A new orthorhombic approximant of the Ga–Mn and Ga–Fe–Cu–Si decagonal quasicrystals consisting entirely of uniformly oriented ‘crown’ subunits

On the concept of metadislocations in complex metallic alloys

“…Structures of this type have indeed been observed in Al-Cr-Fe [19] and Ga 7 Mn 5 [20] and do most probably exist in the system Al-Mn-Pd [21]. Other structures with different c-lattice 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 …”

Electron microscopy study of approximant phases in the Al–Cr–Fe system

“…with an increment of τ+0) (figure 3b). This phase was observed in the Ga-Mn system [17]. A tiling constituted by a succession of rows of elongated hexagons and rows of crowns corresponds to the O A structure (single row of hexagon, increment of τ+2) (figure 3c) and to the O B structure (two rows of hexagons, increment of τ+4) (figure 3d It is particularly important to underline here that the same approach using an approximant possessing a periodicity along the pseudo-tenfold axis equal to 16.6 Å allows us to describe the compounds with increment of τ+3 and τ+5.…”