A New Series of Icosahedral Quasicrystals in Zn-M-Sc (M = Ag, Au, Pd, Pt) Alloys

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A new series of icosahedral quasicrystals has been found in Zn75M10Sc15 (M = Ag, Au, Pd and Pt) as-cast alloys. Electron and powder X-ray diffraction analyses indicated that these quasicrystals are of the P-type (primitive type) and have six-dimensional lattice parameters $a_{\text{6D}}=0.7112--0.7151$ nm. The quasicrystals are formed as main phases in these alloys. In the Zn80Ag5Sc15 alloy annealed at 981 K for 24 h, a Zn85Sc15-type cubic phase is formed exclusively, which has the lattice parameter $a=1.3867$ nm. The cubic phase is interpreted as a 1/1 approximant of Zn75Ag10Sc15. This observation, as well as intensity similarity in the X-ray diffraction patterns, suggests that Zn75M10Sc15 quasicrystals belong to the same group as the Zn80Mg5Sc15 quasicrystal from the viewpoint of a local atomic configuration.
2003-10-15