CALCULATION OF THE RAMAN FREQUENCIES AT LOW PRESSURES AND TEMPERATURES (sigma-PHASE) SOLID NITROGEN

Date

2013-09-20

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

77
views

0
downloads

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 frequencies can be calculated as a function of temperature at some other constant pressures.

Subject Keywords

Statistical and Nonlinear Physics, Condensed Matter Physics

URI

https://hdl.handle.net/11511/38722

Journal

INTERNATIONAL JOURNAL OF MODERN PHYSICS B

DOI

https://doi.org/10.1142/s0217979213501257

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

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 HEAT CAPACITY AND GLASS TRANSITION IN AMORPHOUS ICE Yurtseven, Hasan Hamit (World Scientific Pub Co Pte Lt, 2010-07-10) We analyze the heat capacity C(P) for low and high-density amorphous ice below the transition temperature (T(C) approximate to 140 K) using a power-law formula. The renormalized critical exponent alpha(R) is extracted from the observed C(P) data, which describes similar critical behavior for both low and high-density amorphous ice below T(C). Our analysis can also describe a glass transition in the low-density amorphous ice which is made from the high-density amorphous ice at 124 K, as observed experimentally.
CALCULATION OF VOLUME AS FUNCTIONS OF TEMPERATURE AND PRESSURE IN ICE I CLOSE TO THE MELTING POINT Kilit, E.; Yurtseven, Hasan Hamit (World Scientific Pub Co Pte Lt, 2010-07-30) We calculate in this study the volume of ice I as functions of temperature and pressure close to the melting point by analyzing the experimental data for the thermal expansivity. Using an approximate relation, the temperature dependence of the volume is calculated at 202.4 MPa from the thermal expansivity of ice I. The pressure dependence of the volume is also calculated at 252.3 K from the isothermal compressibility of ice I close to the melting point.
DETERMINATION OF TRAPPING CENTER PARAMETERS OF Tl2Ga2S3Se LAYERED CRYSTALS BY THERMALLY STIMULATED CURRENT MEASUREMENTS YILDIRIM, TACETTİN; Nasser, H. A.; Hasanlı, Nızamı (World Scientific Pub Co Pte Lt, 2010-06-10) We have carried out thermally stimulated current (TSC) measurements on as-grown Tl2Ga2S3Se layered single crystals in the temperature range 10-60 K with different heating rates of 0.6-1.5 K s(1). The data were analyzed by curve fitting, initial rise, and peak shape methods. The results were in good agreement with each other. Experimental evidence was obtained for trapping center in Tl2Ga2S3Se crystal with activation energy of 11 meV. The capture cross section and concentration of the traps were found to be ...
Calculation of the specific heat for the first order phase transition in NH4Br Yurtseven, Hasan Hamit; Sherman, WF (World Scientific Pub Co Pte Lt, 1998-11-01) We calculate in this work the specific heat C-VI using the predictions of an Ising model for the NH4Br crystal (T-C = 234 K, P = 0). Our calculated C-VI values are in good agreement with the experimentally observed C-p data from the literature. This shows that the observed behavior of NH4Br can be described adequately in the lattice region under an Ising model studied here.

Citation Formats

H. H. Yurtseven, “CALCULATION OF THE RAMAN FREQUENCIES AT LOW PRESSURES AND TEMPERATURES (sigma-PHASE) SOLID NITROGEN,” INTERNATIONAL JOURNAL OF MODERN PHYSICS B, pp. 0–0, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38722.