The material described by Na2V6O15 crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one O(14), one O(3), and two equivalent O(4) atoms. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(1), one O(12), and two equivalent O(11) atoms. There are six inequivalent V sites. In the first V site, V(1) is bonded in a 6-coordinate geometry to one O(1), one O(13), one O(5), one O(6), and two equivalent O(2) atoms. In the second V site, V(2) is bonded in a 6-coordinate geometry to one O(10), one O(15), one O(2), one O(4), and two equivalent O(6) atoms. In the third V site, V(3) is bonded in a 5-coordinate geometry to one O(3), one O(5), one O(8), and two equivalent O(7) atoms. In the fourth V site, V(4) is bonded in a 5-coordinate geometry to one O(10), one O(12), one O(7), and two equivalent O(8) atoms. In the fifth V site, V(5) is bonded in a 6-coordinate geometry to one O(11), one O(13), one O(15), one O(5), and two equivalent O(9) atoms. In the sixth V site, V(6) is bonded in a 6-coordinate geometry to one O(10), one O(14), one O(2), one O(9), and two equivalent O(13) atoms. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Na(2) and one V(1) atom. In the second O site, O(2) is bonded to one V(2), one V(6), and two equivalent V(1) atoms to form a mixture of distorted edge and corner-sharing OV4 tetrahedra. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one V(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one V(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one V(1), one V(3), and one V(5) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one V(1) and two equivalent V(2) atoms. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one V(4) and two equivalent V(3) atoms. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one V(3) and two equivalent V(4) atoms. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one V(6) and two equivalent V(5) atoms. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one V(2), one V(4), and one V(6) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to two equivalent Na(2) and one V(5) atom. In the twelfth O site, O(12) is bonded in a 2-coordinate geometry to one Na(2) and one V(4) atom. In the thirteenth O site, O(13) is bonded to one V(1), one V(5), and two equivalent V(6) atoms to form a mixture of distorted edge and corner-sharing OV4 trigonal pyramids. In the fourteenth O site, O(14) is bonded in a linear geometry to one Na(1) and one V(6) atom. In the fifteenth O site, O(15) is bonded in a linear geometry to one V(2) and one V(5) atom. is represented by the CIF file [CIF]
data_Na2V6O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.644
_cell_length_b   8.160
_cell_length_c   10.485
_cell_angle_alpha   76.724
_cell_angle_beta   89.822
_cell_angle_gamma   77.152
_symmetry_Int_Tables_number   1
_cell_volume   295.456
_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
  Na  Na0  1  0.542  0.911  0.344  1.0
  Na  Na1  1  0.456  0.091  0.657  1.0
  V  V2  1  0.674  0.653  0.902  1.0
  V  V3  1  0.106  0.785  0.101  1.0
  V  V4  1  0.715  0.564  0.600  1.0
  V  V5  1  0.285  0.433  0.402  1.0
  V  V6  1  0.889  0.219  0.897  1.0
  V  V7  1  0.323  0.347  0.098  1.0
  O  O8  1  0.585  0.841  0.803  1.0
  O  O9  1  0.189  0.621  0.958  1.0
  O  O10  1  0.611  0.775  0.559  1.0
  O  O11  1  0.093  0.810  0.254  1.0
  O  O12  1  0.744  0.516  0.781  1.0
  O  O13  1  0.628  0.741  0.074  1.0
  O  O14  1  0.249  0.498  0.579  1.0
  O  O15  1  0.752  0.497  0.424  1.0
  O  O16  1  0.369  0.259  0.927  1.0
  O  O17  1  0.259  0.481  0.221  1.0
  O  O18  1  0.901  0.195  0.745  1.0
  O  O19  1  0.391  0.221  0.443  1.0
  O  O20  1  0.807  0.381  0.043  1.0
  O  O21  1  0.414  0.157  0.197  1.0
  O  O22  1  1.000  0.001  0.999  1.0
[/CIF]
.
