The compound described by HoNiAl4 crystallizes in the orthorhombic Cmcm space group. Ho(1) is bonded in a 15-coordinate geometry to two equivalent Ni(1), three equivalent Al(2), four equivalent Al(1), and six equivalent Al(3) atoms. Ni(1) is bonded in a 7-coordinate geometry to two equivalent Ho(1), one Al(2), and six equivalent Al(3) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted q6 geometry to four equivalent Ho(1), two equivalent Al(3), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a distorted single-bond geometry to three equivalent Ho(1), one Ni(1), and four equivalent Al(1) atoms. In the third Al site, Al(3) is bonded in a 3-coordinate geometry to three equivalent Ho(1), three equivalent Ni(1), and one Al(1) atom. is represented by the CIF file [CIF]
data_HoAl4Ni
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.038
_cell_length_b   6.549
_cell_length_c   7.900
_cell_angle_alpha   90.000
_cell_angle_beta   104.806
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   201.952
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Ho  Ho0  1  0.118  0.750  0.236  1.0
  Ho  Ho1  1  0.882  0.250  0.764  1.0
  Al  Al2  1  0.500  0.000  0.000  1.0
  Al  Al3  1  0.500  0.500  0.000  1.0
  Al  Al4  1  0.076  0.250  0.153  1.0
  Al  Al5  1  0.924  0.750  0.847  1.0
  Al  Al6  1  0.689  0.053  0.378  1.0
  Al  Al7  1  0.311  0.947  0.622  1.0
  Al  Al8  1  0.311  0.553  0.622  1.0
  Al  Al9  1  0.689  0.447  0.378  1.0
  Ni  Ni10  1  0.774  0.750  0.547  1.0
  Ni  Ni11  1  0.226  0.250  0.453  1.0
[/CIF]
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The compound described by HoNiAl4 crystallizes in the orthorhombic Cmcm space group. Ho(1) is bonded in a 15-coordinate geometry to two equivalent Ni(1), three equivalent Al(2), four equivalent Al(1), and six equivalent Al(3) atoms. Ni(1) is bonded in a 7-coordinate geometry to two equivalent Ho(1), one Al(2), and six equivalent Al(3) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted q6 geometry to four equivalent Ho(1), two equivalent Al(3), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a distorted single-bond geometry to three equivalent Ho(1), one Ni(1), and four equivalent Al(1) atoms. In the third Al site, Al(3) is bonded in a 3-coordinate geometry to three equivalent Ho(1), three equivalent Ni(1), and one Al(1) atom. is represented by the CIF file [CIF]
data_HoAl4Ni
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.038
_cell_length_b   6.549
_cell_length_c   7.900
_cell_angle_alpha   90.000
_cell_angle_beta   104.806
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   201.952
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Ho  Ho0  1  0.118  0.750  0.236  1.0
  Ho  Ho1  1  0.882  0.250  0.764  1.0
  Al  Al2  1  0.500  0.000  0.000  1.0
  Al  Al3  1  0.500  0.500  0.000  1.0
  Al  Al4  1  0.076  0.250  0.153  1.0
  Al  Al5  1  0.924  0.750  0.847  1.0
  Al  Al6  1  0.689  0.053  0.378  1.0
  Al  Al7  1  0.311  0.947  0.622  1.0
  Al  Al8  1  0.311  0.553  0.622  1.0
  Al  Al9  1  0.689  0.447  0.378  1.0
  Ni  Ni10  1  0.774  0.750  0.547  1.0
  Ni  Ni11  1  0.226  0.250  0.453  1.0
[/CIF]
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