The material structure described by Ni9O10 crystallizes in the triclinic P-1 space group. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the second Ni site, Ni(2) is bonded to one O(2), one O(5), two equivalent O(1), and two equivalent O(3) atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 2-9°. In the third Ni site, Ni(3) is bonded to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 3-10°. In the fourth Ni site, Ni(4) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 2-11°. In the fifth Ni site, Ni(5) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Ni(3), one Ni(4), two equivalent Ni(1), and two equivalent Ni(2) atoms to form ONi6 octahedra that share corners with two equivalent O(2)Ni6 octahedra,  a cornercorner with one O(4)Ni5 square pyramid,  a cornercorner with one O(5)Ni5 square pyramid, corners with two equivalent O(3)Ni5 square pyramids, edges with two equivalent O(1)Ni6 octahedra, edges with three equivalent O(2)Ni6 octahedra, edges with two equivalent O(4)Ni5 square pyramids, edges with two equivalent O(5)Ni5 square pyramids, and edges with three equivalent O(3)Ni5 square pyramids. The corner-sharing octahedral tilt angles range from 2-3°. In the second O site, O(2) is bonded to one Ni(2), one Ni(3), one Ni(4), one Ni(5), and two equivalent Ni(1) atoms to form ONi6 octahedra that share  a cornercorner with one O(2)Ni6 octahedra, corners with two equivalent O(1)Ni6 octahedra,  a cornercorner with one O(4)Ni5 square pyramid, corners with two equivalent O(5)Ni5 square pyramids,  an edgeedge with one O(2)Ni6 octahedra, edges with three equivalent O(1)Ni6 octahedra, edges with two equivalent O(5)Ni5 square pyramids, edges with three equivalent O(3)Ni5 square pyramids, and edges with three equivalent O(4)Ni5 square pyramids. The corner-sharing octahedral tilt angles range from 0-3°. In the third O site, O(3) is bonded to one Ni(1), one Ni(3), one Ni(4), and two equivalent Ni(2) atoms to form ONi5 square pyramids that share corners with two equivalent O(1)Ni6 octahedra, corners with three equivalent O(5)Ni5 square pyramids, corners with four equivalent O(4)Ni5 square pyramids, edges with three equivalent O(1)Ni6 octahedra, edges with three equivalent O(2)Ni6 octahedra,  an edgeedge with one O(3)Ni5 square pyramid, and  an edgeedge with one O(5)Ni5 square pyramid. The corner-sharing octahedral tilt angles range from 6-8°. In the fourth O site, O(4) is bonded to one Ni(1), one Ni(3), one Ni(5), and two equivalent Ni(4) atoms to form ONi5 square pyramids that share  a cornercorner with one O(1)Ni6 octahedra,  a cornercorner with one O(2)Ni6 octahedra,  a cornercorner with one O(4)Ni5 square pyramid, corners with two equivalent O(5)Ni5 square pyramids, corners with four equivalent O(3)Ni5 square pyramids, edges with two equivalent O(1)Ni6 octahedra, edges with three equivalent O(2)Ni6 octahedra,  an edgeedge with one O(4)Ni5 square pyramid, and edges with two equivalent O(5)Ni5 square pyramids. The corner-sharing octahedral tilt angles range from 6-8°. In the fifth O site, O(5) is bonded to one Ni(2), one Ni(4), one Ni(5), and two equivalent Ni(3) atoms to form ONi5 square pyramids that share  a cornercorner with one O(1)Ni6 octahedra, corners with two equivalent O(2)Ni6 octahedra,  a cornercorner with one O(5)Ni5 square pyramid, corners with two equivalent O(4)Ni5 square pyramids, corners with three equivalent O(3)Ni5 square pyramids, edges with two equivalent O(1)Ni6 octahedra, edges with two equivalent O(2)Ni6 octahedra,  an edgeedge with one O(3)Ni5 square pyramid,  an edgeedge with one O(5)Ni5 square pyramid, and edges with two equivalent O(4)Ni5 square pyramids. The corner-sharing octahedral tilt angles range from 3-5°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ni9O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.097
_cell_length_b   5.892
_cell_length_c   6.646
_cell_angle_alpha   102.846
_cell_angle_beta   97.899
_cell_angle_gamma   106.895
_symmetry_Int_Tables_number   1
_cell_volume   181.794
_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
  Ni  Ni0  1  0.196  0.894  0.393  1.0
  Ni  Ni1  1  0.202  0.403  0.392  1.0
  Ni  Ni2  1  0.596  0.696  0.193  1.0
  Ni  Ni3  1  0.614  0.207  0.200  1.0
  Ni  Ni4  1  0.000  0.000  0.000  1.0
  Ni  Ni5  1  0.386  0.793  0.800  1.0
  Ni  Ni6  1  0.798  0.597  0.608  1.0
  Ni  Ni7  1  0.404  0.304  0.807  1.0
  Ni  Ni8  1  0.804  0.106  0.607  1.0
  O  O9  1  0.499  0.247  0.505  1.0
  O  O10  1  0.501  0.753  0.495  1.0
  O  O11  1  0.902  0.051  0.300  1.0
  O  O12  1  0.892  0.552  0.317  1.0
  O  O13  1  0.321  0.879  0.111  1.0
  O  O14  1  0.323  0.340  0.106  1.0
  O  O15  1  0.677  0.660  0.894  1.0
  O  O16  1  0.679  0.121  0.889  1.0
  O  O17  1  0.098  0.949  0.700  1.0
  O  O18  1  0.108  0.448  0.683  1.0
[/CIF]
.
