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We have found a new icosahedral quasicrystal which can coexist with a superlattice or basic decagonal quasicrystals with 0.4 nm periodicity in the Al-Ni-Ru system. This Al-Ni-Ru icosahedral quasicrystal is confirmed to belong to the F-type and its quasiperiodic structure is directly examined by high-resolution electron microscopy. Energy dispersive X-ray spectroscopy analysis and electron diffraction...
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