The crystal structure described by Na6V4Mn2O15 is Pb (Zr_0.50 Ti_0.48) O_3-derived structured and crystallizes in the monoclinic P2/c space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to two equivalent O(1), two equivalent O(5), and two equivalent O(7) atoms. In the third Na site, Na(3) is bonded in a 1-coordinate geometry to one O(5), one O(7), one O(8), two equivalent O(3), and two equivalent O(4) atoms. In the fourth Na site, Na(4) is bonded in a 7-coordinate geometry to one O(2), one O(6), one O(8), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form VO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-46°. In the second V site, V(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form VO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra and  a cornercorner with one V(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 16-24°. Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form MnO6 octahedra that share corners with two equivalent V(2)O4 tetrahedra and corners with four equivalent V(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(3) is bonded to two equivalent Na(3), two equivalent Na(4), one V(1), and one Mn(1) atom to form distorted edge-sharing ONa4MnV octahedra. In the second O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Na(3), two equivalent Na(4), one V(1), and one Mn(1) atom. In the third O site, O(5) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one V(2), and one Mn(1) atom. In the fourth O site, O(6) is bonded in a distorted linear geometry to two equivalent Na(1), two equivalent Na(4), and two equivalent V(2) atoms. In the fifth O site, O(7) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one V(2), and one Mn(1) atom. In the sixth O site, O(8) is bonded in a 3-coordinate geometry to one Na(3), one Na(4), and one V(2) atom. In the seventh O site, O(1) is bonded in a 1-coordinate geometry to one Na(2), one V(1), and one Mn(1) atom. In the eighth O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(4), one V(1), and one Mn(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na6Mn2V4O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.785
_cell_length_b   7.472
_cell_length_c   17.525
_cell_angle_alpha   90.113
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   757.487
_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
  Na  Na0  1  0.730  0.500  0.250  1.0
  Na  Na1  1  0.270  0.500  0.750  1.0
  Na  Na2  1  0.749  0.000  0.250  1.0
  Na  Na3  1  0.251  0.000  0.750  1.0
  Na  Na4  1  0.234  0.998  0.422  1.0
  Na  Na5  1  0.234  0.002  0.078  1.0
  Na  Na6  1  0.766  0.002  0.578  1.0
  Na  Na7  1  0.766  0.998  0.922  1.0
  Na  Na8  1  0.211  0.459  0.418  1.0
  Na  Na9  1  0.211  0.541  0.082  1.0
  Na  Na10  1  0.789  0.541  0.582  1.0
  Na  Na11  1  0.789  0.459  0.918  1.0
  Mn  Mn12  1  0.742  0.750  0.408  1.0
  Mn  Mn13  1  0.742  0.250  0.092  1.0
  Mn  Mn14  1  0.258  0.250  0.592  1.0
  Mn  Mn15  1  0.258  0.750  0.908  1.0
  V  V16  1  0.255  0.746  0.557  1.0
  V  V17  1  0.255  0.254  0.943  1.0
  V  V18  1  0.745  0.254  0.443  1.0
  V  V19  1  0.745  0.746  0.057  1.0
  V  V20  1  0.243  0.738  0.269  1.0
  V  V21  1  0.243  0.262  0.231  1.0
  V  V22  1  0.757  0.262  0.731  1.0
  V  V23  1  0.757  0.738  0.769  1.0
  O  O24  1  0.268  0.949  0.603  1.0
  O  O25  1  0.268  0.051  0.897  1.0
  O  O26  1  0.732  0.051  0.397  1.0
  O  O27  1  0.732  0.949  0.103  1.0
  O  O28  1  0.233  0.555  0.615  1.0
  O  O29  1  0.233  0.445  0.885  1.0
  O  O30  1  0.767  0.445  0.385  1.0
  O  O31  1  0.767  0.555  0.115  1.0
  O  O32  1  0.010  0.750  0.497  1.0
  O  O33  1  0.010  0.250  0.003  1.0
  O  O34  1  0.990  0.250  0.503  1.0
  O  O35  1  0.990  0.750  0.997  1.0
  O  O36  1  0.500  0.729  0.498  1.0
  O  O37  1  0.500  0.271  0.002  1.0
  O  O38  1  0.500  0.271  0.502  1.0
  O  O39  1  0.500  0.729  0.998  1.0
  O  O40  1  0.497  0.778  0.318  1.0
  O  O41  1  0.497  0.222  0.182  1.0
  O  O42  1  0.503  0.222  0.682  1.0
  O  O43  1  0.503  0.778  0.818  1.0
  O  O44  1  0.253  0.500  0.250  1.0
  O  O45  1  0.747  0.500  0.750  1.0
  O  O46  1  0.999  0.770  0.324  1.0
  O  O47  1  0.999  0.230  0.176  1.0
  O  O48  1  0.001  0.230  0.676  1.0
  O  O49  1  0.001  0.770  0.824  1.0
  O  O50  1  0.226  0.841  0.183  1.0
  O  O51  1  0.226  0.159  0.317  1.0
  O  O52  1  0.774  0.159  0.817  1.0
  O  O53  1  0.774  0.841  0.683  1.0
[/CIF]
.
