The structure described by Na2Ba6Nb2V2O17 crystallizes in the monoclinic C2 space group. Na(1) is bonded to one O(1), one O(2), one O(3), one O(6), one O(7), and one O(8) atom to form NaO6 octahedra that share corners with three equivalent Nb(1)O6 octahedra, corners with three equivalent V(1)O4 tetrahedra, and  a faceface with one Ba(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 3°. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(4), two equivalent O(5), two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one O(6), one O(7), one O(8), one O(9), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the third Ba site, Ba(3) is bonded to two equivalent O(4), two equivalent O(6), two equivalent O(7), two equivalent O(8), and four equivalent O(5) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(3)O12 cuboctahedra, faces with two equivalent Na(1)O6 octahedra, and faces with six equivalent Nb(1)O6 octahedra. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(9) atoms. Nb(1) is bonded to one O(4), one O(6), one O(7), one O(8), and two equivalent O(5) atoms to form NbO6 octahedra that share corners with three equivalent Na(1)O6 octahedra, corners with three equivalent Nb(1)O6 octahedra, and faces with three equivalent Ba(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. V(1) is bonded to one O(1), one O(2), one O(3), and one O(9) atom to form VO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-21°. There are nine inequivalent O sites. In the first O site, O(6) is bonded to one Na(1), one Ba(2), one Ba(3), two equivalent Ba(1), and one Nb(1) atom to form distorted OBa4NaNb octahedra that share  a cornercorner with one O(4)Ba4Nb2 octahedra, corners with three equivalent O(6)Ba4NaNb octahedra, corners with three equivalent O(7)Ba4NaNb octahedra, corners with three equivalent O(8)Ba4NaNb octahedra, corners with four equivalent O(5)Ba4Nb2 octahedra, edges with two equivalent O(4)Ba4Nb2 octahedra, faces with two equivalent O(7)Ba4NaNb octahedra, faces with two equivalent O(8)Ba4NaNb octahedra, and faces with two equivalent O(5)Ba4Nb2 octahedra. The corner-sharing octahedral tilt angles range from 0-64°. In the second O site, O(7) is bonded to one Na(1), one Ba(2), one Ba(3), two equivalent Ba(1), and one Nb(1) atom to form distorted OBa4NaNb octahedra that share corners with two equivalent O(4)Ba4Nb2 octahedra, corners with three equivalent O(6)Ba4NaNb octahedra, corners with three equivalent O(7)Ba4NaNb octahedra, corners with three equivalent O(8)Ba4NaNb octahedra, corners with three equivalent O(5)Ba4Nb2 octahedra, edges with two equivalent O(5)Ba4Nb2 octahedra,  a faceface with one O(4)Ba4Nb2 octahedra,  a faceface with one O(5)Ba4Nb2 octahedra, faces with two equivalent O(6)Ba4NaNb octahedra, and faces with two equivalent O(8)Ba4NaNb octahedra. The corner-sharing octahedral tilt angles range from 0-64°. In the third O site, O(8) is bonded to one Na(1), one Ba(2), one Ba(3), two equivalent Ba(1), and one Nb(1) atom to form distorted OBa4NaNb octahedra that share corners with two equivalent O(4)Ba4Nb2 octahedra, corners with three equivalent O(6)Ba4NaNb octahedra, corners with three equivalent O(7)Ba4NaNb octahedra, corners with three equivalent O(8)Ba4NaNb octahedra, corners with three equivalent O(5)Ba4Nb2 octahedra, edges with two equivalent O(5)Ba4Nb2 octahedra,  a faceface with one O(4)Ba4Nb2 octahedra,  a faceface with one O(5)Ba4Nb2 octahedra, faces with two equivalent O(6)Ba4NaNb octahedra, and faces with