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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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Date
2016-06-15
Author
Yurtseven, Hasan Hamit
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We study the temperature dependence of the heat capacity C-p for the pure CH4 and the coadsorbed CH4/CCl4 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 CH4 (T-m = 104.8 K) and CH4/CCl4 (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 CH4/CCl4 is of first order (apparent discontinuity in Cp). We also study the T - X phase diagram of a two-component system of CH3CCl3+CCl4 using the Landau phenomenological model. Phase lines of the R+L (rhombohedral+liquid) and FCC+L (face-centred 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 CH3CCl3+CCl4 adequately. From the calculated T - X phase diagram, critical behavior of some thermodynamic quantities can be predicted at various temperatures and concentrations (CCl4) for a binary mixture of CH3CCl3+CCl4.
Subject Keywords
Heat capacity
,
CH4 and CH4 /CCl4x
,
Melting point
,
T–X phase diagram
,
CH3CCl3+CCl4
URI
https://hdl.handle.net/11511/36530
Journal
FRONTIERS IN PHYSICS
DOI
https://doi.org/10.3389/fphy.2016.00024
Collections
Department of Physics, Article
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H. H. Yurtseven, “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,”
FRONTIERS IN PHYSICS
, pp. 0–0, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36530.