Symmetry and features of structure in materials described in the space higher than three dimensions.

在高于三维的空间中描述材料的对称性和结构特征。

基本信息

  • 批准号:
    02302087
  • 负责人:
  • 金额:
    $ 1.09万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Co-operative Research (A)
  • 财政年份:
    1990
  • 资助国家:
    日本
  • 起止时间:
    1990 至 1991
  • 项目状态:
    已结题

项目摘要

This project has been carried out since the end of Oct. in 1990, and proceeded for 17 months. The results obtained in this period are as follows :1. the results by individual works of the members and by their cooperative works, and 2. the discussion meetings held in the above period with the investigators related to the proicclIn the former, three categories of studies have been carried out : (1) structural studies on incommensurate phases, studies on quasicrystals and on amorphous materials, (2) interpretation of feature of the structures and their properties in higher dimensions, and (3) studies on symmetries in the space higher than three dimensions. In category (1) , the structures of Ca_2CoSi_2O_7, of high Tc superconductors in Bi-oxide series and of zirconium titanates have been analyzed. As fundamental contributions, a computer program for structure determination of composite crystals was newly developed and a method to determine four-dimensional space group by convergent-beam e … More lectron diffraction was also established. Structures of quasicrystals in Al-Ni-Co and Al-Cu-Co systems were clarified by high-resolution electron microscopy and those in Al-Co-Ni and Al-Cu-Li systems were elucidated by X-ray diffraction method. The coordinations of transition metals in Ca (Mg, M) (Si, Al)_2O_6 (M : Mn, Fe, Co, Ni) glasses were studied by X-ray diffraction and EXAFS methods. A method to determine fluctuation of solutions by small angle X-ray diffraction was also established and was successfully applied to mixtures of alcoholic solutions and water. In category (2), a new concept "a graphical geodesic" was proposed. This was applied to characterize intrinsic regularity of the triangulated Penrose tilings which are closely related to the structures of qusicrystals. In (3), Studies on super space groups of composite crystals, on non-characteristic orbits of space groups, on statistics of point groups of crystals and on characters of packing of ellipses have been carried out.In the latter, the first discussion meeting was held in January, 1991, and the second one in February, 1992. The member of this project together with the investigators related to the project attended the meeting and the results of their studies were presented. The discussions were fruitful. Less
这个项目从1990年10月底开始,进行了17个月。这一时期的研究结果如下:1。2.成员个人工作和合作工作的结果;在上述期间与本专业相关研究者的讨论会议中,前者进行了三类研究:(1)不相称相的结构研究,准晶和非晶材料的研究,(2)高维结构特征及其性质的解释,(3)高维空间对称性的研究。在(1)类中,分析了Ca_2CoSi_2O_7、Bi-oxide系列高Tc超导体和钛酸锆的结构。作为基础性的贡献,新开发了测定复合晶体结构的计算机程序,并建立了用会聚束电子衍射法测定四维空间群的方法。用高分辨率电子显微镜分析了Al-Ni-Co和Al-Cu-Co体系的准晶结构,用x射线衍射法分析了Al-Co-Ni和Al-Cu-Li体系的准晶结构。用x射线衍射和EXAFS方法研究了Ca (Mg, M) (Si, Al)_2O_6 (M: Mn, Fe, Co, Ni)玻璃中过渡金属的配位。建立了用小角x射线衍射测定溶液波动的方法,并成功地应用于酒精溶液和水的混合物。在第(2)类中,提出了“图形测地线”的新概念。这一方法被用于表征与准晶体结构密切相关的三角彭罗斯瓷砖的内在规律性。在(3)中,对复合晶体的超空间群、空间群的非特征轨道、晶体的点群的统计量以及椭圆的填充特性进行了研究。在后者中,1991年1月举行了第一次讨论会,1992年2月举行了第二次讨论会。该项目的成员与该项目的相关调查人员出席了会议,并介绍了他们的研究结果。讨论富有成果。少

项目成果

期刊论文数量(6)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Ohmasa,M.,Hagiya,K.and Iishi,K.: "Structure of synthetic Coーakermanite." Acta Crystallographica. A46. C253 (1990)
Ohmasa, M.、Hagiya, K. 和 Iishi, K.:“合成 Coakermanite 的结构”。晶体学报 A46(1990)。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
M. Saito: "Space group determination of decagonal quasicrystals of an Al_<70>Ni_<50>Fe_<15> alloy using convergent-beam electron diffraction." Jpn. J. Appl. Phys.31. L109-L112 (1992)
M. Saito:“使用会聚束电子衍射确定 Al_<70>Ni_<50>Fe_<15> 合金的十方准晶的空间群。”
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
K.Ohsumi: "Development of a system to analyse the structure of a submicrometer-sized single crystal by synchrotron X-ray diffraction" J.Appl.Cryst.24. 340-348 (1991)
K.Ohsumi:“开发通过同步加速器 X 射线衍射分析亚微米尺寸单晶结构的系统”J.Appl.Cryst.24。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
K. Hagiya: "Modulation in Co-akermanite." Proc. Japan Acad. Ser. B,. 64. 25-29 (1992)
K. Hagiya:“Co-akermanite 的调制。”
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
M.Tanemura: "On the density of the p31m packing ellipses." Zeit.Kristallogr.198. 89-99 (1992)
M.Tanemura:“关于 p31m 堆积椭圆的密度。”
  • DOI:
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  • 影响因子:
    0
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OHMASA Masaaki其他文献

OHMASA Masaaki的其他文献

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{{ truncateString('OHMASA Masaaki', 18)}}的其他基金

Studies on imperfection and phase transformation in crystalline minerals
晶体矿物的缺陷和相变研究
  • 批准号:
    07454135
  • 财政年份:
    1995
  • 资助金额:
    $ 1.09万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Symmetry and hierarchical structure described in the space higher than three dimension
三维以上空间描述的对称性和层次结构
  • 批准号:
    04302061
  • 财政年份:
    1992
  • 资助金额:
    $ 1.09万
  • 项目类别:
    Grant-in-Aid for Co-operative Research (A)

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