Linear variations of the thermodynamic quantities in the liquid phase of carbon tetrachloride close to the melting point

Yurtseven, H.; Kavruk, D.

doi:10.1016/j.molliq.2007.11.010

Cited by 8 publications

(8 citation statements)

References 21 publications

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“…Since the molecule is crystallized by weak van der Waals force, many phases are produced through the different orientational arrangements of molecules in the crystal 1–8. In fact, the four crystalline phases of this molecular solid appearing at high pressure, from recent experimental and theoretical studies, are well known: under the compression of 0.13 GPa at room temperature (300 K), the liquid phase solidifies to the phase I, which is transformed into the phase II at 0.4 GPa (monoclinic, C 2/ c ) 9, 10 and into the phase III at 0.7 GPa (monoclinic, P 2 1 / c ) 11–13. The phase IV (cubic, Pa 3) was first pointed out by Braun 14 at temperatures above 520 K and pressures above 2.0 GPa.…”

Section: Introductionmentioning

confidence: 99%

Lowering the symmetry group of carbon tetrachloride by high pressure

Chen

Sun

et al. 2012

Physica Status Solidi (b)

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Using the pressure‐induced polarized Raman spectra of carbon tetrachloride up to 22 GPa, a significant anomalous polarization (the depolarization ratio >0.75) was observed. We analyzed it by evaluating the antisymmetric anisotropy distribution of modes in Td and explored the corresponded molecular structure having been translated from Td into a lower symmetry. The P21/c and Pa3 structures of carbon tetrachloride were optimized as a function of pressure to further confirm that the molecules deviated from regular tetrahedra. The C2v and D2 were analyzed to be candidates of the lower symmetry based on group and Landau theory.

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Section: Introductionmentioning

confidence: 99%

Lowering the symmetry group of carbon tetrachloride by high pressure

Chen

Sun

et al. 2012

Physica Status Solidi (b)

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“…The critical behavior of those thermodynamic quantities can be described by a power-law formula near the melting point and they can be correlated with each other linearly. By analyzing the experimental data for the thermal expansion at various pressures in CCl 4 [20], we have related α p to κ T and also the specific heat C p to α p (Pippard relations) near the melting point for the solid phase [21] and for the liquid phase [22] in this molecular crystal. We have also calculated the temperature and pressure dependence of the molar volume of CCl 4 close to the melting point in our recent study [23].…”

Section: Introductionmentioning

confidence: 99%

Calculation of thermodynamic quantities for carbon tetrachloride (CCl4) close to the III–IV phase transition

Yurtseven

Dildar

2010

Korean J. Chem. Eng.

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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 C p -C v 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.

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“…It has been observed experimentally that the thermodynamic quantities like the thermal expansion, isothermal compressibility, and the specific heat diverge as approaching the melting point in those molecular crystals, in particular, the thermal expansion of CCl 4 at various pressures diverges close to the melting point, as observed experimentally, which is closely a second order transition prior the melting [10]. By analyzing the experimental data for the thermal expansion [10], we have examined the Pippard relations [17][18][19] and we have calculated the molar volume [20] for CCl 4 in our earlier studies.…”

Section: Introductionmentioning

confidence: 78%

Analysis of the Heat Capacity for Pure CH4 and CH4/CCl4 on Graphite Near the Melting Point and Calculation of the T–X Phase Diagram for (CH3)CCl3+CCl4

Yurtseven

Yilmaz

2016

Front. Phys.

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We study the temperature dependence of the heat capacity C p for the pure CH 4 and the coadsorbed CH 4 /CCl 4 on graphite near the melting point. The heat capacity peaks are analyzed using the experimental data from the literature by means of the power-law formula. The critical exponents for the heat capacity are deduced below and above the melting point for CH 4 (T = m 104.8 K) and CH 4 /CCl 4 (T = m 99.2 K). Our exponent values are larger as compared with the predicted values of some theoretical models exhibiting second order transition. Our analyses indicate that the pure methane shows a nearly second order (weak discontinuity in the heat capacity peak), whereas the transition in coadsorbed CH 4 /CCl 4 is of first order (apparent discontinuity in C p ). We also study the T-X phase diagram of a two-component system of CH 3 CCl 3 +CCl 4 using the Landau phenomenological model. Phase lines of the R+L (rhombohedral + liquid) and FCC+L (face-centered cubic + liquid) are calculated using the observed T-X phase diagram of this binary mixture. Our results show that the Landau mean field theory describes the observed behavior of CH 3 CCl 3 +CCl 4 adequately. From the calculated T-X phase diagram, critical behavior of some thermodynamic quantities can be predicted at various temperatures and concentrations (CCl 4 ) for a binary mixture of CH 3 CCl 3 +CCl 4 .

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Linear variations of the thermodynamic quantities in the liquid phase of carbon tetrachloride close to the melting point

Cited by 8 publications

References 21 publications

Lowering the symmetry group of carbon tetrachloride by high pressure

Lowering the symmetry group of carbon tetrachloride by high pressure

Calculation of thermodynamic quantities for carbon tetrachloride (CCl4) close to the III–IV phase transition

Analysis of the Heat Capacity for Pure CH4 and CH4/CCl4 on Graphite Near the Melting Point and Calculation of the T–X Phase Diagram for (CH3)CCl3+CCl4

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