CRYSTALLINE TYPES OF THE APPROXIMANTS OF 3-DIMENSIONAL QUASICRYSTALS OF VARIOUS SYMMETRIES

摘要

Modules of (5~(12), 6~25~(12), 6~35~(12) and 6~45~(12)) were constructed from unitary block-clusters by the modular design method. These modules form four structural types of crystalline gas hydrate of hierarchical similarity scale. Local areas of symmetry (to 8 nm) in these structures correspond to crystalline appoximants for all four types of quasicrystals (I, D, Dd and O). HREM images taken along principal axes of quasicrystals appeared to be highly efficient to conform the obtained models.