data_Nb4IrRh
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.25
_cell_length_b   5.25
_cell_length_c   5.25
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Nb4IrRh
_chemical_formula_sum   'Nb4 Ir1 Rh1'
_cell_volume   102.42
_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
  Nb  Nb1  1  0.79  0.79  0.64  1.0
  Nb  Nb2  1  0.79  0.64  0.79  1.0
  Nb  Nb3  1  0.64  0.79  0.79  1.0
  Nb  Nb4  1  0.64  0.64  0.64  1.0
  Ir  Ir0  1  0.86  0.86  0.86  1.0
  Rh  Rh5  1  0.0  0.0  0.0  1.0

data_Nb4IrRh
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.25
_cell_length_b   5.25
_cell_length_c   12.86
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Nb4IrRh
_chemical_formula_sum   'Nb12 Ir3 Rh3'
_cell_volume   307.26
_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
  Nb  Nb0  9  0.1  0.05  0.26  1.0
  Nb  Nb1  3  0.0  0.0  0.36  1.0
  Ir  Ir2  3  0.0  0.0  0.14  1.0
  Rh  Rh3  3  0.0  0.0  1.0  1.0

Nb Nb Nb Nb Ir Rh
Nb Nb Nb Nb Ir Rh 0 1 o o o 0 2 o o o 0 3 o o o 0 4 o o o 1 2 o o o 1 3 o o o 1 4 o o o 2 3 o o o 2 4 o o o 4 5 + + + 
Nb4IrRh crystallizes in the trigonal R3m space group. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 5-coordinate geometry to one Nb(2), two equivalent Nb(1), one Ir(1), and one Rh(1) atom. The Nb(1)-Nb(2) bond length is 1.34 Å. Both Nb(1)-Nb(1) bond lengths are 0.77 Å. The Nb(1)-Ir(1) bond length is 1.59 Å. The Nb(1)-Rh(1) bond length is 2.74 Å. In the second Nb site, Nb(2) is bonded in a 9-coordinate geometry to three equivalent Nb(1), three equivalent Ir(1), and three equivalent Rh(1) atoms. All Nb(2)-Ir(1) bond lengths are 3.38 Å. All Nb(2)-Rh(1) bond lengths are 3.05 Å. Ir(1) is bonded in a 4-coordinate geometry to three equivalent Nb(1), three equivalent Nb(2), and one Rh(1) atom. The Ir(1)-Rh(1) bond length is 1.84 Å. Rh(1) is bonded to three equivalent Nb(1), three equivalent Nb(2), and one Ir(1) atom to form distorted corner-sharing RhNb6Ir tetrahedra.