The material structure described by Pm3Cr 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 Pm(1), four equivalent Pm(2), and four equivalent Cr(1) atoms to form distorted PmPm8Cr4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Cr4 cuboctahedra, edges with eight equivalent Pm(1)Pm8Cr4 cuboctahedra, edges with eight equivalent Cr(1)Pm12 cuboctahedra, faces with four equivalent Cr(1)Pm12 cuboctahedra, and faces with ten equivalent Pm(1)Pm8Cr4 cuboctahedra. In the second Pm site, Pm(2) is bonded in a distorted square co-planar geometry to eight equivalent Pm(1) and four equivalent Cr(1) atoms. Cr(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form CrPm12 cuboctahedra that share corners with four equivalent Cr(1)Pm12 cuboctahedra, edges with eight equivalent Cr(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Cr4 cuboctahedra, faces with four equivalent Cr(1)Pm12 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Cr4 cuboctahedra. is represented by the CIF card [CIF]
data_Pm3Cr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.065
_cell_length_b   6.065
_cell_length_c   6.065
_cell_angle_alpha   133.158
_cell_angle_beta   133.158
_cell_angle_gamma   68.406
_symmetry_Int_Tables_number   1
_cell_volume   116.631
_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
  Cr  Cr3  1  0.000  0.000  0.000  1.0
[/CIF]
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The material structure described by Pm3Cr 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 Pm(1), four equivalent Pm(2), and four equivalent Cr(1) atoms to form distorted PmPm8Cr4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Cr4 cuboctahedra, edges with eight equivalent Pm(1)Pm8Cr4 cuboctahedra, edges with eight equivalent Cr(1)Pm12 cuboctahedra, faces with four equivalent Cr(1)Pm12 cuboctahedra, and faces with ten equivalent Pm(1)Pm8Cr4 cuboctahedra. In the second Pm site, Pm(2) is bonded in a distorted square co-planar geometry to eight equivalent Pm(1) and four equivalent Cr(1) atoms. Cr(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form CrPm12 cuboctahedra that share corners with four equivalent Cr(1)Pm12 cuboctahedra, edges with eight equivalent Cr(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Cr4 cuboctahedra, faces with four equivalent Cr(1)Pm12 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Cr4 cuboctahedra. is represented by the CIF card [CIF]
data_Pm3Cr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.065
_cell_length_b   6.065
_cell_length_c   6.065
_cell_angle_alpha   133.158
_cell_angle_beta   133.158
_cell_angle_gamma   68.406
_symmetry_Int_Tables_number   1
_cell_volume   116.631
_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
  Cr  Cr3  1  0.000  0.000  0.000  1.0
[/CIF]
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