The crystal structure described by V8Ni2O15 is Ilmenite-like structured and crystallizes in the monoclinic C2/c space group. There are four inequivalent V sites. In the first V site, V(1) is bonded to one O(2), one O(3), one O(6), one O(8), and two equivalent O(1) atoms to form VO6 octahedra that share  a cornercorner with one V(4)O6 octahedra, corners with three equivalent V(3)O6 octahedra, corners with five equivalent V(2)O6 octahedra,  an edgeedge with one V(1)O6 octahedra, edges with two equivalent Ni(1)O6 octahedra, and  a faceface with one V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-59°. In the second V site, V(2) is bonded to one O(3), one O(6), two equivalent O(1), and two equivalent O(2) atoms to form VO6 octahedra that share corners with four equivalent Ni(1)O6 octahedra, corners with five equivalent V(1)O6 octahedra,  an edgeedge with one V(3)O6 octahedra, edges with two equivalent V(2)O6 octahedra, and  a faceface with one V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-59°. In the third V site, V(3) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form VO6 octahedra that share  a cornercorner with one V(3)O6 octahedra, corners with two equivalent Ni(1)O6 octahedra, corners with three equivalent V(1)O6 octahedra, corners with three equivalent V(4)O6 octahedra,  an edgeedge with one V(2)O6 octahedra, edges with two equivalent V(4)O6 octahedra, and  a faceface with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-63°. In the fourth V site, V(4) is bonded to one O(5), one O(8), two equivalent O(4), and two equivalent O(7) atoms to form VO6 octahedra that share  a cornercorner with one V(1)O6 octahedra, corners with two equivalent V(4)O6 octahedra, corners with three equivalent V(3)O6 octahedra, corners with three equivalent Ni(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, edges with two equivalent V(3)O6 octahedra, and  a faceface with one V(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-58°. Ni(1) is bonded to one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form distorted NiO6 octahedra that share corners with two equivalent V(3)O6 octahedra, corners with three equivalent V(4)O6 octahedra, corners with four equivalent V(2)O6 octahedra,  an edgeedge with one V(4)O6 octahedra, edges with two equivalent V(1)O6 octahedra, and  a faceface with one V(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-63°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent V(1) and two equivalent V(2) atoms to form distorted OV4 trigonal pyramids that share corners with two equivalent O(6)V3Ni trigonal pyramids, corners with two equivalent O(8)V3Ni trigonal pyramids, corners with four equivalent O(3)V3Ni trigonal pyramids,  an edgeedge with one O(6)V3Ni trigonal pyramid, and edges with two equivalent O(1)V4 trigonal pyramids. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one V(1), two equivalent V(2), and one Ni(1) atom. In the third O site, O(3) is bonded to one V(1), one V(2), one V(3), and one Ni(1) atom to form distorted OV3Ni trigonal pyramids that share  a cornercorner with one O(8)V3Ni trigonal pyramid,  a cornercorner with one O(5)V4 trigonal pyramid, corners with two equivalent O(4)V3Ni trigonal pyramids, corners with four equivalent O(1)V4 trigonal pyramids,  an edgeedge with one O(7)V3Ni trigonal pyramid,  an edgeedge with one O(8)V3Ni trigonal pyramid, and edges with two equivalent O(6)V3Ni trigonal pyramids. In the fourth O site, O(4) is bonded to one V(3), two equivalent V(4), and one Ni(1) atom to form distorted OV3Ni trigonal pyramids that share  a cornercorner with one O(5)V4 trigonal pyramid, corners with two equivalent O(3)V3Ni trigonal pyramids, corners with two equivalent O(6)V3Ni trigonal pyramids, corners with two equivalent O(7)V3Ni trigonal pyramids, corners with four equivalent O(8)V3Ni trigonal pyramids,  an edgeedge with one O(4)V3Ni trigonal pyramid,  an edgeedge with one O(5)V4 trigonal pyramid, and edges with two equivalent O(7)V3Ni trigonal pyramids. In the fifth O site, O(5) is bonded to