Intermolecular Potentials and Phase Diagrams
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概要
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A density functional theory of freezing combined with a thermodynamically consistent integral equation method is used to investigate the phase behaviour of the systems interacting via the m-n potential with m=2n, φ(r)=4ε[(σ/r)^<2n>-(σ/r)^n] (n=6, 8, l0 and 12), and the rigid C_<60> molecules interacting via the Girifalco potential. It is found that the liquid-vapour coexisting region is gradually suppressed as the attractive part of the potential becomes short-range with increasing n and the coexistence ceases to occur at n⋍11. The m-n potential with n=11〜12 is similar to the Girifalco potential and both yield similar phase diagrams. It is also found that the phase diagram of C_<60> calculated for a truncated potential is qualitatively in agreement with the corresponding Monte Carlo (MC) simulations of Hagen et al., which have predicted nonexistence of the liquid phase in contrast to the molecular dynamics (MD) simulations of Cheng et al. These results suggest the importance of treating the long-range tail of the potential correctly and provide a partial explanation for the discrepancy between the MC and MD simulations.phase diagramfreezingdensity functional theoryC_<60>solid-liquid transition
- 東北大学の論文
- 1997-03-20
著者
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Ohno Kaoru
Institute for Materials Research
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HASEGAWA Masayuki
Department of Physics, Faculty of Science, Tohoku University
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Hasegawa Masayuki
Department Of Materials Science And Technology Faculty Of Engineering Iwate University
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