収束電子回折法によって明らかにしたCd系正20面体準結晶の特異な対称性 Unique Symmetry of Cd-Based Icosahedral Quasicrystals Studied by Convergent-Beam Electron Diffraction
Symmetry of icosahedral quasicrystals of Cd-Mg-Yb and Cd-Yb has been investigated by the convergent-beam electron diffraction (CBED) method.<BR>The CBED pattern symmetries of the Cd-based quasicrystals are not consistent with any icosahedral point groups, indicating that the structures of the alloys have no icosahedral symmetry. Selected-area electron diffraction patterns of the alloys show regular icosahedral symmetry, indicating that the alloys has a regular icosahedral lattice with a long-range quasiperiodic order. We consider that the structure of the Cd-based quasicrystals is formed by a quasiperiodic arrangement of a non-icosahedral atom-cluster with the same orientation.
日本結晶学会誌 49(1), 34-39, 2007-02-27
The Crystallographic Society of Japan