Theory of Phase Transitions in Solid Methanes.VIII : Anomalous Thermal Expansion in Solid CH_4
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概要
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The effects of rotational ordering on the thermal expansion in solid CH_4 are studied on the basis of the quantum-statistical mechanics of the James-Keenan model. We assume that solid methane is an equilibrium mixture of nuclear spin species. Then it is shown that the thermal expansion coefficient becomes negative below 11K, in agreement with experiment. This is understood as a direct result of interspecies conversion. As the temperature is lowered, more and more molecules convert into species A, so that the rotational ordering tends to be destroyed and thus its effect of squeezing the lattice is weakened. The anomaly just below the transition temperature is also discussed.
- 理論物理学刊行会の論文
- 1971-04-25
著者
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Kataoka Yosuke
Department Of Chemistry Faculty Of Science Kyoto University
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YAMAMOTO Tsunenobu
Department of Chemistry, Faculty of Science Kyoto University
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Yamamoto Tsunenobu
Department Of Chemistry Faculty Of Science Kyoto University
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Kataoka Yosuke
Department Of Chemical Science And Technology Faculty Of Bioscience And Applied Chemistry Hosei Univ
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