The corresponding structure is plotted in Fig. 1. It is composed of one atomic position for Hf/Ta (4f Wyckoff site) and two inequivalent positions for the Fe atoms: the 2a and 6h Wyckoff position. The unit cell is composed of 4 formula units and this SAG crystal structure is typical of Frank and Kasper type intermetallic phases featured by icosahedral polyhedron with low coordination of 12 . The 2a Fe atoms located at (0, 0, 0) position have an axial symmetry (−3m).