The material described by SmO2 is Baddeleyite-like structured and crystallizes in the monoclinic P2_1/m space group. Sm(1) is bonded in a 7-coordinate geometry to three equivalent O(2) and four equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sm(1) atoms to form a mixture of corner and edge-sharing OSm4 tetrahedra. In the second O site, O(2) is bonded in a trigonal planar geometry to three equivalent Sm(1) atoms. is represented by the CIF file [CIF]
data_SmO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.789
_cell_length_b   4.263
_cell_length_c   6.316
_cell_angle_alpha   75.632
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   98.807
_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  0.250  0.820  0.310  1.0
  Sm  Sm1  1  0.750  0.180  0.690  1.0
  O  O2  1  0.250  0.261  0.461  1.0
  O  O3  1  0.750  0.739  0.539  1.0
  O  O4  1  0.750  0.826  0.050  1.0
  O  O5  1  0.250  0.174  0.950  1.0
[/CIF]
.
The material described by SmO2 is Baddeleyite-like structured and crystallizes in the monoclinic P2_1/m space group. Sm(1) is bonded in a 7-coordinate geometry to three equivalent O(2) and four equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sm(1) atoms to form a mixture of corner and edge-sharing OSm4 tetrahedra. In the second O site, O(2) is bonded in a trigonal planar geometry to three equivalent Sm(1) atoms. is represented by the CIF file [CIF]
data_SmO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.789
_cell_length_b   4.263
_cell_length_c   6.316
_cell_angle_alpha   75.632
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   98.807
_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  0.250  0.820  0.310  1.0
  Sm  Sm1  1  0.750  0.180  0.690  1.0
  O  O2  1  0.250  0.261  0.461  1.0
  O  O3  1  0.750  0.739  0.539  1.0
  O  O4  1  0.750  0.826  0.050  1.0
  O  O5  1  0.250  0.174  0.950  1.0
[/CIF]
.