data_RbIr3Pb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.96
_cell_length_b   4.96
_cell_length_c   4.96
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   RbIr3Pb
_chemical_formula_sum   'Rb1 Ir3 Pb1'
_cell_volume   122.34
_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
  Rb  Rb4  1  0.0  0.0  0.0  1.0
  Ir  Ir1  1  0.0  0.48  0.0  1.0
  Ir  Ir2  1  0.0  0.0  0.48  1.0
  Ir  Ir3  1  0.48  0.0  0.0  1.0
  Pb  Pb0  1  0.48  0.48  0.48  1.0

data_RbIr3Pb
_symmetry_space_group_name_H-M   R3m
_cell_length_a   7.02
_cell_length_b   7.02
_cell_length_c   8.6
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   RbIr3Pb
_chemical_formula_sum   'Rb3 Ir9 Pb3'
_cell_volume   367.02
_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
  Rb  Rb0  3  0.0  0.0  0.0  1.0
  Ir  Ir1  9  0.17  0.35  0.83  1.0
  Pb  Pb2  3  0.0  0.0  0.48  1.0

Rb Ir Ir Ir Pb
RbIr3Pb is (Cubic) Perovskite structured and crystallizes in the trigonal R3m space group. Rb(1) is bonded to six equivalent Ir(1) atoms to form RbIr6 octahedra that share corners with six equivalent Rb(1)Ir6 octahedra and faces with eight equivalent Pb(1)Ir12 cuboctahedra. The corner-sharing octahedra are not tilted. There are three shorter (2.39 Å) and three longer (2.57 Å) Rb(1)-Ir(1) bond lengths. Ir(1) is bonded in a linear geometry to two equivalent Rb(1) and four equivalent Pb(1) atoms. There are a spread of Ir(1)-Pb(1) bond distances ranging from 3.38-3.64 Å. Pb(1) is bonded to twelve equivalent Ir(1) atoms to form distorted PbIr12 cuboctahedra that share corners with twelve equivalent Pb(1)Ir12 cuboctahedra, faces with six equivalent Pb(1)Ir12 cuboctahedra, and faces with eight equivalent Rb(1)Ir6 octahedra.