data_ZrNb3Ir
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.87
_cell_length_b   4.87
_cell_length_c   4.87
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   ZrNb3Ir
_chemical_formula_sum   'Zr1 Nb3 Ir1'
_cell_volume   115.72
_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
  Zr  Zr4  1  0.0  0.0  0.0  1.0
  Nb  Nb0  1  0.44  0.0  0.44  1.0
  Nb  Nb1  1  0.44  0.44  0.0  1.0
  Nb  Nb2  1  0.0  0.44  0.44  1.0
  Ir  Ir3  1  0.44  0.44  0.44  1.0

data_ZrNb3Ir
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.89
_cell_length_b   6.89
_cell_length_c   8.44
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   ZrNb3Ir
_chemical_formula_sum   'Zr3 Nb9 Ir3'
_cell_volume   347.15
_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
  Zr  Zr0  3  0.0  0.0  0.0  1.0
  Nb  Nb1  9  0.04  0.52  0.96  1.0
  Ir  Ir2  3  0.0  0.0  0.44  1.0

Zr Nb Nb Nb Ir
Zr Nb Nb Nb Ir 0 2 - - o 0 2 - o o 0 2 o - o 0 2 o o o 0 1 - o - 0 1 - o o 0 1 o o - 0 1 o o o 0 3 o - - 0 3 o - o 0 3 o o - 0 3 o o o 0 4 o o o 1 4 o o o 2 4 o o o 3 4 o o o 
ZrNb3Ir is (Cubic) Perovskite structured and crystallizes in the trigonal R3m space group. Zr(1) is bonded to twelve equivalent Nb(1) atoms to form distorted ZrNb12 cuboctahedra that share corners with twelve equivalent Zr(1)Nb12 cuboctahedra, faces with six equivalent Zr(1)Nb12 cuboctahedra, and faces with eight equivalent Ir(1)Nb6 octahedra. There are a spread of Zr(1)-Nb(1) bond distances ranging from 3.01-3.88 Å. Nb(1) is bonded in a 1-coordinate geometry to four equivalent Zr(1) and two equivalent Ir(1) atoms. There is one shorter (2.13 Å) and one longer (2.75 Å) Nb(1)-Ir(1) bond length. Ir(1) is bonded to six equivalent Nb(1) atoms to form IrNb6 octahedra that share corners with six equivalent Ir(1)Nb6 octahedra and faces with eight equivalent Zr(1)Nb12 cuboctahedra. The corner-sharing octahedra are not tilted.