X-Ray Diffuse Scattering in Cubic Adamantane (C<sub>10</sub>H<sub>16</sub>)

  • Yamamoto Seishi
    Department of Physics, Faculty of Science, Yamaguchi University, Yamaguchi 753
  • Hosokawa Tomoko
    Department of Physics, Faculty of Science, Yamaguchi University, Yamaguchi 753

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タイトル別名
  • X-Ray Diffuse Scattering in Cubic Adamantane (C10H16).
  • X Ray Diffuse Scattering in Cubic Adama

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X-ray diffuse scatterings are observed in cubic adamantane (C10H16) around X-points and Z-lines in the Brillouin zone boundary. The intensity of the diffuse maximum at the X-point increases with decreasing temperature. Diffuse intensity distribution is analyzed with the molecular field approximation in the Ising system. Cubic-tetragonal phase transition is explained by the instability of the orientational fluctuation with a wave vector q=(0, , 0, , 2π/a): X-point. Short-range interaction between the first neighbouring molecules plays a dominant role in this phase transition.

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