The structure described by Pm2O3 is Corundum-like structured and crystallizes in the cubic Ia-3 space group. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to six equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing PmO6 octahedra. The corner-sharing octahedral tilt angles range from 55-57°. In the second Pm site, Pm(2) is bonded to six equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing PmO6 octahedra. The corner-sharing octahedral tilt angles are 57°. O(1) is bonded to one Pm(2) and three equivalent Pm(1) atoms to form a mixture of corner and edge-sharing OPm4 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Pm2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.535
_cell_length_b   9.535
_cell_length_c   9.535
_cell_angle_alpha   109.471
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   667.433
_cell_formula_units_Z   8
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  0.281  0.531  1.0
  Pm  Pm1  1  0.750  0.781  0.031  1.0
  Pm  Pm2  1  0.250  0.219  0.969  1.0
  Pm  Pm3  1  0.031  0.750  0.781  1.0
  Pm  Pm4  1  0.281  0.531  0.750  1.0
  Pm  Pm5  1  0.531  0.750  0.281  1.0
  Pm  Pm6  1  0.000  0.000  0.500  1.0
  Pm  Pm7  1  0.781  0.031  0.750  1.0
  Pm  Pm8  1  0.250  0.719  0.469  1.0
  Pm  Pm9  1  0.719  0.469  0.250  1.0
  Pm  Pm10  1  0.469  0.250  0.719  1.0
  Pm  Pm11  1  0.219  0.969  0.250  1.0
  Pm  Pm12  1  0.500  0.500  0.500  1.0
  Pm  Pm13  1  0.969  0.250  0.219  1.0
  Pm  Pm14  1  0.500  0.000  0.000  1.0
  Pm  Pm15  1  0.000  0.500  0.000  1.0
  O  O16  1  0.271  0.012  0.041  1.0
  O  O17  1  0.959  0.729  0.988  1.0
  O  O18  1  0.971  0.512  0.241  1.0
  O  O19  1  0.512  0.241  0.971  1.0
  O  O20  1  0.741  0.229  0.269  1.0
  O  O21  1  0.769  0.541  0.529  1.0
  O  O22  1  0.988  0.959  0.729  1.0
  O  O23  1  0.529  0.769  0.541  1.0
  O  O24  1  0.041  0.271  0.012  1.0
  O  O25  1  0.488  0.759  0.029  1.0
  O  O26  1  0.731  0.259  0.771  1.0
  O  O27  1  0.729  0.988  0.959  1.0
  O  O28  1  0.459  0.471  0.231  1.0
  O  O29  1  0.029  0.488  0.759  1.0
  O  O30  1  0.771  0.731  0.259  1.0
  O  O31  1  0.541  0.529  0.769  1.0
  O  O32  1  0.269  0.741  0.229  1.0
  O  O33  1  0.229  0.269  0.741  1.0
  O  O34  1  0.759  0.029  0.488  1.0
  O  O35  1  0.241  0.971  0.512  1.0
  O  O36  1  0.471  0.231  0.459  1.0
  O  O37  1  0.231  0.459  0.471  1.0
  O  O38  1  0.259  0.771  0.731  1.0
  O  O39  1  0.012  0.041  0.271  1.0
[/CIF]
.
The structure described by Pm2O3 is Corundum-like structured and crystallizes in the cubic Ia-3 space group. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to six equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing PmO6 octahedra. The corner-sharing octahedral tilt angles range from 55-57°. In the second Pm site, Pm(2) is bonded to six equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing PmO6 octahedra. The corner-sharing octahedral tilt angles are 57°. O(1) is bonded to one Pm(2) and three equivalent Pm(1) atoms to form a mixture of corner and edge-sharing OPm4 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Pm2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.535
_cell_length_b   9.535
_cell_length_c   9.535
_cell_angle_alpha   109.471
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   667.433
_cell_formula_units_Z   8
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  0.281  0.531  1.0
  Pm  Pm1  1  0.750  0.781  0.031  1.0
  Pm  Pm2  1  0.250  0.219  0.969  1.0
  Pm  Pm3  1  0.031  0.750  0.781  1.0
  Pm  Pm4  1  0.281  0.531  0.750  1.0
  Pm  Pm5  1  0.531  0.750  0.281  1.0
  Pm  Pm6  1  0.000  0.000  0.500  1.0
  Pm  Pm7  1  0.781  0.031  0.750  1.0
  Pm  Pm8  1  0.250  0.719  0.469  1.0
  Pm  Pm9  1  0.719  0.469  0.250  1.0
  Pm  Pm10  1  0.469  0.250  0.719  1.0
  Pm  Pm11  1  0.219  0.969  0.250  1.0
  Pm  Pm12  1  0.500  0.500  0.500  1.0
  Pm  Pm13  1  0.969  0.250  0.219  1.0
  Pm  Pm14  1  0.500  0.000  0.000  1.0
  Pm  Pm15  1  0.000  0.500  0.000  1.0
  O  O16  1  0.271  0.012  0.041  1.0
  O  O17  1  0.959  0.729  0.988  1.0
  O  O18  1  0.971  0.512  0.241  1.0
  O  O19  1  0.512  0.241  0.971  1.0
  O  O20  1  0.741  0.229  0.269  1.0
  O  O21  1  0.769  0.541  0.529  1.0
  O  O22  1  0.988  0.959  0.729  1.0
  O  O23  1  0.529  0.769  0.541  1.0
  O  O24  1  0.041  0.271  0.012  1.0
  O  O25  1  0.488  0.759  0.029  1.0
  O  O26  1  0.731  0.259  0.771  1.0
  O  O27  1  0.729  0.988  0.959  1.0
  O  O28  1  0.459  0.471  0.231  1.0
  O  O29  1  0.029  0.488  0.759  1.0
  O  O30  1  0.771  0.731  0.259  1.0
  O  O31  1  0.541  0.529  0.769  1.0
  O  O32  1  0.269  0.741  0.229  1.0
  O  O33  1  0.229  0.269  0.741  1.0
  O  O34  1  0.759  0.029  0.488  1.0
  O  O35  1  0.241  0.971  0.512  1.0
  O  O36  1  0.471  0.231  0.459  1.0
  O  O37  1  0.231  0.459  0.471  1.0
  O  O38  1  0.259  0.771  0.731  1.0
  O  O39  1  0.012  0.041  0.271  1.0
[/CIF]
.