The crystal structure described by Na6V4Mn2O15 is Pb (Zr_0.50 Ti_0.48) O_3-derived structured and crystallizes in the monoclinic P2/c space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to two equivalent O(1), two equivalent O(5), and two equivalent O(7) atoms. In the third Na site, Na(3) is bonded in a 1-coordinate geometry to one O(5), one O(7), one O(8), two equivalent O(3), and two equivalent O(4) atoms. In the fourth Na site, Na(4) is bonded in a 7-coordinate geometry to one O(2), one O(6), one O(8), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form VO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-46°. In the second V site, V(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form VO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra and  a cornercorner with one V(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 16-24°. Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form MnO6 octahedra that share corners with two equivalent V(2)O4 tetrahedra and corners with four equivalent V(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(3) is bonded to two equivalent Na(3), two equivalent Na(4), one V(1), and one Mn(1) atom to form distorted edge-sharing ONa4MnV octahedra. In the second O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Na(3), two equivalent Na(4), one V(1), and one Mn(1) atom. In the third O site, O(5) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one V(2), and one Mn(1) atom. In the fourth O site, O(6) is bonded in a distorted linear geometry to two equivalent Na(1), two equivalent Na(4), and two equivalent V(2) atoms. In the fifth O site, O(7) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one V(2), and one Mn(1) atom. In the sixth O site, O(8) is bonded in a 3-coordinate geometry to one Na(3), one Na(4), and one V(2) atom. In the seventh O site, O(1) is bonded in a 1-coordinate geometry to one Na(2), one V(1), and one Mn(1) atom. In the eighth O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(4), one V(1), and one Mn(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na6Mn2V4O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.785
_cell_length_b   7.472
_cell_length_c   17.525
_cell_angle_alpha   90.113
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   757.487
_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
  Na  Na0  1  0.730  0.500  0.250  1.0
  Na  Na1  1  0.270  0.500  0.750  1.0
  Na  Na2  1  0.749  0.000  0.250  1.0
  Na  Na3  1  0.251  0.000  0.750  1.0
  Na  Na4  1  0.234  0.998  0.422  1.0
  Na  Na5  1  0.234  0.002  0.078  1.0
  Na  Na6  1  0.766  0.002  0.578  1.0
  Na  Na7  1  0.766  0.998  0.922  1.0
  Na  Na8  1  0.211  0.459  0.418  1.0
  Na  Na9  1  0.211  0.541  0.082  1.0
  Na  Na10  1  0.789  0.541  0.582  1.0
  Na  Na11  1  0.789  0.459  0.918  1.0
  Mn  Mn12  1  0.742  0.750  0.408  1.0
  Mn  Mn13  1  0.742  0.250  0.092  1.0
  Mn  Mn14  1  0.258  0.250  0.592  1.0
  Mn  Mn15  1  0.258  0.750  0.908  1.0
  V  V16  1  0.255  0.746  0.557  1.0
  V  V17  1  0.255  0.254  0.943  1.0
  V  V18  1  0.745  0.254  0.443  1.0
  V  V19  1  0.745  0.746  0.057  1.0
  V  V20  1  0.243  0.738  0.269  1.0
  V  V21  1  0.243  0.262  0.231  1.0
  V  V22  1  0.757  0.262  0.731  1.0
  V  V23  1  0.757  0.738  0.769  1.0
  O  O24  1  0.268  0.949  0.603  1.0
  O  O25  1  0.268  0.051  0.897  1.0
  O  O26  1  0.732  0.051  0.397  1.0
  O  O27  1  0.732  0.949  0.103  1.0
  O  O28  1  0.233  0.555  0.615  1.0
  O  O29  1  0.233  0.445  0.885  1.0
  O  O30  1  0.767  0.445  0.385  1.0
  O  O31  1  0.767  0.555  0.115  1.0
  O  O32  1  0.010  0.750  0.497  1.0
  O  O33  1  0.010  0.250  0.003  1.0
  O  O34  1  0.990  0.250  0.503  1.0
  O  O35  1  0.990  0.750  0.997  1.0
  O  O36  1  0.500  0.729  0.498  1.0
  O  O37  1  0.500  0.271  0.002  1.0
  O  O38  1  0.500  0.271  0.502  1.0
  O  O39  1  0.500  0.729  0.998  1.0
  O  O40  1  0.497  0.778  0.318  1.0
  O  O41  1  0.497  0.222  0.182  1.0
  O  O42  1  0.503  0.222  0.682  1.0
  O  O43  1  0.503  0.778  0.818  1.0
  O  O44  1  0.253  0.500  0.250  1.0
  O  O45  1  0.747  0.500  0.750  1.0
  O  O46  1  0.999  0.770  0.324  1.0
  O  O47  1  0.999  0.230  0.176  1.0
  O  O48  1  0.001  0.230  0.676  1.0
  O  O49  1  0.001  0.770  0.824  1.0
  O  O50  1  0.226  0.841  0.183  1.0
  O  O51  1  0.226  0.159  0.317  1.0
  O  O52  1  0.774  0.159  0.817  1.0
  O  O53  1  0.774  0.841  0.683  1.0
[/CIF]
.