The structure described by SrSm2O4 crystallizes in the orthorhombic Cmcm space group. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Sm(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing SmO6 octahedra. The corner-sharing octahedral tilt angles range from 0-57°. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1) and four equivalent Sm(1) atoms to form distorted OSr2Sm4 octahedra that share corners with two equivalent O(1)Sr2Sm4 octahedra, corners with eight equivalent O(3)Sr2Sm3 trigonal bipyramids, edges with two equivalent O(1)Sr2Sm4 octahedra, edges with four equivalent O(2)Sr2Sm2 tetrahedra, and edges with six equivalent O(3)Sr2Sm3 trigonal bipyramids. The corner-sharing octahedral tilt angles are 49°. In the second O site, O(2) is bonded to two equivalent Sr(1) and two equivalent Sm(1) atoms to form OSr2Sm2 tetrahedra that share corners with two equivalent O(2)Sr2Sm2 tetrahedra, corners with ten equivalent O(3)Sr2Sm3 trigonal bipyramids, edges with four equivalent O(1)Sr2Sm4 octahedra, and edges with two equivalent O(3)Sr2Sm3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Sr(1) and three equivalent Sm(1) atoms to form distorted OSr2Sm3 trigonal bipyramids that share corners with four equivalent O(1)Sr2Sm4 octahedra, corners with five equivalent O(2)Sr2Sm2 tetrahedra, corners with two equivalent O(3)Sr2Sm3 trigonal bipyramids, edges with three equivalent O(1)Sr2Sm4 octahedra,  an edgeedge with one O(2)Sr2Sm2 tetrahedra, and edges with five equivalent O(3)Sr2Sm3 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 10-42°. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrSm2O4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.026
_cell_length_b   6.026
_cell_length_c   11.397
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   146.525
_symmetry_Int_Tables_number   1
_cell_volume   228.243
_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
  Sr  Sr0  1  0.888  0.112  0.250  1.0
  Sr  Sr1  1  0.112  0.888  0.750  1.0
  Sm  Sm2  1  0.633  0.367  0.426  1.0
  Sm  Sm3  1  0.633  0.367  0.074  1.0
  Sm  Sm4  1  0.367  0.633  0.574  1.0
  Sm  Sm5  1  0.367  0.633  0.926  1.0
  O  O6  1  0.000  0.000  0.000  1.0
  O  O7  1  0.000  0.000  0.500  1.0
  O  O8  1  0.538  0.462  0.250  1.0
  O  O9  1  0.736  0.264  0.611  1.0
  O  O10  1  0.736  0.264  0.889  1.0
  O  O11  1  0.462  0.538  0.750  1.0
  O  O12  1  0.264  0.736  0.389  1.0
  O  O13  1  0.264  0.736  0.111  1.0
[/CIF]
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The structure described by SrSm2O4 crystallizes in the orthorhombic Cmcm space group. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Sm(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing SmO6 octahedra. The corner-sharing octahedral tilt angles range from 0-57°. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1) and four equivalent Sm(1) atoms to form distorted OSr2Sm4 octahedra that share corners with two equivalent O(1)Sr2Sm4 octahedra, corners with eight equivalent O(3)Sr2Sm3 trigonal bipyramids, edges with two equivalent O(1)Sr2Sm4 octahedra, edges with four equivalent O(2)Sr2Sm2 tetrahedra, and edges with six equivalent O(3)Sr2Sm3 trigonal bipyramids. The corner-sharing octahedral tilt angles are 49°. In the second O site, O(2) is bonded to two equivalent Sr(1) and two equivalent Sm(1) atoms to form OSr2Sm2 tetrahedra that share corners with two equivalent O(2)Sr2Sm2 tetrahedra, corners with ten equivalent O(3)Sr2Sm3 trigonal bipyramids, edges with four equivalent O(1)Sr2Sm4 octahedra, and edges with two equivalent O(3)Sr2Sm3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Sr(1) and three equivalent Sm(1) atoms to form distorted OSr2Sm3 trigonal bipyramids that share corners with four equivalent O(1)Sr2Sm4 octahedra, corners with five equivalent O(2)Sr2Sm2 tetrahedra, corners with two equivalent O(3)Sr2Sm3 trigonal bipyramids, edges with three equivalent O(1)Sr2Sm4 octahedra,  an edgeedge with one O(2)Sr2Sm2 tetrahedra, and edges with five equivalent O(3)Sr2Sm3 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 10-42°. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrSm2O4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.026
_cell_length_b   6.026
_cell_length_c   11.397
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   146.525
_symmetry_Int_Tables_number   1
_cell_volume   228.243
_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
  Sr  Sr0  1  0.888  0.112  0.250  1.0
  Sr  Sr1  1  0.112  0.888  0.750  1.0
  Sm  Sm2  1  0.633  0.367  0.426  1.0
  Sm  Sm3  1  0.633  0.367  0.074  1.0
  Sm  Sm4  1  0.367  0.633  0.574  1.0
  Sm  Sm5  1  0.367  0.633  0.926  1.0
  O  O6  1  0.000  0.000  0.000  1.0
  O  O7  1  0.000  0.000  0.500  1.0
  O  O8  1  0.538  0.462  0.250  1.0
  O  O9  1  0.736  0.264  0.611  1.0
  O  O10  1  0.736  0.264  0.889  1.0
  O  O11  1  0.462  0.538  0.750  1.0
  O  O12  1  0.264  0.736  0.389  1.0
  O  O13  1  0.264  0.736  0.111  1.0
[/CIF]
.