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An aluminium-abundant Al 8 Mn 5 /γ-brass-type intermetallic with formula Al 8.6 Mn 4.4 , which is isotypic with γ-Al 8 Cr 5  and γ-Al 8 V 5 , was discovered by high-temperature sintering of an Al/Mn mixture with initial composition Al 2 Mn. Structure analysis revealed that one special position (Wyckoff site 18 h  in space group  R \overline{3} m ) is shared by Al and Mn, with refined site occupancy factors of 0.7 and 0.3, respectively. The present low-temperature Al 8 Mn 5 -type phase crystallizes in the centrosymmetric space group  R \overline{3} m  (No. 166), rather than  R 3 m  (No. 160) as previously reported for the same intermetallic characterized by TEM measurements [Zeng  et al.  (2018).  Acta Mater.  153 , 364–376].

The structure of the aluminium-abundant γ-brass-type Al8.6Mn4.4

The structure of the aluminium-abundant γ-brass-type Al_8.6Mn_4.4