two equivalent O(7)Ba4NaNb octahedra. The corner-sharing octahedral tilt angles range from 0-64°. In the fourth O site, O(9) is bonded in a 1-coordinate geometry to one Ba(2), one Ba(4), and one V(1) atom. In the fifth O site, O(1) is bonded in a 1-coordinate geometry to one Na(1), one Ba(4), two equivalent Ba(2), and one V(1) atom. In the sixth O site, O(2) is bonded in a 2-coordinate geometry to one Na(1), one Ba(4), two equivalent Ba(2), and one V(1) atom. In the seventh O site, O(3) is bonded in a 1-coordinate geometry to one Na(1), one Ba(4), two equivalent Ba(2), and one V(1) atom. In the eighth O site, O(4) is bonded to two equivalent Ba(1), two equivalent Ba(3), and two equivalent Nb(1) atoms to form distorted OBa4Nb2 octahedra that share corners with two equivalent O(6)Ba4NaNb octahedra, corners with two equivalent O(4)Ba4Nb2 octahedra, corners with four equivalent O(7)Ba4NaNb octahedra, corners with four equivalent O(8)Ba4NaNb octahedra, corners with four equivalent O(5)Ba4Nb2 octahedra, edges with four equivalent O(6)Ba4NaNb octahedra, faces with two equivalent O(7)Ba4NaNb octahedra, faces with two equivalent O(8)Ba4NaNb octahedra, and faces with four equivalent O(5)Ba4Nb2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. In the ninth O site, O(5) is bonded to two equivalent Ba(1), two equivalent Ba(3), and two equivalent Nb(1) atoms to form distorted OBa4Nb2 octahedra that share corners with two equivalent O(4)Ba4Nb2 octahedra, corners with three equivalent O(7)Ba4NaNb octahedra, corners with three equivalent O(8)Ba4NaNb octahedra, corners with four equivalent O(6)Ba4NaNb octahedra, corners with four equivalent O(5)Ba4Nb2 octahedra, edges with two equivalent O(7)Ba4NaNb octahedra, edges with two equivalent O(8)Ba4NaNb octahedra,  a faceface with one O(7)Ba4NaNb octahedra,  a faceface with one O(8)Ba4NaNb octahedra, faces with two equivalent O(6)Ba4NaNb octahedra, faces with two equivalent O(4)Ba4Nb2 octahedra, and faces with two equivalent O(5)Ba4Nb2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba6Na2Nb2V2O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.972
_cell_length_b   5.972
_cell_length_c   15.055
_cell_angle_alpha   89.812
_cell_angle_beta   89.812
_cell_angle_gamma   59.862
_symmetry_Int_Tables_number   1
_cell_volume   464.380
_cell_formula_units_Z   1
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  0.666  0.667  0.651  1.0
  Ba  Ba1  1  0.333  0.334  0.349  1.0
  Ba  Ba2  1  0.332  0.334  0.814  1.0
  Ba  Ba3  1  0.666  0.668  0.186  1.0
  Ba  Ba4  1  0.000  1.000  0.500  1.0
  Ba  Ba5  1  0.008  0.992  0.000  1.0
  Na  Na6  1  0.999  0.000  0.748  1.0
  Na  Na7  1  1.000  0.001  0.252  1.0
  Nb  Nb8  1  0.333  0.333  0.587  1.0
  Nb  Nb9  1  0.667  0.667  0.413  1.0
  V  V10  1  0.660  0.670  0.896  1.0
  V  V11  1  0.330  0.340  0.104  1.0
  O  O12  1  0.822  0.826  0.855  1.0
  O  O13  1  0.349  0.827  0.850  1.0
  O  O14  1  0.824  0.352  0.856  1.0
  O  O15  1  0.174  0.178  0.145  1.0
  O  O16  1  0.648  0.176  0.144  1.0
  O  O17  1  0.173  0.651  0.150  1.0
  O  O18  1  0.500  0.500  0.500  1.0
  O  O19  1  0.000  0.500  0.500  1.0
  O  O20  1  0.500  1.000  0.500  1.0
  O  O21  1  0.177  0.178  0.657  1.0
  O  O22  1  0.645  0.177  0.657  1.0
  O  O23  1  0.177  0.645  0.657  1.0
  O  O24  1  0.822  0.823  0.343  1.0
  O  O25  1  0.355  0.823  0.343  1.0
  O  O26  1  0.823  0.355  0.343  1.0
  O  O27  1  0.636  0.685  0.010  1.0
  O  O28  1  0.315  0.364  0.990  1.0
[/CIF]
.
