The structure described by Ba2P6O17 crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded to one O(1), one O(4), one O(6), one O(8), and two equivalent O(5) atoms to form BaO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(3)O4 tetrahedra, and  an edgeedge with one Ba(1)O6 octahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(7), one O(8), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Ba(1)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 34°. In the second P site, P(2) is bonded to one O(1), one O(3), one O(4), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Ba(1)O6 octahedra and corners with two equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 14-42°. In the third P site, P(3) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Ba(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 38-54°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Ba(1) and one P(2) atom. In the second O site, O(2) is bonded in a linear geometry to two equivalent P(3) atoms. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to one Ba(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Ba(1) and one P(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Ba(1) and one P(1) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. is represented by the CIF card [CIF]
data_Ba2P6O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   19.132
_cell_length_b   6.169
_cell_length_c   8.155
_cell_angle_alpha   69.548
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   901.812
_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  0.077  0.099  0.150  1.0
  Ba  Ba1  1  0.577  0.901  0.350  1.0
  Ba  Ba2  1  0.423  0.099  0.650  1.0
  Ba  Ba3  1  0.923  0.901  0.850  1.0
  P  P4  1  0.329  0.720  0.090  1.0
  P  P5  1  0.815  0.297  0.030  1.0
  P  P6  1  0.466  0.500  0.180  1.0
  P  P7  1  0.966  0.500  0.320  1.0
  P  P8  1  0.829  0.280  0.410  1.0
  P  P9  1  0.685  0.297  0.530  1.0
  P  P10  1  0.315  0.703  0.470  1.0
  P  P11  1  0.171  0.720  0.590  1.0
  P  P12  1  0.034  0.500  0.680  1.0
  P  P13  1  0.534  0.500  0.820  1.0
  P  P14  1  0.185  0.703  0.970  1.0
  P  P15  1  0.671  0.280  0.910  1.0
  O  O16  1  0.173  0.921  0.005  1.0
  O  O17  1  0.500  0.500  0.000  1.0
  O  O18  1  0.263  0.601  0.037  1.0
  O  O19  1  0.136  0.504  0.036  1.0
  O  O20  1  0.981  0.732  0.183  1.0
  O  O21  1  0.485  0.721  0.205  1.0
  O  O22  1  0.381  0.505  0.142  1.0
  O  O23  1  0.645  0.069  0.049  1.0
  O  O24  1  0.881  0.495  0.358  1.0
  O  O25  1  0.805  0.228  0.242  1.0
  O  O26  1  0.985  0.279  0.295  1.0
  O  O27  1  0.481  0.268  0.317  1.0
  O  O28  1  0.636  0.496  0.464  1.0
  O  O29  1  0.305  0.772  0.258  1.0
  O  O30  1  0.763  0.399  0.463  1.0
  O  O31  1  0.145  0.931  0.451  1.0
  O  O32  1  0.673  0.079  0.495  1.0
  O  O33  1  0.327  0.921  0.505  1.0
  O  O34  1  0.855  0.069  0.549  1.0
  O  O35  1  0.000  0.500  0.500  1.0
  O  O36  1  0.237  0.601  0.537  1.0
  O  O37  1  0.695  0.228  0.742  1.0
  O  O38  1  0.364  0.504  0.536  1.0
  O  O39  1  0.519  0.732  0.683  1.0
  O  O40  1  0.015  0.721  0.705  1.0
  O  O41  1  0.195  0.772  0.758  1.0
  O  O42  1  0.119  0.505  0.642  1.0
  O  O43  1  0.355  0.931  0.951  1.0
  O  O44  1  0.619  0.495  0.858  1.0
  O  O45  1  0.515  0.279  0.795  1.0
  O  O46  1  0.019  0.268  0.817  1.0
  O  O47  1  0.864  0.496  0.964  1.0
  O  O48  1  0.737  0.399  0.963  1.0
  O  O49  1  0.827  0.079  0.995  1.0
[/CIF]
.
