Pippard relation modified for the rotatory lattice mode in ammonia solid II

Date

2005-01-01

Author

Yurtseven, Hasan Hamit

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In this study we obtain a linear variation of the specific heat Cp with the Raman frequency shifts 1/v (partial derivative v/partial derivative T)p for the rotatory lattice (librational) mode in the ammonia solid II near the melting point. From this linearity, we deduce values of the slope dP(m)/dT for the pressures of 3.65, 5.02 and 6.57 kbars in the ammonia solid II. Our calculated value of dP(m)/dT for the pressure of 3.65 kbar, is in good agreement with the experimentally measured value in the P-T phase diagram of this crystalline system. This indicates that the first Pippard relation modified for the rotatory lattice mode in the ammonia solid II, is satisfactory near the melting point.

Subject Keywords

Physical and Theoretical Chemistry, General Materials Science, Mechanics of Materials, Condensed Matter Physics

URI

https://hdl.handle.net/11511/37534

Journal

HIGH TEMPERATURE MATERIALS AND PROCESSES

DOI

https://doi.org/10.1515/htmp.2005.24.5.315

Collections

Department of Physics, Article

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Temperature Dependence of The Raman Frequency Shifts Related to The Specific Heat and Thermal Expansion Close To I-II Phase Transition in S-Triazine. KURT, MUSTAFA; Yurtseven, Hasan Hamit (Walter de Gruyter GmbH, 2010-01-01) A linear variation of the specific heat C-p with the frequency shifts 1/omega(partial derivative omega/partial derivative T)(p) is established for the Raman modes I-V at various temperatures (P=0) close to I-II phase transition in s-triazine (T-c=198 K).
Critical Behaviour of the Heat Capacity Near the alpha-beta Phase Transition in Quartz Yurtseven, Hasan Hamit (Walter de Gruyter GmbH, 2013-04-01) The alpha-beta transition ( T-Q = 578 degrees C) is studied in quartz by analyzing the experimental heat capacity C-p data taken from the literature, using a power-law formula. Values of the critical exponent alpha for C-p are extracted below and above T-Q, which describe the alpha-beta transition as a second order transition in quartz. The alpha values obtained here are compared with the predictions of the theoretical models.
Calculation of the Raman Linewidths of Lattice Modes Close to the alpha-beta Transition in Quartz Lider, Mustafa Cem; Yurtseven, Hasan Hamit (Walter de Gruyter GmbH, 2012-12-01) The Raman frequencies of the lattice modes (147 cm(-1) and 207 cm(-1)) are analyzed for the alpha-beta transition in quartz according to a power-law formula with the critical exponent by using the experimental data. The temperature dependence of the Raman frequency is associated with the order parameter (polarization P) for this transition in the quartz crystal.
Raman Study of Solid Nitrogen in the beta Phase and Close to the Melting Line Iseri, E. Cetinbas; Yurtseven, Hasan Hamit (Walter de Gruyter GmbH, 2013-02-01) This study gives the Raman frequencies calculated as functions of temperature and pressure for the lattice modes in the solid beta phase and close to the melting line (beta-fluid transition). The experimental volume data from the literature is used to calculate the Raman frequencies for the molecular nitrogen system. Some observed Raman frequencies are also used as the initial data to perform our calculations given here.

Citation Formats

H. H. Yurtseven, “Pippard relation modified for the rotatory lattice mode in ammonia solid II,” HIGH TEMPERATURE MATERIALS AND PROCESSES, pp. 315–322, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37534.