The material described by Sm2Mn2O7 crystallizes in the cubic Fd-3m space group. Sm(1) is bonded to two equivalent O(2) and six equivalent O(1) atoms to form distorted SmO8 hexagonal bipyramids that share edges with six equivalent Sm(1)O8 hexagonal bipyramids and edges with six equivalent Mn(1)O6 octahedra. Mn(1) is bonded to six equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra and edges with six equivalent Sm(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 46°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sm(1) and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded to four equivalent Sm(1) atoms to form corner-sharing OSm4 tetrahedra. is represented by the CIF file [CIF]
data_Sm2Mn2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.110
_cell_length_b   7.110
_cell_length_c   7.110
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   254.204
_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  0.125  0.625  0.125  1.0
  Sm  Sm1  1  0.125  0.125  0.625  1.0
  Sm  Sm2  1  0.625  0.125  0.125  1.0
  Sm  Sm3  1  0.125  0.125  0.125  1.0
  Mn  Mn4  1  0.625  0.625  0.625  1.0
  Mn  Mn5  1  0.125  0.625  0.625  1.0
  Mn  Mn6  1  0.625  0.625  0.125  1.0
  Mn  Mn7  1  0.625  0.125  0.625  1.0
  O  O8  1  0.300  0.700  0.700  1.0
  O  O9  1  0.550  0.950  0.950  1.0
  O  O10  1  0.700  0.700  0.300  1.0
  O  O11  1  0.300  0.300  0.700  1.0
  O  O12  1  0.000  0.000  0.000  1.0
  O  O13  1  0.300  0.700  0.300  1.0
  O  O14  1  0.700  0.300  0.700  1.0
  O  O15  1  0.950  0.550  0.950  1.0
  O  O16  1  0.550  0.550  0.950  1.0
  O  O17  1  0.950  0.950  0.550  1.0
  O  O18  1  0.250  0.250  0.250  1.0
  O  O19  1  0.550  0.950  0.550  1.0
  O  O20  1  0.700  0.300  0.300  1.0
  O  O21  1  0.950  0.550  0.550  1.0
[/CIF]
.
The material described by Sm2Mn2O7 crystallizes in the cubic Fd-3m space group. Sm(1) is bonded to two equivalent O(2) and six equivalent O(1) atoms to form distorted SmO8 hexagonal bipyramids that share edges with six equivalent Sm(1)O8 hexagonal bipyramids and edges with six equivalent Mn(1)O6 octahedra. Mn(1) is bonded to six equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra and edges with six equivalent Sm(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 46°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sm(1) and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded to four equivalent Sm(1) atoms to form corner-sharing OSm4 tetrahedra. is represented by the CIF file [CIF]
data_Sm2Mn2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.110
_cell_length_b   7.110
_cell_length_c   7.110
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   254.204
_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  0.125  0.625  0.125  1.0
  Sm  Sm1  1  0.125  0.125  0.625  1.0
  Sm  Sm2  1  0.625  0.125  0.125  1.0
  Sm  Sm3  1  0.125  0.125  0.125  1.0
  Mn  Mn4  1  0.625  0.625  0.625  1.0
  Mn  Mn5  1  0.125  0.625  0.625  1.0
  Mn  Mn6  1  0.625  0.625  0.125  1.0
  Mn  Mn7  1  0.625  0.125  0.625  1.0
  O  O8  1  0.300  0.700  0.700  1.0
  O  O9  1  0.550  0.950  0.950  1.0
  O  O10  1  0.700  0.700  0.300  1.0
  O  O11  1  0.300  0.300  0.700  1.0
  O  O12  1  0.000  0.000  0.000  1.0
  O  O13  1  0.300  0.700  0.300  1.0
  O  O14  1  0.700  0.300  0.700  1.0
  O  O15  1  0.950  0.550  0.950  1.0
  O  O16  1  0.550  0.550  0.950  1.0
  O  O17  1  0.950  0.950  0.550  1.0
  O  O18  1  0.250  0.250  0.250  1.0
  O  O19  1  0.550  0.950  0.550  1.0
  O  O20  1  0.700  0.300  0.300  1.0
  O  O21  1  0.950  0.550  0.550  1.0
[/CIF]
.