Figure 1.

Crystal structures of (a) LaNi₅ with a = 5.013 Å and c = 3.987 Å in the space group P6/mmm (No. 191) [21], and (b) LaNi₅H₆ with a = 5.410 Å and c = 4.293 Å in the space group P31m (No. 157) [18]. Gray, green, and blue spheres indicate La, Ni, and H atoms, respectively. The brown octahedron and gray tetrahedron denote H atomic sites at 3c and 6d, respectively.