“…The Al-Fe-Si ternary alloy system has attracted much interest because of its technological importance, and at least 10 stable compounds ( 1 -10 ) together with six metastable ones ( 1 -6 ) have been reported to date [1][2][3][4]. The structures of 3 (Cmma; a = 7.80 Å, b = 15.16 Å, c = 15.22 Å) [5], 4 (I4/mcm; a = 6.07 Å, c = 9.50 Å) [6], 5 (P6 3 /mmc; a = 12.40 Å, c = 26.23 Å) [7], 6 (A2/a; a = 6.16 Å, b = 6.18 Å, c = 20.8 Å, β = 90.4 • ) [8] and 10 (P6 3 /mmc, a = 7.51 Å, c = 7.59 Å) [9] were characterized in detail by the single crystal X-ray diffraction, but the others remain unknown within the best knowledge of the present authors.…”