The crystal structure described by Sm2Mo2O7 crystallizes in the cubic Fd-3m space group. Sm(1) is bonded in a distorted hexagonal planar geometry to six equivalent O(1) atoms. Mo(1) is bonded in a body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Mo(1) atoms to form OSm2Mo2 tetrahedra that share corners with two equivalent O(2)Mo4 tetrahedra, corners with twelve equivalent O(1)Sm2Mo2 tetrahedra,  an edgeedge with one O(2)Mo4 tetrahedra, and edges with four equivalent O(1)Sm2Mo2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Mo(1) atoms to form OMo4 tetrahedra that share corners with four equivalent O(2)Mo4 tetrahedra, corners with twelve equivalent O(1)Sm2Mo2 tetrahedra, and edges with six equivalent O(1)Sm2Mo2 tetrahedra. is represented by the CIF file [CIF]
data_Sm2Mo2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.416
_cell_length_b   7.416
_cell_length_c   7.416
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   288.429
_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  0.625  0.125  0.125  1.0
  Sm  Sm1  1  0.125  0.625  0.125  1.0
  Sm  Sm2  1  0.125  0.125  0.625  1.0
  Sm  Sm3  1  0.125  0.125  0.125  1.0
  Mo  Mo4  1  0.125  0.625  0.625  1.0
  Mo  Mo5  1  0.625  0.125  0.625  1.0
  Mo  Mo6  1  0.625  0.625  0.125  1.0
  Mo  Mo7  1  0.625  0.625  0.625  1.0
  O  O8  1  0.741  0.741  0.259  1.0
  O  O9  1  0.259  0.259  0.741  1.0
  O  O10  1  0.741  0.259  0.741  1.0
  O  O11  1  0.259  0.741  0.259  1.0
  O  O12  1  0.259  0.741  0.741  1.0
  O  O13  1  0.741  0.259  0.259  1.0
  O  O14  1  0.509  0.509  0.991  1.0
  O  O15  1  0.991  0.991  0.509  1.0
  O  O16  1  0.509  0.991  0.509  1.0
  O  O17  1  0.991  0.509  0.991  1.0
  O  O18  1  0.991  0.509  0.509  1.0
  O  O19  1  0.509  0.991  0.991  1.0
  O  O20  1  0.500  0.500  0.500  1.0
  O  O21  1  0.750  0.750  0.750  1.0
[/CIF]
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The crystal structure described by Sm2Mo2O7 crystallizes in the cubic Fd-3m space group. Sm(1) is bonded in a distorted hexagonal planar geometry to six equivalent O(1) atoms. Mo(1) is bonded in a body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Mo(1) atoms to form OSm2Mo2 tetrahedra that share corners with two equivalent O(2)Mo4 tetrahedra, corners with twelve equivalent O(1)Sm2Mo2 tetrahedra,  an edgeedge with one O(2)Mo4 tetrahedra, and edges with four equivalent O(1)Sm2Mo2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Mo(1) atoms to form OMo4 tetrahedra that share corners with four equivalent O(2)Mo4 tetrahedra, corners with twelve equivalent O(1)Sm2Mo2 tetrahedra, and edges with six equivalent O(1)Sm2Mo2 tetrahedra. is represented by the CIF file [CIF]
data_Sm2Mo2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.416
_cell_length_b   7.416
_cell_length_c   7.416
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   288.429
_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  0.625  0.125  0.125  1.0
  Sm  Sm1  1  0.125  0.625  0.125  1.0
  Sm  Sm2  1  0.125  0.125  0.625  1.0
  Sm  Sm3  1  0.125  0.125  0.125  1.0
  Mo  Mo4  1  0.125  0.625  0.625  1.0
  Mo  Mo5  1  0.625  0.125  0.625  1.0
  Mo  Mo6  1  0.625  0.625  0.125  1.0
  Mo  Mo7  1  0.625  0.625  0.625  1.0
  O  O8  1  0.741  0.741  0.259  1.0
  O  O9  1  0.259  0.259  0.741  1.0
  O  O10  1  0.741  0.259  0.741  1.0
  O  O11  1  0.259  0.741  0.259  1.0
  O  O12  1  0.259  0.741  0.741  1.0
  O  O13  1  0.741  0.259  0.259  1.0
  O  O14  1  0.509  0.509  0.991  1.0
  O  O15  1  0.991  0.991  0.509  1.0
  O  O16  1  0.509  0.991  0.509  1.0
  O  O17  1  0.991  0.509  0.991  1.0
  O  O18  1  0.991  0.509  0.509  1.0
  O  O19  1  0.509  0.991  0.991  1.0
  O  O20  1  0.500  0.500  0.500  1.0
  O  O21  1  0.750  0.750  0.750  1.0
[/CIF]
.