two equivalent V(3) and two equivalent V(4) atoms to form a mixture of distorted corner and edge-sharing OV4 trigonal pyramids. In the sixth O site, O(6) is bonded to one V(1), one V(2), one V(3), and one Ni(1) atom to form distorted OV3Ni trigonal pyramids that share  a cornercorner with one O(5)V4 trigonal pyramid, corners with two equivalent O(4)V3Ni trigonal pyramids, corners with two equivalent O(7)V3Ni trigonal pyramids, corners with two equivalent O(1)V4 trigonal pyramids, corners with three equivalent O(8)V3Ni trigonal pyramids,  an edgeedge with one O(1)V4 trigonal pyramid, and edges with two equivalent O(3)V3Ni trigonal pyramids. In the seventh O site, O(7) is bonded to one V(3), two equivalent V(4), and one Ni(1) atom to form distorted OV3Ni trigonal pyramids that share corners with two equivalent O(4)V3Ni trigonal pyramids, corners with two equivalent O(6)V3Ni trigonal pyramids, corners with two equivalent O(7)V3Ni trigonal pyramids, corners with two equivalent O(8)V3Ni trigonal pyramids, corners with three equivalent O(5)V4 trigonal pyramids,  an edgeedge with one O(3)V3Ni trigonal pyramid,  an edgeedge with one O(8)V3Ni trigonal pyramid, and edges with two equivalent O(4)V3Ni trigonal pyramids. In the eighth O site, O(8) is bonded to one V(1), one V(3), one V(4), and one Ni(1) atom to form distorted OV3Ni trigonal pyramids that share  a cornercorner with one O(3)V3Ni trigonal pyramid, corners with two equivalent O(7)V3Ni trigonal pyramids, corners with two equivalent O(1)V4 trigonal pyramids, corners with three equivalent O(6)V3Ni trigonal pyramids, corners with four equivalent O(4)V3Ni trigonal pyramids,  an edgeedge with one O(3)V3Ni trigonal pyramid,  an edgeedge with one O(7)V3Ni trigonal pyramid, and  an edgeedge with one O(5)V4 trigonal pyramid. is represented by the CIF card [CIF]
data_V8Ni2O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.520
_cell_length_b   5.520
_cell_length_c   21.026
_cell_angle_alpha   86.273
_cell_angle_beta   86.273
_cell_angle_gamma   54.995
_symmetry_Int_Tables_number   1
_cell_volume   523.390
_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
  V  V0  1  0.493  0.991  0.928  1.0
  V  V1  1  0.223  0.699  0.972  1.0
  V  V2  1  0.810  0.314  0.169  1.0
  V  V3  1  0.777  0.301  0.028  1.0
  V  V4  1  0.686  0.190  0.331  1.0
  V  V5  1  0.507  0.009  0.072  1.0
  V  V6  1  0.393  0.886  0.231  1.0
  V  V7  1  0.301  0.777  0.528  1.0
  V  V8  1  0.114  0.607  0.269  1.0
  V  V9  1  0.009  0.507  0.572  1.0
  V  V10  1  0.991  0.493  0.428  1.0
  V  V11  1  0.886  0.393  0.731  1.0
  V  V12  1  0.699  0.223  0.472  1.0
  V  V13  1  0.607  0.114  0.769  1.0
  V  V14  1  0.314  0.810  0.669  1.0
  V  V15  1  0.190  0.686  0.831  1.0
  Ni  Ni16  1  0.088  0.599  0.130  1.0
  Ni  Ni17  1  0.401  0.912  0.370  1.0
  Ni  Ni18  1  0.599  0.088  0.630  1.0
  Ni  Ni19  1  0.912  0.401  0.870  1.0
  O  O20  1  0.778  0.967  0.988  1.0
  O  O21  1  0.338  0.458  0.048  1.0
  O  O22  1  0.240  0.431  0.912  1.0
  O  O23  1  0.760  0.569  0.088  1.0
  O  O24  1  0.662  0.542  0.952  1.0
  O  O25  1  0.377  0.570  0.190  1.0
  O  O26  1  0.222  0.033  0.012  1.0
  O  O27  1  0.944  0.056  0.250  1.0
  O  O28  1  0.823  0.040  0.108  1.0
  O  O29  1  0.362  0.170  0.285  1.0
  O  O30  1  0.259  0.129  0.152  1.0
  O  O31  1  0.960  0.177  0.392  1.0
  O  O32  1  0.830  0.638  0.215  1.0
  O  O33  1  0.542  0.662  0.452  1.0
  O  O34  1  0.430  0.623  0.310  1.0
  O  O35  1  0.967  0.778  0.488  1.0
  O  O36  1  0.871  0.741  0.348  1.0
  O  O37  1  0.569  0.760  0.588  1.0
  O  O38  1  0.431  0.240  0.412  1.0
  O  O39  1  0.129  0.259  0.652  1.0
  O  O40  1  0.033  0.222  0.512  1.0
  O  O41  1  0.570  0.377  0.690  1.0
  O  O42  1  0.458  0.338  0.548  1.0
  O  O43  1  0.170  0.362  0.785  1.0
  O  O44  1  0.040  0.823  0.608  1.0
  O  O45  1  0.741  0.871  0.848  1.0
  O  O46  1  0.638  0.830  0.715  1.0
  O  O47  1  0.177  0.960  0.892  1.0
  O  O48  1  0.056  0.944  0.750  1.0
  O  O49  1  0.623  0.430  0.810  1.0
[/CIF]
.
