data_NaCr2Bi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.48
_cell_length_b   4.48
_cell_length_c   4.25
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaCr2Bi
_chemical_formula_sum   'Na1 Cr2 Bi1'
_cell_volume   85.2
_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
  Na  Na3  1  0.0  0.0  0.0  1.0
  Cr  Cr1  1  0.24  0.0  0.12  1.0
  Cr  Cr2  1  0.0  0.24  0.12  1.0
  Bi  Bi0  1  0.24  0.24  0.0  1.0

data_NaCr2Bi
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.33
_cell_length_b   6.33
_cell_length_c   4.25
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   NaCr2Bi
_chemical_formula_sum   'Na2 Cr4 Bi2'
_cell_volume   170.4
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Na  Na0  2  0.0  0.0  0.0  1.0
  Cr  Cr1  4  0.12  0.12  0.12  1.0
  Bi  Bi2  2  0.24  0.0  0.0  1.0

Na Cr Cr Bi
Na Cr Cr Bi 0 2 o o o 0 1 o o o 1 3 o o o 2 3 o o o 
NaCr2Bi is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two NaCr2Bi clusters. Na(1) is bonded in a 2-coordinate geometry to two equivalent Cr(1) atoms. Both Na(1)-Cr(1) bond lengths are 1.19 Å. Cr(1) is bonded in a distorted L-shaped geometry to one Na(1) and one Bi(1) atom. The Cr(1)-Bi(1) bond length is 1.19 Å. Bi(1) is bonded in a 2-coordinate geometry to two equivalent Cr(1) atoms.