Calculation of the thermodynamic functions using a mean field model for the fluid-solid transition in nitrogen

Date

2017-12-22

Author

Akay, Özge
Yurtseven, Hasan Hamit

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https://hdl.handle.net/11511/76066

Conference Name

23. Yoğun madde fiziği Ankara toplantısı, (22 Aralık 2017)

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Department of Physics, Conference / Seminar

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Calculation of the thermodynamic functions using a mean field model for the fluid-solid transition in nitrogen AKAY, Özge; Yurtseven, Hasan Hamit (Romanian Academy - Revue Roumaine De Chimie, 2020-05-01) Temperature and pressure dependence of the thermodynamic quantities are calculated using the Landau phenomenological model for the first order fluid-solid transition in nitrogen. This calculation is performed by fitting the phase line equation as derived from the mean field model to the observed T-P phase diagram of the fluid-solid transition in N2 from the literature. Our calculations show that the order parameter and the inverse susceptibility decrease whereas the entropy, heat capacity, thermal expansion...
Calculation of the P-T phase diagram of nitrogen using a mean field model Enginer, Y.; Algul, G.; Yurtseven, Hasan Hamit (2017-12-20) The P-T phase diagram is calculated at low and moderate pressures by obtaining the phase line equations for the transitions considered in nitrogen using the Landau phenomenological model. For some transitions, a quadratic coupling between the order parameters is taken into account in the expansion of free energies in terms of the order parameters. A quadratic function in T and P is fitted to the experimental P-T data from the literature and the fitted parameters are determined.
Calculation of the T-P phase diagram for oxygen using the mean field theory Yurtseven, Hasan Hamit (2015-12-01) T-P phase diagram of oxygen with the liquid and solid phases (alpha, alpha,(alpha) over tilde, beta, gamma and is an element of) is calculated using the mean field theory. By expanding the free energy in terms of the order parameter, the phase line equations are derived and they are fitted to the experimental T-P data from the literature.
Calculation of the inverse relaxation time and the activation energy as a function of temperature for the Raman modes close to the phase transitions in solid nitrogen Yurtseven, Hasan Hamit (Elsevier BV, 2021-02-01) The inverse relaxation time is calculated as a function of temperature for the transitions of alpha - beta (P = 0) and epsilon-delta(loc)-delta (at constant pressures) in the solid N-2. For this calculation, the observed data from the literature are used for the Raman frequency shifts and linewidths (FWHM) of the librational E-g mode (alpha - beta) and the internal modes of v(1) and v(2) (epsilon-delta(loc)-delta) in the nitrogen. From the temperature dependence of the inverse relaxation time, the activatio...
Calculation of the Raman frequency and linewidth of vibrons using anharmonic self energy model for the ε, δloc and δ phases in solid nitrogen Akay, Ö.; Yurtseven, Hasan Hamit (Elsevier BV, 2020-10-01) Temperature dependences of the Raman frequency shifts and linewidths of vibrons ν1, ν2 and ν22 are calculated from the anharmonic self energy in the ε, δloc (localized δ) and δ phases of solid nitrogen (P = 18.5 GPa). This is performed by fitting the expressions from the the anharmonic self energy to the experimental frequency and FWHM data for those vibrons from the literature. Our results show that the anharmonic self energy model can explain adequately the observed behavior of the Raman frequency and lin...

Citation Formats

Ö. Akay and H. H. Yurtseven, “Calculation of the thermodynamic functions using a mean field model for the fluid-solid transition in nitrogen,” presented at the 23. Yoğun madde fiziği Ankara toplantısı, (22 Aralık 2017), Türkiye, 2017, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/76066.