The structure described by SmAsO2 crystallizes in the tetragonal I4_1/a space group. Sm(1) is bonded to six equivalent O(1) atoms to form edge-sharing SmO6 octahedra. As(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. O(1) is bonded to three equivalent Sm(1) and two equivalent As(1) atoms to form a mixture of distorted edge and corner-sharing OSm3As2 trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_SmAsO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.549
_cell_length_b   6.549
_cell_length_c   7.488
_cell_angle_alpha   115.933
_cell_angle_beta   115.933
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   252.410
_cell_formula_units_Z   4
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  0.625  0.875  0.250  1.0
  Sm  Sm1  1  0.625  0.375  0.250  1.0
  Sm  Sm2  1  0.625  0.375  0.750  1.0
  Sm  Sm3  1  0.125  0.375  0.750  1.0
  As  As4  1  0.125  0.375  0.250  1.0
  As  As5  1  0.125  0.875  0.250  1.0
  As  As6  1  0.125  0.875  0.750  1.0
  As  As7  1  0.625  0.875  0.750  1.0
  O  O8  1  0.418  0.172  0.341  1.0
  O  O9  1  0.923  0.169  0.341  1.0
  O  O10  1  0.419  0.168  0.841  1.0
  O  O11  1  0.832  0.578  0.159  1.0
  O  O12  1  0.422  0.673  0.841  1.0
  O  O13  1  0.327  0.581  0.159  1.0
  O  O14  1  0.831  0.582  0.659  1.0
  O  O15  1  0.828  0.077  0.659  1.0
[/CIF]
.
The structure described by SmAsO2 crystallizes in the tetragonal I4_1/a space group. Sm(1) is bonded to six equivalent O(1) atoms to form edge-sharing SmO6 octahedra. As(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. O(1) is bonded to three equivalent Sm(1) and two equivalent As(1) atoms to form a mixture of distorted edge and corner-sharing OSm3As2 trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_SmAsO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.549
_cell_length_b   6.549
_cell_length_c   7.488
_cell_angle_alpha   115.933
_cell_angle_beta   115.933
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   252.410
_cell_formula_units_Z   4
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  0.625  0.875  0.250  1.0
  Sm  Sm1  1  0.625  0.375  0.250  1.0
  Sm  Sm2  1  0.625  0.375  0.750  1.0
  Sm  Sm3  1  0.125  0.375  0.750  1.0
  As  As4  1  0.125  0.375  0.250  1.0
  As  As5  1  0.125  0.875  0.250  1.0
  As  As6  1  0.125  0.875  0.750  1.0
  As  As7  1  0.625  0.875  0.750  1.0
  O  O8  1  0.418  0.172  0.341  1.0
  O  O9  1  0.923  0.169  0.341  1.0
  O  O10  1  0.419  0.168  0.841  1.0
  O  O11  1  0.832  0.578  0.159  1.0
  O  O12  1  0.422  0.673  0.841  1.0
  O  O13  1  0.327  0.581  0.159  1.0
  O  O14  1  0.831  0.582  0.659  1.0
  O  O15  1  0.828  0.077  0.659  1.0
[/CIF]
.