The material described by Na2V6O15 crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one O(14), one O(3), and two equivalent O(4) atoms. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(1), one O(12), and two equivalent O(11) atoms. There are six inequivalent V sites. In the first V site, V(1) is bonded in a 6-coordinate geometry to one O(1), one O(13), one O(5), one O(6), and two equivalent O(2) atoms. In the second V site, V(2) is bonded in a 6-coordinate geometry to one O(10), one O(15), one O(2), one O(4), and two equivalent O(6) atoms. In the third V site, V(3) is bonded in a 5-coordinate geometry to one O(3), one O(5), one O(8), and two equivalent O(7) atoms. In the fourth V site, V(4) is bonded in a 5-coordinate geometry to one O(10), one O(12), one O(7), and two equivalent O(8) atoms. In the fifth V site, V(5) is bonded in a 6-coordinate geometry to one O(11), one O(13), one O(15), one O(5), and two equivalent O(9) atoms. In the sixth V site, V(6) is bonded in a 6-coordinate geometry to one O(10), one O(14), one O(2), one O(9), and two equivalent O(13) atoms. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Na(2) and one V(1) atom. In the second O site, O(2) is bonded to one V(2), one V(6), and two equivalent V(1) atoms to form a mixture of distorted edge and corner-sharing OV4 tetrahedra. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one V(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one V(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one V(1), one V(3), and one V(5) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one V(1) and two equivalent V(2) atoms. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one V(4) and two equivalent V(3) atoms. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one V(3) and two equivalent V(4) atoms. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one V(6) and two equivalent V(5) atoms. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one V(2), one V(4), and one V(6) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to two equivalent Na(2) and one V(5) atom. In the twelfth O site, O(12) is bonded in a 2-coordinate geometry to one Na(2) and one V(4) atom. In the thirteenth O site, O(13) is bonded to one V(1), one V(5), and two equivalent V(6) atoms to form a mixture of distorted edge and corner-sharing OV4 trigonal pyramids. In the fourteenth O site, O(14) is bonded in a linear geometry to one Na(1) and one V(6) atom. In the fifteenth O site, O(15) is bonded in a linear geometry to one V(2) and one V(5) atom. is represented by the CIF file [CIF]
data_Na2V6O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.644
_cell_length_b   8.160
_cell_length_c   10.485
_cell_angle_alpha   76.724
_cell_angle_beta   89.822
_cell_angle_gamma   77.152
_symmetry_Int_Tables_number   1
_cell_volume   295.456
_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
  Na  Na0  1  0.542  0.911  0.344  1.0
  Na  Na1  1  0.456  0.091  0.657  1.0
  V  V2  1  0.674  0.653  0.902  1.0
  V  V3  1  0.106  0.785  0.101  1.0
  V  V4  1  0.715  0.564  0.600  1.0
  V  V5  1  0.285  0.433  0.402  1.0
  V  V6  1  0.889  0.219  0.897  1.0
  V  V7  1  0.323  0.347  0.098  1.0
  O  O8  1  0.585  0.841  0.803  1.0
  O  O9  1  0.189  0.621  0.958  1.0
  O  O10  1  0.611  0.775  0.559  1.0
  O  O11  1  0.093  0.810  0.254  1.0
  O  O12  1  0.744  0.516  0.781  1.0
  O  O13  1  0.628  0.741  0.074  1.0
  O  O14  1  0.249  0.498  0.579  1.0
  O  O15  1  0.752  0.497  0.424  1.0
  O  O16  1  0.369  0.259  0.927  1.0
  O  O17  1  0.259  0.481  0.221  1.0
  O  O18  1  0.901  0.195  0.745  1.0
  O  O19  1  0.391  0.221  0.443  1.0
  O  O20  1  0.807  0.381  0.043  1.0
  O  O21  1  0.414  0.157  0.197  1.0
  O  O22  1  1.000  0.001  0.999  1.0
[/CIF]
.