Study on mesoscopic physical phenomenon in many particle systems by electron holography

电子全息研究多粒子系统介观物理现象

• 批准号: 11440101
• 负责人: HIRAGA Kenji
• 金额: $ 9.98万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440101/
• 关键词: Crystalline approximant; Cubic structure; Quasicrystals; Icosahedral quasicrystals; X-ray diffraction; Single crystal X-ray diffractometry; Crystal structure; 立方晶近似結晶; 立方晶相; 正20面体原子クラスター

1) We determined site occupancy of Zn atoms in (Al, Zn)_<49>Mg_<32>-type Mg_<40>Al_<60-x>Zn_x (x=14=51) alloys by single crystal X-ray diffractometry. We also demonstrated that they have no atom at the center of Bergman-type atom cluster, on the contrary to the previously proposed models.2) We succeeded in fabricating a single crystal of 2/1 cubic approximant, which were found in (Al, Zn)-Mg alloys, and determined sophisticated structure of Bergman clusters by X-ray diffractometry.3)Single crystal diffractometry allowed us to determine the structure of the following 1/0 crystalline approximants : Al_<66.8>Pd_<21.2>Ru_<12.0> (Fms ; a=1.56058nm), Al_<63.6>Pd_<30.2>Fe_<6.2> (Fms ; a=1.55187nm), and Al_<68.9>Pd_<17.1>Fe_<13.9> (Fms ; a=1.53755nm). Surrounding the 1/4, 1/4, 1/4 position, Al assumes icosahedral coordination, which were also surrounded by pentagonally-coordinated clusters that share edges and forms a simple cubic arrangement.4) We showed, using single crystal X-ray diffractometry, that Al_<57.3>Cu_<31.4>Ru_<11.3> 1/1 crystalline approximant belongs to the cubic system with Pm3 and a=1.23773, in which truncated dodecahedron clusters arrange themselves in a cubic manner, sharing octahedrons.5)We also showed that 1/0, 1/1, 2/1 crystalline approximants are grouped into the simple cubic and body-centered cubic systems when viewed via arrangements of icosahedral atom clusters.

1)本文用单晶X射线衍射法测定了（Al，Zn）_<49>Mg_<32>型Mg_<40>Al_<60-x>Zn_x（x=14=51）合金中Zn原子的占位。2）我们成功地制备出了（Al，Zn）-Mg合金中的2/1立方近似晶体，并对该晶体的结构进行了分析，发现在（Al，Zn）-Mg合金中存在2/1立方近似晶体。用X射线衍射法测定了Bergman团簇的复杂结构。3）单晶衍射法使我们能够测定下列1/0结晶近似物：Al_<66.8>Pd_<21.2>Ru_<12.0>（Fms ; a=1.56058nm）、Al_<63.6>Pd_<30.2>Fe_<6.2>（Fms ; a=1.55187nm）和Al_<68.9>Pd_<17.1>Fe_<13.9>（Fms ; a=1.53755nm）。Al_Cu_Ru_（1/1）晶体近似物属于立方晶系，Pm_3，a=1.23773，Al_Cu_Ru_（1/1）晶体近似物的晶胞参数为：Al_ Cu_Ru_（1/1）晶体近似物的晶胞参数为：Al_ Cu_Ru_（1/1）晶体近似物的晶胞参数为：Al_<57.3>Cu_<31.4>Ru_（1/1）晶体近似物的晶胞参数为<11.3>：其中截顶十二面体原子团簇以立方体的方式排列，共享八面体。5）我们还表明，从二十面体原子团簇的排列来看，1/0，1/1，2/1晶体近似物可以分为简单立方和体心立方系统。

项目成果

杉山和正,平賀賢二: "正20面体準結晶の近似結晶"まてりあ. 39・8. 635-640 (2000)

Kazumasa Sugiyama、Kenji Hiraga：“二十面体准晶体的近似晶体”Materia 39・8（2000）。

K.Saito,K.Sugiyama and K.Hiraga: "New 1/1 Cubic Approximant Phases in the Al-Cu-Ru-Si system studied by Electron Diffraction and High-Resolution Electron Microscopy"Philosophical Magazine Letters. 80・2. 73-78 (2000)

K.Saito、K.Sugiyama 和 K.Hiraga：“通过电子衍射和高分辨率电子显微镜研究 Al-Cu-Ru-Si 系统中的新 1/1 立方近似相”哲学杂志快报 80・2。 -78 (2000)

K.Saito,K.Sugiyama and K.Hiraga: "New l/l Cubic Approximant Phases in the Al-Cu-Ru-Si System Studied by Electron Diffraction and High-Resolution Electron Microscopy"Philos.Mag.Lett.. 80・2. 73-78 (2000)

K.Saito、K.Sugiyama 和 K.Hiraga：“通过电子衍射和高分辨率电子显微镜研究的 Al-Cu-Ru-Si 系统中的新 l/l 立方近似相”Philos.Mag.Lett.. 80・2. 73-78 (2000)

K.Sugiyama,T.Kato,T.Ogawa,K.Hiraga,and K.Saito: "Crystal.Structure of a New l/l-Rational Approximant for the Al-Cu-Ru Icosahedral Phase"Journal or Alloys and Compounds. 299. 169-174 (2000)

K.Sugiyama、T.Kato、T.Okawa、K.Hiraga 和 K.Saito：“Crystal.Structure of a New l/l-Rational Approximant for the Al-Cu-Ru二十面体相”期刊或合金和化合物。

K.Sugiyama, T.Kato, T.Ogawa, K.Hiraga, and K.Saito: "Crystal Structure of a New 1/1-Rational Approximant for the Al-Cu-Ru Icosahedral Phase"Journal of Alloys and Compounds. 299. 169-174 (2000)

K.Sugiyama、T.Kato、T.Okawa、K.Hiraga 和 K.Saito：“Al-Cu-Ru 二十面体相的新 1/1 有理近似的晶体结构”合金与化合物杂志。