The material described by VSiP2O9 crystallizes in the tetragonal P4/ncc space group. V(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(3) atoms. Si(1) is bonded to four equivalent O(1) atoms to form SiO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra. P(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form PO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to two equivalent V(1) atoms. In the second O site, O(3) is bonded in a bent 150 degrees geometry to one V(1) and one P(1) atom. In the third O site, O(1) is bonded in a bent 150 degrees geometry to one Si(1) and one P(1) atom. is represented by the CIF file [CIF]
data_VSiP2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.953
_cell_length_b   8.953
_cell_length_c   8.339
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   668.403
_cell_formula_units_Z   4
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  0.500  0.000  0.841  1.0
  V  V1  1  0.000  0.500  0.659  1.0
  V  V2  1  0.000  0.500  0.159  1.0
  V  V3  1  0.500  0.000  0.341  1.0
  Si  Si4  1  0.500  0.500  0.500  1.0
  Si  Si5  1  0.000  0.000  0.500  1.0
  Si  Si6  1  0.000  0.000  0.000  1.0
  Si  Si7  1  0.500  0.500  0.000  1.0
  P  P8  1  0.178  0.178  0.750  1.0
  P  P9  1  0.678  0.322  0.750  1.0
  P  P10  1  0.322  0.678  0.750  1.0
  P  P11  1  0.822  0.822  0.750  1.0
  P  P12  1  0.322  0.322  0.250  1.0
  P  P13  1  0.822  0.178  0.250  1.0
  P  P14  1  0.178  0.822  0.250  1.0
  P  P15  1  0.678  0.678  0.250  1.0
  O  O16  1  0.634  0.433  0.891  1.0
  O  O17  1  0.366  0.567  0.891  1.0
  O  O18  1  0.067  0.134  0.891  1.0
  O  O19  1  0.933  0.866  0.891  1.0
  O  O20  1  0.433  0.634  0.609  1.0
  O  O21  1  0.134  0.067  0.609  1.0
  O  O22  1  0.866  0.933  0.609  1.0
  O  O23  1  0.567  0.366  0.609  1.0
  O  O24  1  0.866  0.067  0.109  1.0
  O  O25  1  0.134  0.933  0.109  1.0
  O  O26  1  0.433  0.366  0.109  1.0
  O  O27  1  0.567  0.634  0.109  1.0
  O  O28  1  0.067  0.866  0.391  1.0
  O  O29  1  0.366  0.433  0.391  1.0
  O  O30  1  0.634  0.567  0.391  1.0
  O  O31  1  0.933  0.134  0.391  1.0
  O  O32  1  0.500  0.000  0.537  1.0
  O  O33  1  0.000  0.500  0.963  1.0
  O  O34  1  0.000  0.500  0.463  1.0
  O  O35  1  0.500  0.000  0.037  1.0
  O  O36  1  0.662  0.150  0.297  1.0
  O  O37  1  0.650  0.838  0.297  1.0
  O  O38  1  0.350  0.162  0.297  1.0
  O  O39  1  0.338  0.850  0.297  1.0
  O  O40  1  0.838  0.650  0.203  1.0
  O  O41  1  0.162  0.350  0.203  1.0
  O  O42  1  0.150  0.662  0.203  1.0
  O  O43  1  0.850  0.338  0.203  1.0
  O  O44  1  0.838  0.350  0.703  1.0
  O  O45  1  0.850  0.662  0.703  1.0
  O  O46  1  0.150  0.338  0.703  1.0
  O  O47  1  0.162  0.650  0.703  1.0
  O  O48  1  0.662  0.850  0.797  1.0
  O  O49  1  0.338  0.150  0.797  1.0
  O  O50  1  0.350  0.838  0.797  1.0
  O  O51  1  0.650  0.162  0.797  1.0
[/CIF]
.
The material described by VSiP2O9 crystallizes in the tetragonal P4/ncc space group. V(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(3) atoms. Si(1) is bonded to four equivalent O(1) atoms to form SiO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra. P(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form PO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to two equivalent V(1) atoms. In the second O site, O(3) is bonded in a bent 150 degrees geometry to one V(1) and one P(1) atom. In the third O site, O(1) is bonded in a bent 150 degrees geometry to one Si(1) and one P(1) atom. is represented by the CIF file [CIF]
data_VSiP2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.953
_cell_length_b   8.953
_cell_length_c   8.339
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   668.403
_cell_formula_units_Z   4
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  0.500  0.000  0.841  1.0
  V  V1  1  0.000  0.500  0.659  1.0
  V  V2  1  0.000  0.500  0.159  1.0
  V  V3  1  0.500  0.000  0.341  1.0
  Si  Si4  1  0.500  0.500  0.500  1.0
  Si  Si5  1  0.000  0.000  0.500  1.0
  Si  Si6  1  0.000  0.000  0.000  1.0
  Si  Si7  1  0.500  0.500  0.000  1.0
  P  P8  1  0.178  0.178  0.750  1.0
  P  P9  1  0.678  0.322  0.750  1.0
  P  P10  1  0.322  0.678  0.750  1.0
  P  P11  1  0.822  0.822  0.750  1.0
  P  P12  1  0.322  0.322  0.250  1.0
  P  P13  1  0.822  0.178  0.250  1.0
  P  P14  1  0.178  0.822  0.250  1.0
  P  P15  1  0.678  0.678  0.250  1.0
  O  O16  1  0.634  0.433  0.891  1.0
  O  O17  1  0.366  0.567  0.891  1.0
  O  O18  1  0.067  0.134  0.891  1.0
  O  O19  1  0.933  0.866  0.891  1.0
  O  O20  1  0.433  0.634  0.609  1.0
  O  O21  1  0.134  0.067  0.609  1.0
  O  O22  1  0.866  0.933  0.609  1.0
  O  O23  1  0.567  0.366  0.609  1.0
  O  O24  1  0.866  0.067  0.109  1.0
  O  O25  1  0.134  0.933  0.109  1.0
  O  O26  1  0.433  0.366  0.109  1.0
  O  O27  1  0.567  0.634  0.109  1.0
  O  O28  1  0.067  0.866  0.391  1.0
  O  O29  1  0.366  0.433  0.391  1.0
  O  O30  1  0.634  0.567  0.391  1.0
  O  O31  1  0.933  0.134  0.391  1.0
  O  O32  1  0.500  0.000  0.537  1.0
  O  O33  1  0.000  0.500  0.963  1.0
  O  O34  1  0.000  0.500  0.463  1.0
  O  O35  1  0.500  0.000  0.037  1.0
  O  O36  1  0.662  0.150  0.297  1.0
  O  O37  1  0.650  0.838  0.297  1.0
  O  O38  1  0.350  0.162  0.297  1.0
  O  O39  1  0.338  0.850  0.297  1.0
  O  O40  1  0.838  0.650  0.203  1.0
  O  O41  1  0.162  0.350  0.203  1.0
  O  O42  1  0.150  0.662  0.203  1.0
  O  O43  1  0.850  0.338  0.203  1.0
  O  O44  1  0.838  0.350  0.703  1.0
  O  O45  1  0.850  0.662  0.703  1.0
  O  O46  1  0.150  0.338  0.703  1.0
  O  O47  1  0.162  0.650  0.703  1.0
  O  O48  1  0.662  0.850  0.797  1.0
  O  O49  1  0.338  0.150  0.797  1.0
  O  O50  1  0.350  0.838  0.797  1.0
  O  O51  1  0.650  0.162  0.797  1.0
[/CIF]
.