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Orientational Correlations in Plastic Crystals by X-ray Scattering and Neutron Spin Echo Method

Research Project

Project/Area Number 04452044
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 固体物性
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

ACHIWA Norio  KYUSHU UNIV.PHYSICS Professor, 理学部, 教授 (60027456)

Co-Investigator(Kenkyū-buntansha) SHIONO Masaaki  KYUSHU UNIV.PHYSICS Research Associate, 理学部, 助手 (80235499)
Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1993: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1992: ¥3,900,000 (Direct Cost: ¥3,900,000)
Keywordsplastic crystal / orientational glass / orientational correlation / time resolved X-ray / progressive correlation / neutron inelastic scattering / molecular rotation / relaxation process in glass / 時間進行X線回析 / プラスチック(柔粘性)結晶 / アダマンタン誘導体 / 配向グラス結晶 / フレンケルモデル / 配向相関 / X線散漫散乱 / ブロモアダマンタン / 分子配向 / 分子回転運動 / マキシマムエントロピー / 電子密度分布 / 中性子非干渉性準弾性散乱 / かご分子
Research Abstract

Three big subjects for plastic crystal of adamantane derivatives in order to study molecular orientational correlations and dynamics of the plastic and orientational glass phases.
(1) The crystal structures of all the three different (III-order, II-semi-order, I-plastic) phases of 1-bromoadamantane C_<10>H_<15>Br have been determined by means of X-ray diffraction technique. Observed structure factors in the I phase were compared with calculated ones which were derived by the simplified model : a spherically oriented adamantane plus oriented Br atoms along six equivalent cubic <100> axs. The relations between phase transitions and orientations of the molecular axis are discussed in three phases. The sequence of the phases I,II and III is characterized as the step by step ordering of disordered molecular orientations along the equivalent six cubic <100> axs. In the I-plastic phase X-ray diffuse scattering due to nearly free molecular rotation was observed both for powdered and single crys … More tals.
(2) Inter-molecular orientational correlations have been studied in a plastic phase and a orientationally glassy phase of 1-cyanoadamantane by observing patterns of diffuse scattering on a single crystal. The obtained patterns of the diffuse scattering are compared with simulations based on Monte Carlo method supposing that orientations of the molecular axis are randomly distributed six equivalent <100> directions of the fcclattice.
(3) Progressive molecular orientational ordering on single crystal of 1-cyanoadamantane just below the glass transition temperature have been studied by a time resolved X-ray scattering technique. Time evolution of profiles of Bragg reflections and that of diffuse scattering in various reciprocal lattice points of the fcc structure were measured. The results demonstrate the evolution process of local ordering of molecular orientations in the mother glassy phase. After aging 3 days, we found new diffusive scattering around (2,1<plus-minus>delta, 0) (delta-1/2). Through every processes the cubic symmetry of the single crystal was preserve Less

Report

(4 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 高倉 洋礼: "プラスチック結晶1-ブロモアダマンタンの分子配向" 九州大学中央分析センター報告. 10. 41-49 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Takakura: "Phase transition and crystal structures in 1-Br-Adamantane" AsCA'92(The inaugural conference of the Asian crystallographic Association. 15B-1 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Takakura: "Molecular orientation in plastic crystal of 1-bromoadamantane" Acta Cryst.A 49 Supl.PS12.02.09. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] N.Achiwa,: "Neutron optics using transverse neutron spin echo method." Proceedings of the 5-th international symposium on advanced nuclear energy-research. JAERI-M 93-228. vo12 p-304,738-743. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Takakura, N.Achiwa and M.Shiono: "Phase transition and crystal structures in 1-Br-Adamantance." AsCA'92 (The inaugural conference of the Asian Crystallographic Association. 15B-1. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Takakura, M.Shiono and N.Achiwa: "Molecular orientations of plastic crystal 1-Br-Adamantane." Report of the center of advanced instrumental analysis kyushu university. 10. 41-49 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Takakura, M.Shiono and N.Achiwa: "Molecular orientations in plastic crystal of 1-bromoadamantane." Acta Cryst. A 49 Supl.(PS 12.02.10.). (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] N.Achiwa, M.Hino, S.Tasaki, T.Ebisawa and T.Akiyoshi: "Neutron optics using transverse neutron spin echo method." Proceedings of the 5-th international symposium on advanced nuclear energy research. JAERI-M 93-228 vo12. 304,738-743 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 高倉 洋礼: "プラスチック結晶1-プロモアダマンタンの分子配向" 九州大学中央分析センター報告. 10. 41-49 (1992)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Takakura: "Phase transition and crystal structures in 1-Br-Adamantane" AsCA'92(The inaugural conference of the Asian Crystallographic Assoclation. 15B-1 (1992)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Takakura: "Molecular orientation in plastic crystal of 1-bromoadamantane" Acta Cryst.A 49 Supl.PS12.02.09. (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Takakura: "Phase transition and crystal structures in 1-Br-Adamantane" AsCA′92(The inaugural conference of Asian Crystallographic Association. 15B-1- (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Takakura: "Molecular orientation in plastic crystal of 1-bromoadamantane" Acta Cryst.A 49 Supl.PS12.02.09 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 高倉 洋礼: "プラスチック結晶1-ブロモアダマンタンの分子配向" 九州大学中央分析センター報告. 10. 41-49 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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