The structure described by Ba2P6O17 crystallizes in the monoclinic P2_1/c space group. Ba(1) is bonded to one O(1), one O(4), one O(6), one O(8), and two equivalent O(5) atoms to form BaO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(3)O4 tetrahedra, and  an edgeedge with one Ba(1)O6 octahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(7), one O(8), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Ba(1)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 34°. In the second P site, P(2) is bonded to one O(1), one O(3), one O(4), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Ba(1)O6 octahedra and corners with two equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 14-42°. In the third P site, P(3) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Ba(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 38-54°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Ba(1) and one P(2) atom. In the second O site, O(2) is bonded in a linear geometry to two equivalent P(3) atoms. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to one Ba(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Ba(1) and one P(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Ba(1) and one P(1) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. is represented by the CIF card [CIF]
data_Ba2P6O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   19.132
_cell_length_b   6.169
_cell_length_c   8.155
_cell_angle_alpha   69.548
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   901.812
_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  0.077  0.099  0.150  1.0
  Ba  Ba1  1  0.577  0.901  0.350  1.0
  Ba  Ba2  1  0.423  0.099  0.650  1.0
  Ba  Ba3  1  0.923  0.901  0.850  1.0
  P  P4  1  0.329  0.720  0.090  1.0
  P  P5  1  0.815  0.297  0.030  1.0
  P  P6  1  0.466  0.500  0.180  1.0
  P  P7  1  0.966  0.500  0.320  1.0
  P  P8  1  0.829  0.280  0.410  1.0
  P  P9  1  0.685  0.297  0.530  1.0
  P  P10  1  0.315  0.703  0.470  1.0
  P  P11  1  0.171  0.720  0.590  1.0
  P  P12  1  0.034  0.500  0.680  1.0
  P  P13  1  0.534  0.500  0.820  1.0
  P  P14  1  0.185  0.703  0.970  1.0
  P  P15  1  0.671  0.280  0.910  1.0
  O  O16  1  0.173  0.921  0.005  1.0
  O  O17  1  0.500  0.500  0.000  1.0
  O  O18  1  0.263  0.601  0.037  1.0
  O  O19  1  0.136  0.504  0.036  1.0
  O  O20  1  0.981  0.732  0.183  1.0
  O  O21  1  0.485  0.721  0.205  1.0
  O  O22  1  0.381  0.505  0.142  1.0
  O  O23  1  0.645  0.069  0.049  1.0
  O  O24  1  0.881  0.495  0.358  1.0
  O  O25  1  0.805  0.228  0.242  1.0
  O  O26  1  0.985  0.279  0.295  1.0
  O  O27  1  0.481  0.268  0.317  1.0
  O  O28  1  0.636  0.496  0.464  1.0
  O  O29  1  0.305  0.772  0.258  1.0
  O  O30  1  0.763  0.399  0.463  1.0
  O  O31  1  0.145  0.931  0.451  1.0
  O  O32  1  0.673  0.079  0.495  1.0
  O  O33  1  0.327  0.921  0.505  1.0
  O  O34  1  0.855  0.069  0.549  1.0
  O  O35  1  0.000  0.500  0.500  1.0
  O  O36  1  0.237  0.601  0.537  1.0
  O  O37  1  0.695  0.228  0.742  1.0
  O  O38  1  0.364  0.504  0.536  1.0
  O  O39  1  0.519  0.732  0.683  1.0
  O  O40  1  0.015  0.721  0.705  1.0
  O  O41  1  0.195  0.772  0.758  1.0
  O  O42  1  0.119  0.505  0.642  1.0
  O  O43  1  0.355  0.931  0.951  1.0
  O  O44  1  0.619  0.495  0.858  1.0
  O  O45  1  0.515  0.279  0.795  1.0
  O  O46  1  0.019  0.268  0.817  1.0
  O  O47  1  0.864  0.496  0.964  1.0
  O  O48  1  0.737  0.399  0.963  1.0
  O  O49  1  0.827  0.079  0.995  1.0
[/CIF]
.