Evolution of superlattice order in Al-Mn quasicrystals and its relation to face-centred icosahedral quasicrystals

We have established a simple icosahedral to face-centred icosahedral ordering transformation in Al-Mn quasicrystals. This result strongly supports the view that the recently discovered face-centred icosahedral quasicrystal in ternary Al-Cu-Fe and related alloys represents a long-range superstructure of simple icosahedral quasicrystals