The structure described by V10O9 crystallizes in the triclinic P-1 space group. There are five inequivalent V sites. In the first V site, V(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form VO6 octahedra that share  a cornercorner with one V(1)O6 octahedra, corners with two equivalent V(5)O6 octahedra,  a cornercorner with one V(4)O5 square pyramid, corners with two equivalent V(2)O5 square pyramids,  an edgeedge with one V(1)O6 octahedra, edges with three equivalent V(5)O6 octahedra, edges with two equivalent V(2)O5 square pyramids, edges with three equivalent V(3)O5 square pyramids, and edges with three equivalent V(4)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-2°. In the second V site, V(2) is bonded to one O(3), one O(4), one O(5), and two equivalent O(2) atoms to form VO5 square pyramids that share  a cornercorner with one V(5)O6 octahedra, corners with two equivalent V(1)O6 octahedra,  a cornercorner with one V(2)O5 square pyramid, corners with two equivalent V(4)O5 square pyramids, corners with three equivalent V(3)O5 square pyramids, edges with two equivalent V(1)O6 octahedra, edges with two equivalent V(5)O6 octahedra,  an edgeedge with one V(2)O5 square pyramid,  an edgeedge with one V(3)O5 square pyramid, and edges with two equivalent V(4)O5 square pyramids. The corner-sharing octahedral tilt angles range from 2-6°. In the third V site, V(3) is bonded to one O(1), one O(2), one O(4), and two equivalent O(3) atoms to form VO5 square pyramids that share corners with two equivalent V(5)O6 octahedra, corners with three equivalent V(2)O5 square pyramids, corners with four equivalent V(4)O5 square pyramids, edges with three equivalent V(1)O6 octahedra, edges with three equivalent V(5)O6 octahedra,  an edgeedge with one V(2)O5 square pyramid, and  an edgeedge with one V(3)O5 square pyramid. The corner-sharing octahedral tilt angles range from 1-6°. In the fourth V site, V(4) is bonded to one O(1), one O(2), one O(5), and two equivalent O(4) atoms to form VO5 square pyramids that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(5)O6 octahedra,  a cornercorner with one V(4)O5 square pyramid, corners with two equivalent V(2)O5 square pyramids, corners with four equivalent V(3)O5 square pyramids, edges with two equivalent V(5)O6 octahedra, edges with three equivalent V(1)O6 octahedra,  an edgeedge with one V(4)O5 square pyramid, and edges with two equivalent V(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 2-5°. In the fifth V site, V(5) is bonded to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra,  a cornercorner with one V(2)O5 square pyramid,  a cornercorner with one V(4)O5 square pyramid, corners with two equivalent V(3)O5 square pyramids, edges with two equivalent V(5)O6 octahedra, edges with three equivalent V(1)O6 octahedra, edges with two equivalent V(2)O5 square pyramids, edges with two equivalent V(4)O5 square pyramids, and edges with three equivalent V(3)O5 square pyramids. The corner-sharing octahedral tilt angles are 2°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one V(3), one V(4), two equivalent V(1), and two equivalent V(5) atoms to form a mixture of corner and edge-sharing OV6 octahedra. The corner-sharing octahedral tilt angles range from 2-6°. In the second O site, O(2) is bonded to one V(1), one V(3), one V(4), one V(5), and two equivalent V(2) atoms to form a mixture of corner and edge-sharing OV6 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the third O site, O(3) is bonded to one V(1), one V(2), two equivalent V(3), and two equivalent V(5) atoms to form a mixture of corner and edge-sharing OV6 octahedra. The corner-sharing octahedral tilt angles range from 2-5°. In the fourth O site, O(4) is bonded to one V(1), one V(2), one V(3), one V(5), and two equivalent V(4) atoms to form a mixture of corner and edge-sharing OV6 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the fifth O site, O(5) is bonded to two equivalent V(1), two equivalent V(2), and two equivalent V(4) atoms to form a mixture of corner and edge-sharing OV6 octahedra. The corner-sharing octahedral tilt angles range from 2-6°. is represented by the CIF card [CIF]
data_V10O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.317
_cell_length_b   6.244
_cell_length_c   6.937
_cell_angle_alpha   103.219
_cell_angle_beta   97.237
_cell_angle_gamma   106.790
_symmetry_Int_Tables_number   1
_cell_volume   210.056
_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
  V  V0  1  0.893  0.551  0.802  1.0
  V  V1  1  0.107  0.449  0.198  1.0
  V  V2  1  0.710  0.140  0.396  1.0
  V  V3  1  0.290  0.860  0.604  1.0
  V  V4  1  0.904  0.047  0.788  1.0
  V  V5  1  0.096  0.953  0.212  1.0
  V  V6  1  0.716  0.663  0.408  1.0
  V  V7  1  0.284  0.337  0.592  1.0
  V  V8  1  0.498  0.749  0.998  1.0
  V  V9  1  0.502  0.251  0.002  1.0
  O  O10  1  0.800  0.601  0.103  1.0
  O  O11  1  0.200  0.399  0.897  1.0
  O  O12  1  0.603  0.198  0.693  1.0
  O  O13  1  0.397  0.802  0.307  1.0
  O  O14  1  0.806  0.098  0.092  1.0
  O  O15  1  0.194  0.902  0.908  1.0
  O  O16  1  0.589  0.697  0.696  1.0
  O  O17  1  0.411  0.303  0.304  1.0
  O  O18  1  0.000  0.500  0.500  1.0
[/CIF]
.
