The compound described by V2Si2O7 crystallizes in the cubic Fd-3m space group. V(1) is bonded to two equivalent O(1) and six equivalent O(2) atoms to form distorted VO8 hexagonal bipyramids that share edges with six equivalent V(1)O8 hexagonal bipyramids and edges with six equivalent Si(1)O6 octahedra. Si(1) is bonded to six equivalent O(2) atoms to form SiO6 octahedra that share corners with six equivalent Si(1)O6 octahedra and edges with six equivalent V(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 47°. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent V(1) atoms to form OV4 tetrahedra that share corners with four equivalent O(1)V4 tetrahedra, corners with twelve equivalent O(2)V2Si2 tetrahedra, and edges with six equivalent O(2)V2Si2 tetrahedra. In the second O site, O(2) is bonded to two equivalent V(1) and two equivalent Si(1) atoms to form distorted OV2Si2 tetrahedra that share corners with two equivalent O(1)V4 tetrahedra, corners with twelve equivalent O(2)V2Si2 tetrahedra,  an edgeedge with one O(1)V4 tetrahedra, and edges with four equivalent O(2)V2Si2 tetrahedra. is represented by the CIF file [CIF]
data_V2Si2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.535
_cell_length_b   6.535
_cell_length_c   6.535
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   197.373
_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
  V  V0  1  0.000  0.000  0.000  1.0
  V  V1  1  0.500  0.000  1.000  1.0
  V  V2  1  0.000  0.500  1.000  1.0
  V  V3  1  0.000  0.000  0.500  1.0
  Si  Si4  1  0.500  0.500  0.000  1.0
  Si  Si5  1  0.500  0.000  0.500  1.0
  Si  Si6  1  0.000  0.500  0.500  1.0
  Si  Si7  1  0.500  0.500  0.500  1.0
  O  O8  1  0.125  0.125  0.125  1.0
  O  O9  1  0.577  0.173  0.173  1.0
  O  O10  1  0.577  0.173  0.577  1.0
  O  O11  1  0.173  0.577  0.173  1.0
  O  O12  1  0.577  0.577  0.173  1.0
  O  O13  1  0.173  0.173  0.577  1.0
  O  O14  1  0.827  0.423  0.423  1.0
  O  O15  1  0.173  0.577  0.577  1.0
  O  O16  1  0.827  0.827  0.423  1.0
  O  O17  1  0.423  0.827  0.423  1.0
  O  O18  1  0.423  0.423  0.827  1.0
  O  O19  1  0.827  0.423  0.827  1.0
  O  O20  1  0.423  0.827  0.827  1.0
  O  O21  1  0.875  0.875  0.875  1.0
[/CIF]
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The compound described by V2Si2O7 crystallizes in the cubic Fd-3m space group. V(1) is bonded to two equivalent O(1) and six equivalent O(2) atoms to form distorted VO8 hexagonal bipyramids that share edges with six equivalent V(1)O8 hexagonal bipyramids and edges with six equivalent Si(1)O6 octahedra. Si(1) is bonded to six equivalent O(2) atoms to form SiO6 octahedra that share corners with six equivalent Si(1)O6 octahedra and edges with six equivalent V(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 47°. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent V(1) atoms to form OV4 tetrahedra that share corners with four equivalent O(1)V4 tetrahedra, corners with twelve equivalent O(2)V2Si2 tetrahedra, and edges with six equivalent O(2)V2Si2 tetrahedra. In the second O site, O(2) is bonded to two equivalent V(1) and two equivalent Si(1) atoms to form distorted OV2Si2 tetrahedra that share corners with two equivalent O(1)V4 tetrahedra, corners with twelve equivalent O(2)V2Si2 tetrahedra,  an edgeedge with one O(1)V4 tetrahedra, and edges with four equivalent O(2)V2Si2 tetrahedra. is represented by the CIF file [CIF]
data_V2Si2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.535
_cell_length_b   6.535
_cell_length_c   6.535
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   197.373
_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
  V  V0  1  0.000  0.000  0.000  1.0
  V  V1  1  0.500  0.000  1.000  1.0
  V  V2  1  0.000  0.500  1.000  1.0
  V  V3  1  0.000  0.000  0.500  1.0
  Si  Si4  1  0.500  0.500  0.000  1.0
  Si  Si5  1  0.500  0.000  0.500  1.0
  Si  Si6  1  0.000  0.500  0.500  1.0
  Si  Si7  1  0.500  0.500  0.500  1.0
  O  O8  1  0.125  0.125  0.125  1.0
  O  O9  1  0.577  0.173  0.173  1.0
  O  O10  1  0.577  0.173  0.577  1.0
  O  O11  1  0.173  0.577  0.173  1.0
  O  O12  1  0.577  0.577  0.173  1.0
  O  O13  1  0.173  0.173  0.577  1.0
  O  O14  1  0.827  0.423  0.423  1.0
  O  O15  1  0.173  0.577  0.577  1.0
  O  O16  1  0.827  0.827  0.423  1.0
  O  O17  1  0.423  0.827  0.423  1.0
  O  O18  1  0.423  0.423  0.827  1.0
  O  O19  1  0.827  0.423  0.827  1.0
  O  O20  1  0.423  0.827  0.827  1.0
  O  O21  1  0.875  0.875  0.875  1.0
[/CIF]
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