Calculation of the Specific Heat Close to Phase Transition in S-triazine

Yurtseven, Hasan Hamit
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.


Calculation of the Spontaneous Polarization and the Dielectric Constant for the Ferroelectric N(CH3)(4)HSO4 Using the Mean Field Model
Yurtseven, Hasan Hamit; KARACALİ, HUSEYİN (Walter de Gruyter GmbH, 2017-10-01)
The temperature dependences of the spontaneous polarization and the dielectric constant (susceptibility) are calculated using themean fieldmodel for the ferroelectric N(CH3)(4)HSO4. Expressions derived from the mean fieldmodel for the spontaneous polarization and the inverse susceptibility are fitted to the experimental data from the literature. The fitting parameters in the expansion of the free energy in terms of the spontaneous polarization are determined within the temperature intervals in the ferroelec...
Analysis of the Raman Frequency Shifts for the Lattice Modes and Vibrons Related to the Thermodynamic Quantities in the eta Phase of Solid Nitrogen
Yurtseven, Hasan Hamit (Walter de Gruyter GmbH, 2013-08-01)
The thermodynamic quantities of the isothermal compressibility, thermal expansion and the specific heat are calculated here as a function of pressure by using the observed Raman frequencies of the lattice modes and vibrons in the. phase of solid nitrogen. The Pippard relations and their spectroscopic modifications are constructed, and the slope dP/dT is deduced from the Raman frequency shifts in this phase of N-2. It is shown that the thermodynamic quantities can be predicted from the Raman frequency shifts...
Calculation of molar volume as a function of temperature close to the melting point in benzene
Yurtseven, Hasan Hamit (Walter de Gruyter GmbH, 2007-01-01)
We study here the temperature dependence of the molar volume for constant pressures in benzene close to the melting point. By analyzing the experimental data for the thermal expansivity at various pressures in benzene, we calculate the molar volumes as functions of temperature in this system. Our calculations show that discontinuities in the molar volume decrease as the melting temperatures increase along the melting line when the constant pressures vary from 70.5 MPa to 175.2 MPa, as also observed experime...
Analysis of the specific heat of p-azoxyanisole (PAA) near the phase transitions
Kilit, E.; Yurtseven, Hasan Hamit (Informa UK Limited, 2010-01-01)
The analysis of the experimental data for the specific heat Cp at various temperatures is given here near the nematic-isotropic liquid (TNI = 133.9 degrees C) and the solid-nematic (TSN = 117.6 degrees C) transitions in p-azoxyanisole (PAA). The analysis of the specific heat Cp is performed according to a simple power-law formula and a renormalisation-group expression. The values of the critical exponent are extracted above and below the transition temperatures of TNI and TSN for this liquid crystalline mat...
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.
Citation Formats
M. KURT and H. H. Yurtseven, “Calculation of the Specific Heat Close to Phase Transition in S-triazine,” HIGH TEMPERATURE MATERIALS AND PROCESSES, pp. 217–222, 2009, Accessed: 00, 2020. [Online]. Available: