Millimeter-Sized Single Icosahedral Quasicrystal of Zn-Mg-Sc Alloy.

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  • Kaneko Yasushi
    Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Kita-ku, Sapporo 060-8628, Japan
  • Ishimasa Tsutomu
    Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Kita-ku, Sapporo 060-8628, Japan

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Description

Millimeter-sized single icosahedral quasicrystals were produced by slow cooling from melt in Zn80.5Mg4.2Sc15.3 alloy. The alloy ingots were melted at 835°C for 1 h and then slowly cooled to an annealing temperature of 750°C at the cooling rates of 28 K/h and 60 K/h. Scanning electron microscopy, electron back-scattered diffraction, and selected-area electron diffraction and powder X-ray diffraction experiments revealed that the single quasicrystal has a P-type (primitive-type) structure with a six-dimensional lattice parameter of 0.7110 nm, and that the structural quality of the quasicrystal is high.

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