Statistical Theory of Hindered Rotation in Molecular Crystals

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概要

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• We propose a theory of hindered rotation in molecular crystals, whose basis is on the Kirkwood model. Some values characteristic of the phase trasition due to the molecular hindering are calculated. We obtained for the Curie point, He, 1.075, 0.615 and 0.434 for the square, simple cubic and body-centred lattices respectively, where we assumed J/2 cos γ, for the interaction between two neighbouring molecules, whose relative orientation is specified by γ, and we put H=J/2kT. The leap values of the specific heat, ΔC_v/R, are obtained as 2.280, 2.466 and 2.514 for the square lattice etc. In contrast with the theory of binary alloys, ΔC_v/R is not improved with compare to Bragg-Williams' value 2,500. It is different from Chang's result, according to which ΔC_v/R is larger than Bragg-Williams' value considerably. However Chang's point of view is criticized.

• 社団法人日本物理学会の論文
• 1952-06-25

著者

• Nakamura Tuto

  Physics Department Faculty Of Science Kyusyu University

関連論文

• Statistical Mechanics of Cooperative Phenomena
• Statistical Theory of Hindered Rotation in Molecular Crystals
• On the Spin Wave Theory of Magnetic Susceptibility and Resonance Absorption in Antiferromagnetics

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