Ni2Al3Ho crystallizes in the hexagonal P6/mmm space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 18-coordinate geometry to six equivalent Ni(1), six equivalent Al(1), and six equivalent Al(2) atoms. In the second Ho site, Ho(2) is bonded in a hexagonal planar geometry to six equivalent Ni(1) atoms. Ni(1) is bonded in a 9-coordinate geometry to one Ho(2), two equivalent Ho(1), two equivalent Al(1), and four equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 4-coordinate geometry to four equivalent Ho(1) and four equivalent Ni(1) atoms. In the second Al site, Al(2) is bonded in a 4-coordinate geometry to two equivalent Ho(1) and four equivalent Ni(1) atoms.
Ni2Al3Ho crystallizes in the hexagonal P6/mmm space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 18-coordinate geometry to six equivalent Ni(1), six equivalent Al(1), and six equivalent Al(2) atoms. All Ho(1)-Ni(1) bond lengths are 3.10 Å. All Ho(1)-Al(1) bond lengths are 3.27 Å. All Ho(1)-Al(2) bond lengths are 3.15 Å. In the second Ho site, Ho(2) is bonded in a hexagonal planar geometry to six equivalent Ni(1) atoms. All Ho(2)-Ni(1) bond lengths are 2.80 Å. Ni(1) is bonded in a 9-coordinate geometry to one Ho(2), two equivalent Ho(1), two equivalent Al(1), and four equivalent Al(2) atoms. Both Ni(1)-Al(1) bond lengths are 2.48 Å. All Ni(1)-Al(2) bond lengths are 2.47 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 4-coordinate geometry to four equivalent Ho(1) and four equivalent Ni(1) atoms. In the second Al site, Al(2) is bonded in a 4-coordinate geometry to two equivalent Ho(1) and four equivalent Ni(1) atoms.