The structure described by Na2Ba6Nb2V2O17 crystallizes in the monoclinic C2 space group. Na(1) is bonded to one O(1), one O(2), one O(3), one O(6), one O(7), and one O(8) atom to form NaO6 octahedra that share corners with three equivalent Nb(1)O6 octahedra, corners with three equivalent V(1)O4 tetrahedra, and  a faceface with one Ba(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 3°. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(4), two equivalent O(5), two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one O(6), one O(7), one O(8), one O(9), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the third Ba site, Ba(3) is bonded to two equivalent O(4), two equivalent O(6), two equivalent O(7), two equivalent O(8), and four equivalent O(5) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(3)O12 cuboctahedra, faces with two equivalent Na(1)O6 octahedra, and faces with six equivalent Nb(1)O6 octahedra. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(9) atoms. Nb(1) is bonded to one O(4), one O(6), one O(7), one O(8), and two equivalent O(5) atoms to form NbO6 octahedra that share corners with three equivalent Na(1)O6 octahedra, corners with three equivalent Nb(1)O6 octahedra, and faces with three equivalent Ba(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. V(1) is bonded to one O(1), one O(2), one O(3), and one O(9) atom to form VO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-21°. There are nine inequivalent O sites. In the first O site, O(6) is bonded to one Na(1), one Ba(2), one Ba(3), two equivalent Ba(1), and one Nb(1) atom to form distorted OBa4NaNb octahedra that share  a cornercorner with one O(4)Ba4Nb2 octahedra, corners with three equivalent O(6)Ba4NaNb octahedra, corners with three equivalent O(7)Ba4NaNb octahedra, corners with three equivalent O(8)Ba4NaNb octahedra, corners with four equivalent O(5)Ba4Nb2 octahedra, edges with two equivalent O(4)Ba4Nb2 octahedra, faces with two equivalent O(7)Ba4NaNb octahedra, faces with two equivalent O(8)Ba4NaNb octahedra, and faces with two equivalent O(5)Ba4Nb2 octahedra. The corner-sharing octahedral tilt angles range from 0-64°. In the second O site, O(7) is bonded to one Na(1), one Ba(2), one Ba(3), two equivalent Ba(1), and one Nb(1) atom to form distorted OBa4NaNb octahedra that share corners with two equivalent O(4)Ba4Nb2 octahedra, corners with three equivalent O(6)Ba4NaNb octahedra, corners with three equivalent O(7)Ba4NaNb octahedra, corners with three equivalent O(8)Ba4NaNb octahedra, corners with three equivalent O(5)Ba4Nb2 octahedra, edges with two equivalent O(5)Ba4Nb2 octahedra,  a faceface with one O(4)Ba4Nb2 octahedra,  a faceface with one O(5)Ba4Nb2 octahedra, faces with two equivalent O(6)Ba4NaNb octahedra, and faces with two equivalent O(8)Ba4NaNb octahedra. The corner-sharing octahedral tilt angles range from 0-64°. In the third O site, O(8) is bonded to one Na(1), one Ba(2), one Ba(3), two equivalent Ba(1), and one Nb(1) atom to form distorted OBa4NaNb octahedra that share corners with two equivalent O(4)Ba4Nb2 octahedra, corners with three equivalent O(6)Ba4NaNb octahedra, corners with three equivalent O(7)Ba4NaNb octahedra, corners with three equivalent O(8)Ba4NaNb octahedra, corners with three equivalent O(5)Ba4Nb2 octahedra, edges with two equivalent O(5)Ba4Nb2 octahedra,  a faceface with one O(4)Ba4Nb2 octahedra,  a faceface with one O(5)Ba4Nb2 octahedra, faces with two equivalent O(6)Ba4NaNb octahedra, and faces with