic-isotropic liquid (NI) transition in anisaldazine. The experimental data from the literature are analyzed by using a power-law formula for both the orientational order parameter and the magnetic field, and the critical exponents are deduced. In particular, the mean field value of beta = 0.5 for the critical exponent of the orientational order parameter is used, and the power-law ...
Modelling of non-uniform DC driven glow discharge in argon gas Rafatov, İsmail; BILIKMEN, S. (Elsevier BV, 2007-07-16) Physical properties of non-uniform DC-driven glow discharge in argon at pressure 1 torr are analyzed numerically. Spatially two-dimensional axial-symmetric model is based on the diffusion-drift theory of gas discharge. Results presented compare favorably with the classic theory of glow discharges and exhibit good agreement with the experimental result. Comparison with the result of spatially one-dimensional model is performed. (c) 2007 Elsevier B.V. All fights reserved.
Calculation of the tilt angle and susceptibility as functions of temperature and the electric field close to the Sm A - Sm C* transition in C7 AKSOY, SERKAN; Yurtseven, Hasan Hamit; KURT, MUSTAFA (Canadian Science Publishing, 2018-07-01) Smectic A - Smectic C* transition in the ferroelectric liquid crystal (C7) is studied as a function of the electric field and the temperature. By expanding the free energy in terms of the tilt angle theta (Smectic C* phase) and the polarization P with a linear coupling between theta and P (P theta) in mean field theory, the tilt angle is calculated as a function of the electric field (theta versus E) at constant temperatures with respect to the transition temperature for C7 using the observed data from the ...
Calculation of the specific heats for the II-III and II-IV phase transitions in NH4I Yurtseven, Hasan Hamit (IOP Publishing, 2003-01-01) wThis study gives our calculation for the specific heats C-VI due to an Ising model using the observed C-P data for the II-III and II-IV phase transitions in NH4I. By fitting to the Cp data we determine the values of the critical exponent for the pressure of 0.14 GPa (II-III phase transition) and for the pressures of 0.75, 1.35 and 1.97GPa (II-IV phase transition) in NH4I. Our exponent values are close to the predicted values of the specific heat in a three-dimensional Ising model. Our calculated C-VI are i...

Citation Formats

H. H. Yurtseven, “Calculation of the Raman frequencies of lattice modes in the disordered phase II of NH4Br at high pressures,” PHYSICS ESSAYS, pp. 608–612, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40076.