The crystal structure described by Ba2VP2O11 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(2), one O(6), one O(7), two equivalent O(1), two equivalent O(11), and two equivalent O(8) atoms. In the second Ba site, Ba(2) is bonded in a 11-coordinate geometry to one O(2), one O(4), one O(6), one O(8), one O(9), two equivalent O(10), two equivalent O(3), and two equivalent O(5) atoms. V(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form distorted VO5 trigonal bipyramids that share  a cornercorner with one P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one V(1)O5 trigonal bipyramid. In the second P site, P(2) is bonded to one O(10), one O(4), one O(5), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent V(1)O5 trigonal bipyramids. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to two equivalent Ba(1) and one V(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one V(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to two equivalent Ba(2), one V(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ba(2), one V(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(2), one V(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Ba(1) and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one P(1) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Ba(2) and one P(2) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to two equivalent Ba(2) and one P(2) atom. In the eleventh O site, O(11) is bonded in a water-like geometry to two equivalent Ba(1) atoms. is represented by the CIF file [CIF]
data_Ba2VP2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.926
_cell_length_b   5.172
_cell_length_c   10.598
_cell_angle_alpha   88.028
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   488.959
_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
  Ba  Ba0  1  0.011  0.025  0.952  1.0
  Ba  Ba1  1  0.511  0.975  0.048  1.0
  Ba  Ba2  1  0.651  0.999  0.620  1.0
  Ba  Ba3  1  0.151  0.001  0.380  1.0
  V  V4  1  0.995  0.445  0.672  1.0
  V  V5  1  0.495  0.555  0.328  1.0
  P  P6  1  0.715  0.500  0.856  1.0
  P  P7  1  0.215  0.500  0.144  1.0
  P  P8  1  0.351  0.457  0.589  1.0
  P  P9  1  0.851  0.543  0.411  1.0
  O  O10  1  0.072  0.554  0.801  1.0
  O  O11  1  0.572  0.446  0.199  1.0
  O  O12  1  0.957  0.131  0.700  1.0
  O  O13  1  0.457  0.869  0.300  1.0
  O  O14  1  0.784  0.544  0.718  1.0
  O  O15  1  0.284  0.456  0.282  1.0
  O  O16  1  0.183  0.380  0.572  1.0
  O  O17  1  0.683  0.620  0.428  1.0
  O  O18  1  0.939  0.673  0.523  1.0
  O  O19  1  0.439  0.327  0.477  1.0
  O  O20  1  0.565  0.649  0.853  1.0
  O  O21  1  0.065  0.351  0.147  1.0
  O  O22  1  0.813  0.628  0.955  1.0
  O  O23  1  0.313  0.372  0.045  1.0
  O  O24  1  0.704  0.207  0.881  1.0
  O  O25  1  0.204  0.793  0.119  1.0
  O  O26  1  0.420  0.329  0.711  1.0
  O  O27  1  0.920  0.671  0.289  1.0
  O  O28  1  0.373  0.748  0.578  1.0
  O  O29  1  0.873  0.252  0.422  1.0
  O  O30  1  0.308  0.064  0.837  1.0
  O  O31  1  0.808  0.936  0.163  1.0
[/CIF]
.
The crystal structure described by Ba2VP2O11 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(2), one O(6), one O(7), two equivalent O(1), two equivalent O(11), and two equivalent O(8) atoms. In the second Ba site, Ba(2) is bonded in a 11-coordinate geometry to one O(2), one O(4), one O(6), one O(8), one O(9), two equivalent O(10), two equivalent O(3), and two equivalent O(5) atoms. V(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form distorted VO5 trigonal bipyramids that share  a cornercorner with one P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one V(1)O5 trigonal bipyramid. In the second P site, P(2) is bonded to one O(10), one O(4), one O(5), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent V(1)O5 trigonal bipyramids. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to two equivalent Ba(1) and one V(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one V(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to two equivalent Ba(2), one V(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ba(2), one V(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(2), one V(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Ba(1) and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one P(1) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Ba(2) and one P(2) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to two equivalent Ba(2) and one P(2) atom. In the eleventh O site, O(11) is bonded in a water-like geometry to two equivalent Ba(1) atoms. is represented by the CIF file [CIF]
data_Ba2VP2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.926
_cell_length_b   5.172
_cell_length_c   10.598
_cell_angle_alpha   88.028
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   488.959
_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
  Ba  Ba0  1  0.011  0.025  0.952  1.0
  Ba  Ba1  1  0.511  0.975  0.048  1.0
  Ba  Ba2  1  0.651  0.999  0.620  1.0
  Ba  Ba3  1  0.151  0.001  0.380  1.0
  V  V4  1  0.995  0.445  0.672  1.0
  V  V5  1  0.495  0.555  0.328  1.0
  P  P6  1  0.715  0.500  0.856  1.0
  P  P7  1  0.215  0.500  0.144  1.0
  P  P8  1  0.351  0.457  0.589  1.0
  P  P9  1  0.851  0.543  0.411  1.0
  O  O10  1  0.072  0.554  0.801  1.0
  O  O11  1  0.572  0.446  0.199  1.0
  O  O12  1  0.957  0.131  0.700  1.0
  O  O13  1  0.457  0.869  0.300  1.0
  O  O14  1  0.784  0.544  0.718  1.0
  O  O15  1  0.284  0.456  0.282  1.0
  O  O16  1  0.183  0.380  0.572  1.0
  O  O17  1  0.683  0.620  0.428  1.0
  O  O18  1  0.939  0.673  0.523  1.0
  O  O19  1  0.439  0.327  0.477  1.0
  O  O20  1  0.565  0.649  0.853  1.0
  O  O21  1  0.065  0.351  0.147  1.0
  O  O22  1  0.813  0.628  0.955  1.0
  O  O23  1  0.313  0.372  0.045  1.0
  O  O24  1  0.704  0.207  0.881  1.0
  O  O25  1  0.204  0.793  0.119  1.0
  O  O26  1  0.420  0.329  0.711  1.0
  O  O27  1  0.920  0.671  0.289  1.0
  O  O28  1  0.373  0.748  0.578  1.0
  O  O29  1  0.873  0.252  0.422  1.0
  O  O30  1  0.308  0.064  0.837  1.0
  O  O31  1  0.808  0.936  0.163  1.0
[/CIF]
.