The structure described by V10O9 crystallizes in the triclinic P-1 space group. There are five inequivalent V sites. In the first V site, V(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form VO6 octahedra that share  a cornercorner with one V(1)O6 octahedra, corners with two equivalent V(5)O6 octahedra,  a cornercorner with one V(4)O5 square pyramid, corners with two equivalent V(2)O5 square pyramids,  an edgeedge with one V(1)O6 octahedra, edges with three equivalent V(5)O6 octahedra, edges with two equivalent V(2)O5 square pyramids, edges with three equivalent V(3)O5 square pyramids, and edges with three equivalent V(4)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-2°. In the second V site, V(2) is bonded to one O(3), one O(4), one O(5), and two equivalent O(2) atoms to form VO5 square pyramids that share  a cornercorner with one V(5)O6 octahedra, corners with two equivalent V(1)O6 octahedra,  a cornercorner with one V(2)O5 square pyramid, corners with two equivalent V(4)O5 square pyramids, corners with three equivalent V(3)O5 square pyramids, edges with two equivalent V(1)O6 octahedra, edges with two equivalent V(5)O6 octahedra,  an edgeedge with one V(2)O5 square pyramid,  an edgeedge with one V(3)O5 square pyramid, and edges with two equivalent V(4)O5 square pyramids. The corner-sharing octahedral tilt angles range from 2-6°. In the third V site, V(3) is bonded to one O(1), one O(2), one O(4), and two equivalent O(3) atoms to form VO5 square pyramids that share corners with two equivalent V(5)O6 octahedra, corners with three equivalent V(2)O5 square pyramids, corners with four equivalent V(4)O5 square pyramids, edges with three equivalent V(1)O6 octahedra, edges with three equivalent V(5)O6 octahedra,  an edgeedge with one V(2)O5 square pyramid, and  an edgeedge with one V(3)O5 square pyramid. The corner-sharing octahedral tilt angles range from 1-6°. In the fourth V site, V(4) is bonded to one O(1), one O(2), one O(5), and two equivalent O(4) atoms to form VO5 square pyramids that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(5)O6 octahedra,  a cornercorner with one V(4)O5 square pyramid, corners with two equivalent V(2)O5 square pyramids, corners with four equivalent V(3)O5 square pyramids, edges with two equivalent V(5)O6 octahedra, edges with three equivalent V(1)O6 octahedra,  an edgeedge with one V(4)O5 square pyramid, and edges with two equivalent V(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 2-5°. In the fifth V site, V(5) is bonded to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra,  a cornercorner with one V(2)O5 square pyramid,  a cornercorner with one V(4)O5 square pyramid, corners with two equivalent V(3)O5 square pyramids, edges with two equivalent V(5)O6 octahedra, edges with three equivalent V(1)O6 octahedra, edges with two equivalent V(2)O5 square pyramids, edges with two equivalent V(4)O5 square pyramids, and edges with three equivalent V(3)O5 square pyramids. The corner-sharing octahedral tilt angles are 2°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one V(3), one V(4), two equivalent V(1), and two equivalent V(5) atoms to form a mixture of corner and edge-sharing OV6 octahedra. The corner-sharing octahedral tilt angles range from 2-6°. In the second O site, O(2) is bonded to one V(1), one V(3), one V(4), one V(5), and two equivalent V(2) atoms to form a mixture of corner and edge-sharing OV6 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the third O site, O(3) is bonded to one V(1), one V(2), two equivalent V(3), and two equivalent V(5) atoms to form a mixture of corner and edge-sharing OV6 octahedra. The corner-sharing octahedral tilt angles range from 2-5°. In the fourth O site, O(4) is bonded to one V(1), one V(2), one V(3), one V(5), and two equivalent V(4) atoms to form a mixture of corner and edge-sharing OV6 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the fifth O site, O(5) is bonded to two equivalent V(1), two equivalent V(2), and two equivalent V(4) atoms to form a mixture of corner and edge-sharing OV6 octahedra. The corner-sharing octahedral tilt angles range from 2-6°. is represented by the CIF card [CIF]
data_V10O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.317
_cell_length_b   6.244
_cell_length_c   6.937
_cell_angle_alpha   103.219
_cell_angle_beta   97.237
_cell_angle_gamma   106.790
_symmetry_Int_Tables_number   1
_cell_volume   210.056
_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
  V  V0  1  0.893  0.551  0.802  1.0
  V  V1  1  0.107  0.449  0.198  1.0
  V  V2  1  0.710  0.140  0.396  1.0
  V  V3  1  0.290  0.860  0.604  1.0
  V  V4  1  0.904  0.047  0.788  1.0
  V  V5  1  0.096  0.953  0.212  1.0
  V  V6  1  0.716  0.663  0.408  1.0
  V  V7  1  0.284  0.337  0.592  1.0
  V  V8  1  0.498  0.749  0.998  1.0
  V  V9  1  0.502  0.251  0.002  1.0
  O  O10  1  0.800  0.601  0.103  1.0
  O  O11  1  0.200  0.399  0.897  1.0
  O  O12  1  0.603  0.198  0.693  1.0
  O  O13  1  0.397  0.802  0.307  1.0
  O  O14  1  0.806  0.098  0.092  1.0
  O  O15  1  0.194  0.902  0.908  1.0
  O  O16  1  0.589  0.697  0.696  1.0
  O  O17  1  0.411  0.303  0.304  1.0
  O  O18  1  0.000  0.500  0.500  1.0
[/CIF]
.