The crystal structure described by V8Ni2O15 is Ilmenite-like structured and crystallizes in the monoclinic C2/c space group. There are four inequivalent V sites. In the first V site, V(1) is bonded to one O(2), one O(3), one O(6), one O(8), and two equivalent O(1) atoms to form VO6 octahedra that share  a cornercorner with one V(4)O6 octahedra, corners with three equivalent V(3)O6 octahedra, corners with five equivalent V(2)O6 octahedra,  an edgeedge with one V(1)O6 octahedra, edges with two equivalent Ni(1)O6 octahedra, and  a faceface with one V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-59°. In the second V site, V(2) is bonded to one O(3), one O(6), two equivalent O(1), and two equivalent O(2) atoms to form VO6 octahedra that share corners with four equivalent Ni(1)O6 octahedra, corners with five equivalent V(1)O6 octahedra,  an edgeedge with one V(3)O6 octahedra, edges with two equivalent V(2)O6 octahedra, and  a faceface with one V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-59°. In the third V site, V(3) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form VO6 octahedra that share  a cornercorner with one V(3)O6 octahedra, corners with two equivalent Ni(1)O6 octahedra, corners with three equivalent V(1)O6 octahedra, corners with three equivalent V(4)O6 octahedra,  an edgeedge with one V(2)O6 octahedra, edges with two equivalent V(4)O6 octahedra, and  a faceface with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-63°. In the fourth V site, V(4) is bonded to one O(5), one O(8), two equivalent O(4), and two equivalent O(7) atoms to form VO6 octahedra that share  a cornercorner with one V(1)O6 octahedra, corners with two equivalent V(4)O6 octahedra, corners with three equivalent V(3)O6 octahedra, corners with three equivalent Ni(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, edges with two equivalent V(3)O6 octahedra, and  a faceface with one V(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-58°. Ni(1) is bonded to one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form distorted NiO6 octahedra that share corners with two equivalent V(3)O6 octahedra, corners with three equivalent V(4)O6 octahedra, corners with four equivalent V(2)O6 octahedra,  an edgeedge with one V(4)O6 octahedra, edges with two equivalent V(1)O6 octahedra, and  a faceface with one V(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-63°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent V(1) and two equivalent V(2) atoms to form distorted OV4 trigonal pyramids that share corners with two equivalent O(6)V3Ni trigonal pyramids, corners with two equivalent O(8)V3Ni trigonal pyramids, corners with four equivalent O(3)V3Ni trigonal pyramids,  an edgeedge with one O(6)V3Ni trigonal pyramid, and edges with two equivalent O(1)V4 trigonal pyramids. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one V(1), two equivalent V(2), and one Ni(1) atom. In the third O site, O(3) is bonded to one V(1), one V(2), one V(3), and one Ni(1) atom to form distorted OV3Ni trigonal pyramids that share  a cornercorner with one O(8)V3Ni trigonal pyramid,  a cornercorner with one O(5)V4 trigonal pyramid, corners with two equivalent O(4)V3Ni trigonal pyramids, corners with four equivalent O(1)V4 trigonal pyramids,  an edgeedge with one O(7)V3Ni trigonal pyramid,  an edgeedge with one O(8)V3Ni trigonal pyramid, and edges with two equivalent O(6)V3Ni trigonal pyramids. In the fourth O site, O(4) is bonded to one V(3), two equivalent V(4), and one Ni(1) atom to form distorted OV3Ni trigonal pyramids that share  a cornercorner with one O(5)V4 trigonal pyramid, corners with two equivalent O(3)V3Ni trigonal pyramids, corners with two equivalent O(6)V3Ni trigonal pyramids, corners with two equivalent O(7)V3Ni trigonal pyramids, corners with four equivalent O(8)V3Ni trigonal pyramids,  an edgeedge with one O(4)V3Ni trigonal pyramid,  an edgeedge with one O(5)V4 trigonal pyramid, and edges with two equivalent O(7)V3Ni trigonal pyramids. In the fifth O site, O(5) is bonded to