The material structure described by Ni9O10 crystallizes in the triclinic P-1 space group. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the second Ni site, Ni(2) is bonded to one O(2), one O(5), two equivalent O(1), and two equivalent O(3) atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 2-9°. In the third Ni site, Ni(3) is bonded to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 3-10°. In the fourth Ni site, Ni(4) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 2-11°. In the fifth Ni site, Ni(5) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Ni(3), one Ni(4), two equivalent Ni(1), and two equivalent Ni(2) atoms to form ONi6 octahedra that share corners with two equivalent O(2)Ni6 octahedra,  a cornercorner with one O(4)Ni5 square pyramid,  a cornercorner with one O(5)Ni5 square pyramid, corners with two equivalent O(3)Ni5 square pyramids, edges with two equivalent O(1)Ni6 octahedra, edges with three equivalent O(2)Ni6 octahedra, edges with two equivalent O(4)Ni5 square pyramids, edges with two equivalent O(5)Ni5 square pyramids, and edges with three equivalent O(3)Ni5 square pyramids. The corner-sharing octahedral tilt angles range from 2-3°. In the second O site, O(2) is bonded to one Ni(2), one Ni(3), one Ni(4), one Ni(5), and two equivalent Ni(1) atoms to form ONi6 octahedra that share  a cornercorner with one O(2)Ni6 octahedra, corners with two equivalent O(1)Ni6 octahedra,  a cornercorner with one O(4)Ni5 square pyramid, corners with two equivalent O(5)Ni5 square pyramids,  an edgeedge with one O(2)Ni6 octahedra, edges with three equivalent O(1)Ni6 octahedra, edges with two equivalent O(5)Ni5 square pyramids, edges with three equivalent O(3)Ni5 square pyramids, and edges with three equivalent O(4)Ni5 square pyramids. The corner-sharing octahedral tilt angles range from 0-3°. In the third O site, O(3) is bonded to one Ni(1), one Ni(3), one Ni(4), and two equivalent Ni(2) atoms to form ONi5 square pyramids that share corners with two equivalent O(1)Ni6 octahedra, corners with three equivalent O(5)Ni5 square pyramids, corners with four equivalent O(4)Ni5 square pyramids, edges with three equivalent O(1)Ni6 octahedra, edges with three equivalent O(2)Ni6 octahedra,  an edgeedge with one O(3)Ni5 square pyramid, and  an edgeedge with one O(5)Ni5 square pyramid. The corner-sharing octahedral tilt angles range from 6-8°. In the fourth O site, O(4) is bonded to one Ni(1), one Ni(3), one Ni(5), and two equivalent Ni(4) atoms to form ONi5 square pyramids that share  a cornercorner with one O(1)Ni6 octahedra,  a cornercorner with one O(2)Ni6 octahedra,  a cornercorner with one O(4)Ni5 square pyramid, corners with two equivalent O(5)Ni5 square pyramids, corners with four equivalent O(3)Ni5 square pyramids, edges with two equivalent O(1)Ni6 octahedra, edges with three equivalent O(2)Ni6 octahedra,  an edgeedge with one O(4)Ni5 square pyramid, and edges with two equivalent O(5)Ni5 square pyramids. The corner-sharing octahedral tilt angles range from 6-8°. In the fifth O site, O(5) is bonded to one Ni(2), one Ni(4), one Ni(5), and two equivalent Ni(3) atoms to form ONi5 square pyramids that share  a cornercorner with one O(1)Ni6 octahedra, corners with two equivalent O(2)Ni6 octahedra,  a cornercorner with one O(5)Ni5 square pyramid, corners with two equivalent O(4)Ni5 square pyramids, corners with three equivalent O(3)Ni5 square pyramids, edges with two equivalent O(1)Ni6 octahedra, edges with two equivalent O(2)Ni6 octahedra,  an edgeedge with one O(3)Ni5 square pyramid,  an edgeedge with one O(5)Ni5 square pyramid, and edges with two equivalent O(4)Ni5 square pyramids. The corner-sharing octahedral tilt angles range from 3-5°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ni9O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.097
_cell_length_b   5.892
_cell_length_c   6.646
_cell_angle_alpha   102.846
_cell_angle_beta   97.899
_cell_angle_gamma   106.895
_symmetry_Int_Tables_number   1
_cell_volume   181.794
_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
  Ni  Ni0  1  0.196  0.894  0.393  1.0
  Ni  Ni1  1  0.202  0.403  0.392  1.0
  Ni  Ni2  1  0.596  0.696  0.193  1.0
  Ni  Ni3  1  0.614  0.207  0.200  1.0
  Ni  Ni4  1  0.000  0.000  0.000  1.0
  Ni  Ni5  1  0.386  0.793  0.800  1.0
  Ni  Ni6  1  0.798  0.597  0.608  1.0
  Ni  Ni7  1  0.404  0.304  0.807  1.0
  Ni  Ni8  1  0.804  0.106  0.607  1.0
  O  O9  1  0.499  0.247  0.505  1.0
  O  O10  1  0.501  0.753  0.495  1.0
  O  O11  1  0.902  0.051  0.300  1.0
  O  O12  1  0.892  0.552  0.317  1.0
  O  O13  1  0.321  0.879  0.111  1.0
  O  O14  1  0.323  0.340  0.106  1.0
  O  O15  1  0.677  0.660  0.894  1.0
  O  O16  1  0.679  0.121  0.889  1.0
  O  O17  1  0.098  0.949  0.700  1.0
  O  O18  1  0.108  0.448  0.683  1.0
[/CIF]
.