The material structure described by Pm3I is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent I(1) atoms to form a mixture of distorted corner and edge-sharing PmI4 cuboctahedra. In the second Pm site, Pm(2) is bonded in a square co-planar geometry to four equivalent I(1) atoms. I(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form a mixture of face, corner, and edge-sharing IPm12 cuboctahedra. is represented by the CIF file [CIF]
data_Pm3I
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.428
_cell_length_b   6.428
_cell_length_c   6.428
_cell_angle_alpha   135.259
_cell_angle_beta   135.259
_cell_angle_gamma   65.127
_symmetry_Int_Tables_number   1
_cell_volume   129.714
_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
  Pm  Pm0  1  0.750  0.250  0.500  1.0
  Pm  Pm1  1  0.250  0.750  0.500  1.0
  Pm  Pm2  1  0.500  0.500  0.000  1.0
  I  I3  1  0.000  0.000  0.000  1.0
[/CIF]
.
The material structure described by Pm3I is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent I(1) atoms to form a mixture of distorted corner and edge-sharing PmI4 cuboctahedra. In the second Pm site, Pm(2) is bonded in a square co-planar geometry to four equivalent I(1) atoms. I(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form a mixture of face, corner, and edge-sharing IPm12 cuboctahedra. is represented by the CIF file [CIF]
data_Pm3I
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.428
_cell_length_b   6.428
_cell_length_c   6.428
_cell_angle_alpha   135.259
_cell_angle_beta   135.259
_cell_angle_gamma   65.127
_symmetry_Int_Tables_number   1
_cell_volume   129.714
_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
  Pm  Pm0  1  0.750  0.250  0.500  1.0
  Pm  Pm1  1  0.250  0.750  0.500  1.0
  Pm  Pm2  1  0.500  0.500  0.000  1.0
  I  I3  1  0.000  0.000  0.000  1.0
[/CIF]
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