The material structure described by Sr2VP2O9 crystallizes in the monoclinic Cc space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(5), one O(6), one O(9), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. V(1) is bonded to one O(5), one O(6), one O(7), one O(8), and two equivalent O(9) atoms to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-51°. In the second P site, P(2) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-45°. There are nine inequivalent O sites. In the first O site, O(7) is bonded in a 3-coordinate geometry to one Sr(2), one V(1), and one P(2) atom. In the second O site, O(8) is bonded in a 3-coordinate geometry to one Sr(2), one V(1), and one P(2) atom. In the third O site, O(9) is bonded in a 3-coordinate geometry to one Sr(1) and two equivalent V(1) atoms. In the fourth O site, O(1) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(1) atom. In the fifth O site, O(2) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(1) atom. In the sixth O site, O(3) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(2) atom. In the seventh O site, O(4) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(2) atom. In the eighth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one P(1) atom. In the ninth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one P(1) atom. is represented by the CIF file [CIF]
data_Sr2VP2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.725
_cell_length_b   6.990
_cell_length_c   8.728
_cell_angle_alpha   76.325
_cell_angle_beta   77.599
_cell_angle_gamma   115.201
_symmetry_Int_Tables_number   1
_cell_volume   336.745
_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
  Sr  Sr0  1  0.208  0.955  0.085  1.0
  Sr  Sr1  1  0.793  0.040  0.915  1.0
  Sr  Sr2  1  0.628  0.375  0.249  1.0
  Sr  Sr3  1  0.377  0.625  0.751  1.0
  V  V4  1  0.004  0.981  0.491  1.0
  V  V5  1  0.995  0.473  0.509  1.0
  P  P6  1  0.829  0.578  0.844  1.0
  P  P7  1  0.173  0.422  0.156  1.0
  P  P8  1  0.412  0.163  0.673  1.0
  P  P9  1  0.585  0.836  0.327  1.0
  O  O10  1  0.952  0.686  0.952  1.0
  O  O11  1  0.596  0.361  0.950  1.0
  O  O12  1  0.047  0.312  0.050  1.0
  O  O13  1  0.405  0.638  0.048  1.0
  O  O14  1  0.746  0.783  0.214  1.0
  O  O15  1  0.534  0.999  0.216  1.0
  O  O16  1  0.250  0.215  0.784  1.0
  O  O17  1  0.461  0.997  0.786  1.0
  O  O18  1  0.982  0.515  0.727  1.0
  O  O19  1  0.796  0.760  0.726  1.0
  O  O20  1  0.022  0.486  0.274  1.0
  O  O21  1  0.210  0.242  0.273  1.0
  O  O22  1  0.707  0.934  0.445  1.0
  O  O23  1  0.348  0.619  0.449  1.0
  O  O24  1  0.297  0.068  0.551  1.0
  O  O25  1  0.652  0.380  0.555  1.0
  O  O26  1  0.034  0.789  0.420  1.0
  O  O27  1  0.954  0.208  0.580  1.0
[/CIF]
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The material structure described by Sr2VP2O9 crystallizes in the monoclinic Cc space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(5), one O(6), one O(9), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. V(1) is bonded to one O(5), one O(6), one O(7), one O(8), and two equivalent O(9) atoms to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-51°. In the second P site, P(2) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-45°. There are nine inequivalent O sites. In the first O site, O(7) is bonded in a 3-coordinate geometry to one Sr(2), one V(1), and one P(2) atom. In the second O site, O(8) is bonded in a 3-coordinate geometry to one Sr(2), one V(1), and one P(2) atom. In the third O site, O(9) is bonded in a 3-coordinate geometry to one Sr(1) and two equivalent V(1) atoms. In the fourth O site, O(1) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(1) atom. In the fifth O site, O(2) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(1) atom. In the sixth O site, O(3) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(2) atom. In the seventh O site, O(4) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(2) atom. In the eighth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one P(1) atom. In the ninth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one P(1) atom. is represented by the CIF file [CIF]
data_Sr2VP2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.725
_cell_length_b   6.990
_cell_length_c   8.728
_cell_angle_alpha   76.325
_cell_angle_beta   77.599
_cell_angle_gamma   115.201
_symmetry_Int_Tables_number   1
_cell_volume   336.745
_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
  Sr  Sr0  1  0.208  0.955  0.085  1.0
  Sr  Sr1  1  0.793  0.040  0.915  1.0
  Sr  Sr2  1  0.628  0.375  0.249  1.0
  Sr  Sr3  1  0.377  0.625  0.751  1.0
  V  V4  1  0.004  0.981  0.491  1.0
  V  V5  1  0.995  0.473  0.509  1.0
  P  P6  1  0.829  0.578  0.844  1.0
  P  P7  1  0.173  0.422  0.156  1.0
  P  P8  1  0.412  0.163  0.673  1.0
  P  P9  1  0.585  0.836  0.327  1.0
  O  O10  1  0.952  0.686  0.952  1.0
  O  O11  1  0.596  0.361  0.950  1.0
  O  O12  1  0.047  0.312  0.050  1.0
  O  O13  1  0.405  0.638  0.048  1.0
  O  O14  1  0.746  0.783  0.214  1.0
  O  O15  1  0.534  0.999  0.216  1.0
  O  O16  1  0.250  0.215  0.784  1.0
  O  O17  1  0.461  0.997  0.786  1.0
  O  O18  1  0.982  0.515  0.727  1.0
  O  O19  1  0.796  0.760  0.726  1.0
  O  O20  1  0.022  0.486  0.274  1.0
  O  O21  1  0.210  0.242  0.273  1.0
  O  O22  1  0.707  0.934  0.445  1.0
  O  O23  1  0.348  0.619  0.449  1.0
  O  O24  1  0.297  0.068  0.551  1.0
  O  O25  1  0.652  0.380  0.555  1.0
  O  O26  1  0.034  0.789  0.420  1.0
  O  O27  1  0.954  0.208  0.580  1.0
[/CIF]
.