two equivalent V(3) and two equivalent V(4) atoms to form a mixture of distorted corner and edge-sharing OV4 trigonal pyramids. In the sixth O site, O(6) is bonded to one V(1), one V(2), one V(3), and one Ni(1) atom to form distorted OV3Ni trigonal pyramids that share  a cornercorner with one O(5)V4 trigonal pyramid, corners with two equivalent O(4)V3Ni trigonal pyramids, corners with two equivalent O(7)V3Ni trigonal pyramids, corners with two equivalent O(1)V4 trigonal pyramids, corners with three equivalent O(8)V3Ni trigonal pyramids,  an edgeedge with one O(1)V4 trigonal pyramid, and edges with two equivalent O(3)V3Ni trigonal pyramids. In the seventh O site, O(7) is bonded to one V(3), two equivalent V(4), and one Ni(1) atom to form distorted OV3Ni trigonal pyramids that share corners with two equivalent O(4)V3Ni trigonal pyramids, corners with two equivalent O(6)V3Ni trigonal pyramids, corners with two equivalent O(7)V3Ni trigonal pyramids, corners with two equivalent O(8)V3Ni trigonal pyramids, corners with three equivalent O(5)V4 trigonal pyramids,  an edgeedge with one O(3)V3Ni trigonal pyramid,  an edgeedge with one O(8)V3Ni trigonal pyramid, and edges with two equivalent O(4)V3Ni trigonal pyramids. In the eighth O site, O(8) is bonded to one V(1), one V(3), one V(4), and one Ni(1) atom to form distorted OV3Ni trigonal pyramids that share  a cornercorner with one O(3)V3Ni trigonal pyramid, corners with two equivalent O(7)V3Ni trigonal pyramids, corners with two equivalent O(1)V4 trigonal pyramids, corners with three equivalent O(6)V3Ni trigonal pyramids, corners with four equivalent O(4)V3Ni trigonal pyramids,  an edgeedge with one O(3)V3Ni trigonal pyramid,  an edgeedge with one O(7)V3Ni trigonal pyramid, and  an edgeedge with one O(5)V4 trigonal pyramid. is represented by the CIF card [CIF]
data_V8Ni2O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.520
_cell_length_b   5.520
_cell_length_c   21.026
_cell_angle_alpha   86.273
_cell_angle_beta   86.273
_cell_angle_gamma   54.995
_symmetry_Int_Tables_number   1
_cell_volume   523.390
_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
  V  V0  1  0.493  0.991  0.928  1.0
  V  V1  1  0.223  0.699  0.972  1.0
  V  V2  1  0.810  0.314  0.169  1.0
  V  V3  1  0.777  0.301  0.028  1.0
  V  V4  1  0.686  0.190  0.331  1.0
  V  V5  1  0.507  0.009  0.072  1.0
  V  V6  1  0.393  0.886  0.231  1.0
  V  V7  1  0.301  0.777  0.528  1.0
  V  V8  1  0.114  0.607  0.269  1.0
  V  V9  1  0.009  0.507  0.572  1.0
  V  V10  1  0.991  0.493  0.428  1.0
  V  V11  1  0.886  0.393  0.731  1.0
  V  V12  1  0.699  0.223  0.472  1.0
  V  V13  1  0.607  0.114  0.769  1.0
  V  V14  1  0.314  0.810  0.669  1.0
  V  V15  1  0.190  0.686  0.831  1.0
  Ni  Ni16  1  0.088  0.599  0.130  1.0
  Ni  Ni17  1  0.401  0.912  0.370  1.0
  Ni  Ni18  1  0.599  0.088  0.630  1.0
  Ni  Ni19  1  0.912  0.401  0.870  1.0
  O  O20  1  0.778  0.967  0.988  1.0
  O  O21  1  0.338  0.458  0.048  1.0
  O  O22  1  0.240  0.431  0.912  1.0
  O  O23  1  0.760  0.569  0.088  1.0
  O  O24  1  0.662  0.542  0.952  1.0
  O  O25  1  0.377  0.570  0.190  1.0
  O  O26  1  0.222  0.033  0.012  1.0
  O  O27  1  0.944  0.056  0.250  1.0
  O  O28  1  0.823  0.040  0.108  1.0
  O  O29  1  0.362  0.170  0.285  1.0
  O  O30  1  0.259  0.129  0.152  1.0
  O  O31  1  0.960  0.177  0.392  1.0
  O  O32  1  0.830  0.638  0.215  1.0
  O  O33  1  0.542  0.662  0.452  1.0
  O  O34  1  0.430  0.623  0.310  1.0
  O  O35  1  0.967  0.778  0.488  1.0
  O  O36  1  0.871  0.741  0.348  1.0
  O  O37  1  0.569  0.760  0.588  1.0
  O  O38  1  0.431  0.240  0.412  1.0
  O  O39  1  0.129  0.259  0.652  1.0
  O  O40  1  0.033  0.222  0.512  1.0
  O  O41  1  0.570  0.377  0.690  1.0
  O  O42  1  0.458  0.338  0.548  1.0
  O  O43  1  0.170  0.362  0.785  1.0
  O  O44  1  0.040  0.823  0.608  1.0
  O  O45  1  0.741  0.871  0.848  1.0
  O  O46  1  0.638  0.830  0.715  1.0
  O  O47  1  0.177  0.960  0.892  1.0
  O  O48  1  0.056  0.944  0.750  1.0
  O  O49  1  0.623  0.430  0.810  1.0
[/CIF]
.