data_MgNi4Ir
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.72
_cell_length_b   4.72
_cell_length_c   4.72
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgNi4Ir
_chemical_formula_sum   'Mg1 Ni4 Ir1'
_cell_volume   74.49
_cell_formula_units_Z   1
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
  Mg  Mg1  1  0.0  0.0  0.0  1.0
  Ni  Ni2  1  0.17  0.17  0.51  1.0
  Ni  Ni3  1  0.17  0.51  0.17  1.0
  Ni  Ni4  1  0.51  0.17  0.17  1.0
  Ni  Ni5  1  0.51  0.51  0.51  1.0
  Ir  Ir0  1  0.01  0.01  0.01  1.0

data_MgNi4Ir
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.72
_cell_length_b   4.72
_cell_length_c   11.57
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   MgNi4Ir
_chemical_formula_sum   'Mg3 Ni12 Ir3'
_cell_volume   223.48
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  Mg  Mg0  3  0.0  0.0  0.0  1.0
  Ni  Ni1  9  0.1  0.55  0.38  1.0
  Ni  Ni2  3  0.0  0.0  0.49  1.0
  Ir  Ir3  3  0.0  0.0  0.99  1.0

Mg Ni Ni Ni Ni Ir
MgIrNi4 crystallizes in the trigonal R3m space group. Mg(1) is bonded in a single-bond geometry to one Ir(1) and three equivalent Ni(1) atoms. The Mg(1)-Ir(1) bond length is 0.11 Å. All Mg(1)-Ni(1) bond lengths are 1.89 Å. Ir(1) is bonded in a single-bond geometry to one Mg(1) atom. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 3-coordinate geometry to one Mg(1), two equivalent Ni(1), and three equivalent Ni(2) atoms. Both Ni(1)-Ni(1) bond lengths are 1.62 Å. There are two shorter (2.69 Å) and one longer (2.81 Å) Ni(1)-Ni(2) bond length. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to nine equivalent Ni(1) atoms.