The structure of the aluminium-abundant γ-brass-type Al 8.6 Mn 4.4 .

An aluminium-abundant Al 8 Mn 5 /γ-brass-type inter-metallic 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 sinter-ing 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 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 m (No. 166), rather than R 3 m (No. 160) as previously reported for the same inter-metallic characterized by TEM measurements [Zeng et al. (2018 ▸). Acta Mater. 153 , 364-376].