The structure of a Cd68Mg12Dy20 crystalline phase denoted as the φ-phase, which has a composition close to that of the Cd66Mg21Dy13 icosahedral quasicrystalline phase, has been investigated by electron diffraction and scanning transmission electron microscopy (STEM). The φ phase has a fcc lattice with a = 21.6 Å. High-angle annular dark-field STEM with Z contrast confirms that the phase has the Cd45Sm11-type structure. The atomic cluster in the structure is shown to be characterized by a Friauf polyhedron with tetrahedral symmetry.
ASJC Scopus subject areas
- Condensed Matter Physics