two equivalent O(7)Ba4NaNb octahedra. The corner-sharing octahedral tilt angles range from 0-64°. In the fourth O site, O(9) is bonded in a 1-coordinate geometry to one Ba(2), one Ba(4), and one V(1) atom. In the fifth O site, O(1) is bonded in a 1-coordinate geometry to one Na(1), one Ba(4), two equivalent Ba(2), and one V(1) atom. In the sixth O site, O(2) is bonded in a 2-coordinate geometry to one Na(1), one Ba(4), two equivalent Ba(2), and one V(1) atom. In the seventh O site, O(3) is bonded in a 1-coordinate geometry to one Na(1), one Ba(4), two equivalent Ba(2), and one V(1) atom. In the eighth O site, O(4) is bonded to two equivalent Ba(1), two equivalent Ba(3), and two equivalent Nb(1) atoms to form distorted OBa4Nb2 octahedra that share corners with two equivalent O(6)Ba4NaNb octahedra, corners with two equivalent O(4)Ba4Nb2 octahedra, corners with four equivalent O(7)Ba4NaNb octahedra, corners with four equivalent O(8)Ba4NaNb octahedra, corners with four equivalent O(5)Ba4Nb2 octahedra, edges with four equivalent O(6)Ba4NaNb octahedra, faces with two equivalent O(7)Ba4NaNb octahedra, faces with two equivalent O(8)Ba4NaNb octahedra, and faces with four equivalent O(5)Ba4Nb2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. In the ninth O site, O(5) is bonded to two equivalent Ba(1), two equivalent Ba(3), and two equivalent Nb(1) atoms to form distorted OBa4Nb2 octahedra that share corners with two equivalent O(4)Ba4Nb2 octahedra, corners with three equivalent O(7)Ba4NaNb octahedra, corners with three equivalent O(8)Ba4NaNb octahedra, corners with four equivalent O(6)Ba4NaNb octahedra, corners with four equivalent O(5)Ba4Nb2 octahedra, edges with two equivalent O(7)Ba4NaNb octahedra, edges with two equivalent O(8)Ba4NaNb octahedra,  a faceface with one O(7)Ba4NaNb octahedra,  a faceface with one O(8)Ba4NaNb octahedra, faces with two equivalent O(6)Ba4NaNb octahedra, faces with two equivalent O(4)Ba4Nb2 octahedra, and faces with two equivalent O(5)Ba4Nb2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba6Na2Nb2V2O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.972
_cell_length_b   5.972
_cell_length_c   15.055
_cell_angle_alpha   89.812
_cell_angle_beta   89.812
_cell_angle_gamma   59.862
_symmetry_Int_Tables_number   1
_cell_volume   464.380
_cell_formula_units_Z   1
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  0.666  0.667  0.651  1.0
  Ba  Ba1  1  0.333  0.334  0.349  1.0
  Ba  Ba2  1  0.332  0.334  0.814  1.0
  Ba  Ba3  1  0.666  0.668  0.186  1.0
  Ba  Ba4  1  0.000  1.000  0.500  1.0
  Ba  Ba5  1  0.008  0.992  0.000  1.0
  Na  Na6  1  0.999  0.000  0.748  1.0
  Na  Na7  1  1.000  0.001  0.252  1.0
  Nb  Nb8  1  0.333  0.333  0.587  1.0
  Nb  Nb9  1  0.667  0.667  0.413  1.0
  V  V10  1  0.660  0.670  0.896  1.0
  V  V11  1  0.330  0.340  0.104  1.0
  O  O12  1  0.822  0.826  0.855  1.0
  O  O13  1  0.349  0.827  0.850  1.0
  O  O14  1  0.824  0.352  0.856  1.0
  O  O15  1  0.174  0.178  0.145  1.0
  O  O16  1  0.648  0.176  0.144  1.0
  O  O17  1  0.173  0.651  0.150  1.0
  O  O18  1  0.500  0.500  0.500  1.0
  O  O19  1  0.000  0.500  0.500  1.0
  O  O20  1  0.500  1.000  0.500  1.0
  O  O21  1  0.177  0.178  0.657  1.0
  O  O22  1  0.645  0.177  0.657  1.0
  O  O23  1  0.177  0.645  0.657  1.0
  O  O24  1  0.822  0.823  0.343  1.0
  O  O25  1  0.355  0.823  0.343  1.0
  O  O26  1  0.823  0.355  0.343  1.0
  O  O27  1  0.636  0.685  0.010  1.0
  O  O28  1  0.315  0.364  0.990  1.0
[/CIF]
.