The crystal stucture of a gamma-(Al-Cu-Ru-Si) cubic phase: A new approximant phase for the Al-Cu-Ru icosahedral quasicrystal
The crystal stucture of a gamma-(Al-Cu-Ru-Si) cubic phase: A new approximant phase for the Al-Cu-Ru icosahedral quasicrystal
复制标题
γ-(Al-Cu-Ru-Si)立方相的晶体结构：Al-Cu-Ru二十面体准晶的新近似相
DOI：
10.1080/095008398178615
复制
发表时间：
1998
影响因子：
1.2
通讯作者：
K. Hiraga
中科院分区：
文献类型：
--
作者：
K. Sugiyama;T. Kato;Kaichi Saito;K. Hiraga
用X射线单晶衍射法测定了γ-（Al-Cu-Ru-Si）立方相（Al-Cu-Ru-Si）的晶体结构，它被认为与Al-Cu_（55.1）14.6 20.2 10.1 Ru二十面体准晶的结构密切相关。的原子模型，细化到最终的R值为0.0346，有大约262个原子的原子比铝铜钌在一个立方晶胞与晶格常数为66.3 13.5 19.8 a = 1.538 0（2）nm和空间群Fm 3。的基本结构的特征在于由一个SC安排的十二面体原子簇的间距为0.77 nm，这对应于一个1/0立方近似相的二十面体准晶的晶格常数。在十二面体簇中的成分的化学排序产生具有1/0立方近似相的晶格常数的两倍的超结构。
The crystal structure of a gamma-(Al-Cu-Ru-Si) cubic phase (Al Cu Ru Si ), considered to be closely related to that of the Al-Cu55.1 14.6 20.2 10.1 Ru icosahedral quasicrystal, has been determined by single-crystal X-ray diffraction. The atomic model, refined to a final R value of 0.0346, has about 262 atoms with an atomic ratio of Al Cu Ru in a cubic unit cell with a 66.3 13.5 19.8 lattice constant a = 1.538 0(2) nm and the space group Fm 3. The fundamental structure is characterized by a sc arrangement of dodecahedral atom clusters with an interval of 0.77 nm, which corresponds to a lattice constant of a 1/0 cubic approximant phase for the icosahedral quasicrystals. The chemical ordering of the constituents in the dodecahedral cluster produces a superstructure with a lattice constant twice that of a 1/0 cubic approximant phase.