New quasicrystals are obtained in alloys containing s, p, and d elements (so-called PSD alloys): ${\mathrm{AuLi}}_3$${\mathrm{Al}}_6$, ${\mathrm{Zn}}_{17}$${\mathrm{Li}}_{32}$${\mathrm{Al}}_{51}$, ${\mathrm{Ga}}_{16}$${\mathrm{Mg}}_{32}$${\mathrm{Zn}}_{52}$, and ${\mathrm{Ag}}_{15}$${\mathrm{Mg}}_{35}$${\mathrm{Al}}_{50}$. Transmission electron microscopy and x-ray diffraction studies reveal that these PSD quasicrystals exhibit a unique peak-intensity modulation and packing density suggesting similar atomic decorations of the rhombohedron unit cells of three-dimensional Penrose tiling.

• Received 20 April 1987

DOI:https://doi.org/10.1103/PhysRevB.35.9326