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Hamit Yurtseven,Ethem Kaya 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.11
We analyze in this study the orientational order parameter and the magnetic field as functions of temperature close to the nematic-isotropic liquid (NI) transition in anisaldazine. The experimental data from the literature are analyzed by using a power-law formula for both the orientational order parameter and the magnetic field, and the critical exponents are deduced. In particular, the mean field value of = 0.5 for the critical exponent of the orientational order parameter is used, and the power-law formula is fitted to the experimental data. Our fits and the values of the critical exponents for the temperature dependence of the orientational order parameter and the magnetic field indicate weak first-order transition, and they adequately describe the observed behavior of the nematic-isotropic liquid transition in anisaldazine.
Hamit Yurtseven,Önder Ça lar 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
The thermal expansivity αp is related to isothermal compressibility κT at various pressures for constant temperatures of 254.6, 274 and 297.5 K close to the melting pressure in ammonia solid III. By analyzing the experimental data for κT according to a power-law formula, a linear variation of αp with the κT is established here close to the solid-liquid transition in ammonia. Anomalous behavior of thermal expansivity αp and the isothermal compressibility κT near the melting pressure is indicative of the λ-type transition in ammonia solid III.
Hamit Yurtseven,Ye in Dildar 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.1
We calculate the thermal expansion α_p , isothermal compressibility κ_T and the specific heat, C_p-C_v, as a function of pressure using the observed V-P data at room temperature close to the III-IV phase transition in CCl_4. Calculated κ_T , α_p and Cp-Cv decrease as the pressure increases from phase III to phase IV in this molecular crystal system,as expected. On the basis of our calculations of the κ_T, α_p and C_p-C_v, the Pippard relations are established close to the III-IV phase transition in CCl_4, which can be verified experimentally.
Raman Frequencies Calculated at Various Pressures in Phase I of Benzene
Tari, Ozlem,Yurtseven, Hamit Korean Chemical Society 2013 대한화학회지 Vol.57 No.2
We calculate in this study the pressure dependence of the frequencies for the Raman modes of A ($A_g$), B ($A_g$, $B_{2g}$) and C ($B_{1g}$, $B_{3g}$) at constant temperatures of 274 and 294K (room temperature) for the solid phase I of benzene. Using the mode Gr$\ddot{u}$neisen parameter of each lattice mode, which correlates the pressure dependence of the crystal volume and the frequency, the Raman frequencies of those modes are computed for phase I of benzene. Our results show that the Raman frequencies of the three lattice modes (A, B and C) increase as the pressure increases, as expected. The temperature effect on the Raman frequencies is not significant, which can be explained by the experimental measurements.