The material structure described by Sm2Ge2O7 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 Ge(1)O6 octahedra. Ge(1) is bonded to six equivalent O(1) atoms to form GeO6 octahedra that share corners with six equivalent Ge(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 to two equivalent Sm(1) and two equivalent Ge(1) atoms to form distorted OSm2Ge2 tetrahedra that share corners with two equivalent O(2)Sm4 tetrahedra, corners with twelve equivalent O(1)Sm2Ge2 tetrahedra,  an edgeedge with one O(2)Sm4 tetrahedra, and edges with four equivalent O(1)Sm2Ge2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Sm(1) atoms to form OSm4 tetrahedra that share corners with four equivalent O(2)Sm4 tetrahedra, corners with twelve equivalent O(1)Sm2Ge2 tetrahedra, and edges with six equivalent O(1)Sm2Ge2 tetrahedra. is represented by the CIF card [CIF]
data_Sm2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.198
_cell_length_b   7.198
_cell_length_c   7.198
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   263.741
_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
  Ge  Ge4  1  0.625  0.625  0.625  1.0
  Ge  Ge5  1  0.125  0.625  0.625  1.0
  Ge  Ge6  1  0.625  0.125  0.625  1.0
  Ge  Ge7  1  0.625  0.625  0.125  1.0
  O  O8  1  0.299  0.701  0.701  1.0
  O  O9  1  0.549  0.951  0.951  1.0
  O  O10  1  0.701  0.299  0.701  1.0
  O  O11  1  0.000  0.000  0.000  1.0
  O  O12  1  0.299  0.701  0.299  1.0
  O  O13  1  0.701  0.701  0.299  1.0
  O  O14  1  0.299  0.299  0.701  1.0
  O  O15  1  0.250  0.250  0.250  1.0
  O  O16  1  0.549  0.549  0.951  1.0
  O  O17  1  0.951  0.549  0.951  1.0
  O  O18  1  0.951  0.951  0.549  1.0
  O  O19  1  0.549  0.951  0.549  1.0
  O  O20  1  0.701  0.299  0.299  1.0
  O  O21  1  0.951  0.549  0.549  1.0
[/CIF]
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The material structure described by Sm2Ge2O7 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 Ge(1)O6 octahedra. Ge(1) is bonded to six equivalent O(1) atoms to form GeO6 octahedra that share corners with six equivalent Ge(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 to two equivalent Sm(1) and two equivalent Ge(1) atoms to form distorted OSm2Ge2 tetrahedra that share corners with two equivalent O(2)Sm4 tetrahedra, corners with twelve equivalent O(1)Sm2Ge2 tetrahedra,  an edgeedge with one O(2)Sm4 tetrahedra, and edges with four equivalent O(1)Sm2Ge2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Sm(1) atoms to form OSm4 tetrahedra that share corners with four equivalent O(2)Sm4 tetrahedra, corners with twelve equivalent O(1)Sm2Ge2 tetrahedra, and edges with six equivalent O(1)Sm2Ge2 tetrahedra. is represented by the CIF card [CIF]
data_Sm2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.198
_cell_length_b   7.198
_cell_length_c   7.198
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   263.741
_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
  Ge  Ge4  1  0.625  0.625  0.625  1.0
  Ge  Ge5  1  0.125  0.625  0.625  1.0
  Ge  Ge6  1  0.625  0.125  0.625  1.0
  Ge  Ge7  1  0.625  0.625  0.125  1.0
  O  O8  1  0.299  0.701  0.701  1.0
  O  O9  1  0.549  0.951  0.951  1.0
  O  O10  1  0.701  0.299  0.701  1.0
  O  O11  1  0.000  0.000  0.000  1.0
  O  O12  1  0.299  0.701  0.299  1.0
  O  O13  1  0.701  0.701  0.299  1.0
  O  O14  1  0.299  0.299  0.701  1.0
  O  O15  1  0.250  0.250  0.250  1.0
  O  O16  1  0.549  0.549  0.951  1.0
  O  O17  1  0.951  0.549  0.951  1.0
  O  O18  1  0.951  0.951  0.549  1.0
  O  O19  1  0.549  0.951  0.549  1.0
  O  O20  1  0.701  0.299  0.299  1.0
  O  O21  1  0.951  0.549  0.549  1.0
[/CIF]
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