The crystal structure described by NiAs2O4 crystallizes in the tetragonal P4_2/mbc space group. Ni(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing NiO6 octahedra. As(1) is bonded in a distorted T-shaped geometry to one O(2) and two equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Ni(1) and one As(1) atom. In the second O site, O(1) is bonded in a trigonal planar geometry to one Ni(1) and two equivalent As(1) atoms. is represented by the CIF card [CIF]
data_Ni(AsO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.226
_cell_length_b   8.226
_cell_length_c   5.624
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   380.562
_cell_formula_units_Z   4
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  0.500  0.000  0.250  1.0
  Ni  Ni1  1  0.000  0.500  0.750  1.0
  Ni  Ni2  1  0.500  0.000  0.750  1.0
  Ni  Ni3  1  0.000  0.500  0.250  1.0
  As  As4  1  0.170  0.183  0.000  1.0
  As  As5  1  0.183  0.830  0.500  1.0
  As  As6  1  0.830  0.817  0.000  1.0
  As  As7  1  0.817  0.170  0.500  1.0
  As  As8  1  0.330  0.683  0.000  1.0
  As  As9  1  0.670  0.317  0.000  1.0
  As  As10  1  0.683  0.670  0.500  1.0
  As  As11  1  0.317  0.330  0.500  1.0
  O  O12  1  0.319  0.181  0.250  1.0
  O  O13  1  0.181  0.681  0.750  1.0
  O  O14  1  0.681  0.819  0.250  1.0
  O  O15  1  0.819  0.319  0.750  1.0
  O  O16  1  0.681  0.819  0.750  1.0
  O  O17  1  0.819  0.319  0.250  1.0
  O  O18  1  0.319  0.181  0.750  1.0
  O  O19  1  0.181  0.681  0.250  1.0
  O  O20  1  0.637  0.108  0.000  1.0
  O  O21  1  0.108  0.363  0.500  1.0
  O  O22  1  0.363  0.892  0.000  1.0
  O  O23  1  0.892  0.637  0.500  1.0
  O  O24  1  0.863  0.608  0.000  1.0
  O  O25  1  0.137  0.392  0.000  1.0
  O  O26  1  0.608  0.137  0.500  1.0
  O  O27  1  0.392  0.863  0.500  1.0
[/CIF]
.
The crystal structure described by NiAs2O4 crystallizes in the tetragonal P4_2/mbc space group. Ni(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing NiO6 octahedra. As(1) is bonded in a distorted T-shaped geometry to one O(2) and two equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Ni(1) and one As(1) atom. In the second O site, O(1) is bonded in a trigonal planar geometry to one Ni(1) and two equivalent As(1) atoms. is represented by the CIF card [CIF]
data_Ni(AsO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.226
_cell_length_b   8.226
_cell_length_c   5.624
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   380.562
_cell_formula_units_Z   4
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  0.500  0.000  0.250  1.0
  Ni  Ni1  1  0.000  0.500  0.750  1.0
  Ni  Ni2  1  0.500  0.000  0.750  1.0
  Ni  Ni3  1  0.000  0.500  0.250  1.0
  As  As4  1  0.170  0.183  0.000  1.0
  As  As5  1  0.183  0.830  0.500  1.0
  As  As6  1  0.830  0.817  0.000  1.0
  As  As7  1  0.817  0.170  0.500  1.0
  As  As8  1  0.330  0.683  0.000  1.0
  As  As9  1  0.670  0.317  0.000  1.0
  As  As10  1  0.683  0.670  0.500  1.0
  As  As11  1  0.317  0.330  0.500  1.0
  O  O12  1  0.319  0.181  0.250  1.0
  O  O13  1  0.181  0.681  0.750  1.0
  O  O14  1  0.681  0.819  0.250  1.0
  O  O15  1  0.819  0.319  0.750  1.0
  O  O16  1  0.681  0.819  0.750  1.0
  O  O17  1  0.819  0.319  0.250  1.0
  O  O18  1  0.319  0.181  0.750  1.0
  O  O19  1  0.181  0.681  0.250  1.0
  O  O20  1  0.637  0.108  0.000  1.0
  O  O21  1  0.108  0.363  0.500  1.0
  O  O22  1  0.363  0.892  0.000  1.0
  O  O23  1  0.892  0.637  0.500  1.0
  O  O24  1  0.863  0.608  0.000  1.0
  O  O25  1  0.137  0.392  0.000  1.0
  O  O26  1  0.608  0.137  0.500  1.0
  O  O27  1  0.392  0.863  0.500  1.0
[/CIF]
.