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Critical Behaviour of the Heat Capacity Near the alpha-beta Phase Transition in Quartz
Date
2013-04-01
Author
Yurtseven, Hasan Hamit
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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.
Subject Keywords
Physical and Theoretical Chemistry
,
General Materials Science
,
Mechanics of Materials
,
Condensed Matter Physics
URI
https://hdl.handle.net/11511/37513
Journal
HIGH TEMPERATURE MATERIALS AND PROCESSES
DOI
https://doi.org/10.1515/htmp-2012-0038
Collections
Department of Physics, Article
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Calculation of the Raman Linewidths of Lattice Modes Close to the alpha-beta Transition in Quartz
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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.
Calculation of the Specific Heat Close to Phase Transition in S-triazine
KURT, MUSTAFA; Yurtseven, Hasan Hamit (Walter de Gruyter GmbH, 2009-01-01)
The specific heat C-V as a function of temperature has been calculated using the quasi-harmonic and mean field approximation for s-triazine close to the transition temperature (T-C=198 K). Using the parameters for the shear strain angle (order parameter) fitted to the observed Raman frequencies of the four bands, the specific heat C-V is calculated from the free energy of s-triazine.
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).
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.
Pippard relation modified for the rotatory lattice mode in ammonia solid II
Yurtseven, Hasan Hamit (Walter de Gruyter GmbH, 2005-01-01)
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...
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H. H. Yurtseven, “Critical Behaviour of the Heat Capacity Near the alpha-beta Phase Transition in Quartz,”
HIGH TEMPERATURE MATERIALS AND PROCESSES
, pp. 189–194, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37513.