The structure described by Sm2Bi crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to five equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing SmBi5 square pyramids. In the second Sm site, Sm(2) is bonded in a 8-coordinate geometry to four equivalent Sm(2) and four equivalent Bi(1) atoms. Bi(1) is bonded in a 9-coordinate geometry to four equivalent Sm(2) and five equivalent Sm(1) atoms. is represented by the CIF file [CIF]
data_Sm2Bi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.573
_cell_length_b   4.573
_cell_length_c   9.487
_cell_angle_alpha   103.947
_cell_angle_beta   103.947
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   186.541
_cell_formula_units_Z   2
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
  Sm  Sm0  1  0.321  0.321  0.642  1.0
  Sm  Sm1  1  0.679  0.679  0.358  1.0
  Sm  Sm2  1  0.000  0.500  0.000  1.0
  Sm  Sm3  1  0.500  0.000  0.000  1.0
  Bi  Bi4  1  0.139  0.139  0.278  1.0
  Bi  Bi5  1  0.861  0.861  0.722  1.0
[/CIF]
.
The structure described by Sm2Bi crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to five equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing SmBi5 square pyramids. In the second Sm site, Sm(2) is bonded in a 8-coordinate geometry to four equivalent Sm(2) and four equivalent Bi(1) atoms. Bi(1) is bonded in a 9-coordinate geometry to four equivalent Sm(2) and five equivalent Sm(1) atoms. is represented by the CIF file [CIF]
data_Sm2Bi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.573
_cell_length_b   4.573
_cell_length_c   9.487
_cell_angle_alpha   103.947
_cell_angle_beta   103.947
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   186.541
_cell_formula_units_Z   2
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
  Sm  Sm0  1  0.321  0.321  0.642  1.0
  Sm  Sm1  1  0.679  0.679  0.358  1.0
  Sm  Sm2  1  0.000  0.500  0.000  1.0
  Sm  Sm3  1  0.500  0.000  0.000  1.0
  Bi  Bi4  1  0.139  0.139  0.278  1.0
  Bi  Bi5  1  0.861  0.861  0.722  1.0
[/CIF]
.