The Z-Zn6Mg3Sm ternary phase has been studied by electron diffraction. Y and the rare-earth elements with atomic radii just below that of Sm in Zn6Mg3RE alloys (RE = rare earth or Y) form the icosahedral phase, while with Sm it forms the Z phase. The Z phase is hexagonal with a = 12.4 Å and c = 8.8 Å, and with the space group P63/mmc. The relationship of this phase to the icosahedral quasicrystal is demonstrated through diffraction features. It is shown that this hexagonal phase consists of three icosahedral units rotated by 120° about a common twofold axis, forming the sixfold axis. The similarity of this hexagonal phase to the hexagonal quasicrystal is shown.
ASJC Scopus subject areas
- Condensed Matter Physics