The compound described by V2Ni(PO4)3 crystallizes in the trigonal R-3c space group. V(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form VO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra and  a faceface with one Ni(1)O6 octahedra. Ni(1) is bonded to six equivalent O(2) atoms to form distorted NiO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra and faces with two equivalent V(1)O6 octahedra. P(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra and corners with four equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-48°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one V(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one V(1), one Ni(1), and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_V2Ni(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.474
_cell_length_b   8.474
_cell_length_c   8.474
_cell_angle_alpha   61.101
_cell_angle_beta   61.101
_cell_angle_gamma   61.101
_symmetry_Int_Tables_number   1
_cell_volume   441.014
_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  0.142  0.142  0.142  1.0
  V  V1  1  0.358  0.358  0.358  1.0
  V  V2  1  0.642  0.642  0.642  1.0
  V  V3  1  0.858  0.858  0.858  1.0
  Ni  Ni4  1  0.000  0.000  0.000  1.0
  Ni  Ni5  1  0.500  0.500  0.500  1.0
  P  P6  1  0.044  0.750  0.456  1.0
  P  P7  1  0.456  0.044  0.750  1.0
  P  P8  1  0.750  0.456  0.044  1.0
  P  P9  1  0.250  0.544  0.956  1.0
  P  P10  1  0.544  0.956  0.250  1.0
  P  P11  1  0.956  0.250  0.544  1.0
  O  O12  1  0.115  0.316  0.504  1.0
  O  O13  1  0.316  0.504  0.115  1.0
  O  O14  1  0.059  0.910  0.258  1.0
  O  O15  1  0.504  0.115  0.316  1.0
  O  O16  1  0.004  0.816  0.615  1.0
  O  O17  1  0.242  0.590  0.441  1.0
  O  O18  1  0.258  0.059  0.910  1.0
  O  O19  1  0.441  0.242  0.590  1.0
  O  O20  1  0.184  0.385  0.996  1.0
  O  O21  1  0.590  0.441  0.242  1.0
  O  O22  1  0.090  0.742  0.941  1.0
  O  O23  1  0.385  0.996  0.184  1.0
  O  O24  1  0.615  0.004  0.816  1.0
  O  O25  1  0.910  0.258  0.059  1.0
  O  O26  1  0.410  0.559  0.758  1.0
  O  O27  1  0.816  0.615  0.004  1.0
  O  O28  1  0.559  0.758  0.410  1.0
  O  O29  1  0.742  0.941  0.090  1.0
  O  O30  1  0.758  0.410  0.559  1.0
  O  O31  1  0.996  0.184  0.385  1.0
  O  O32  1  0.496  0.885  0.684  1.0
  O  O33  1  0.941  0.090  0.742  1.0
  O  O34  1  0.684  0.496  0.885  1.0
  O  O35  1  0.885  0.684  0.496  1.0
[/CIF]
.
The compound described by V2Ni(PO4)3 crystallizes in the trigonal R-3c space group. V(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form VO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra and  a faceface with one Ni(1)O6 octahedra. Ni(1) is bonded to six equivalent O(2) atoms to form distorted NiO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra and faces with two equivalent V(1)O6 octahedra. P(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra and corners with four equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-48°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one V(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one V(1), one Ni(1), and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_V2Ni(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.474
_cell_length_b   8.474
_cell_length_c   8.474
_cell_angle_alpha   61.101
_cell_angle_beta   61.101
_cell_angle_gamma   61.101
_symmetry_Int_Tables_number   1
_cell_volume   441.014
_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  0.142  0.142  0.142  1.0
  V  V1  1  0.358  0.358  0.358  1.0
  V  V2  1  0.642  0.642  0.642  1.0
  V  V3  1  0.858  0.858  0.858  1.0
  Ni  Ni4  1  0.000  0.000  0.000  1.0
  Ni  Ni5  1  0.500  0.500  0.500  1.0
  P  P6  1  0.044  0.750  0.456  1.0
  P  P7  1  0.456  0.044  0.750  1.0
  P  P8  1  0.750  0.456  0.044  1.0
  P  P9  1  0.250  0.544  0.956  1.0
  P  P10  1  0.544  0.956  0.250  1.0
  P  P11  1  0.956  0.250  0.544  1.0
  O  O12  1  0.115  0.316  0.504  1.0
  O  O13  1  0.316  0.504  0.115  1.0
  O  O14  1  0.059  0.910  0.258  1.0
  O  O15  1  0.504  0.115  0.316  1.0
  O  O16  1  0.004  0.816  0.615  1.0
  O  O17  1  0.242  0.590  0.441  1.0
  O  O18  1  0.258  0.059  0.910  1.0
  O  O19  1  0.441  0.242  0.590  1.0
  O  O20  1  0.184  0.385  0.996  1.0
  O  O21  1  0.590  0.441  0.242  1.0
  O  O22  1  0.090  0.742  0.941  1.0
  O  O23  1  0.385  0.996  0.184  1.0
  O  O24  1  0.615  0.004  0.816  1.0
  O  O25  1  0.910  0.258  0.059  1.0
  O  O26  1  0.410  0.559  0.758  1.0
  O  O27  1  0.816  0.615  0.004  1.0
  O  O28  1  0.559  0.758  0.410  1.0
  O  O29  1  0.742  0.941  0.090  1.0
  O  O30  1  0.758  0.410  0.559  1.0
  O  O31  1  0.996  0.184  0.385  1.0
  O  O32  1  0.496  0.885  0.684  1.0
  O  O33  1  0.941  0.090  0.742  1.0
  O  O34  1  0.684  0.496  0.885  1.0
  O  O35  1  0.885  0.684  0.496  1.0
[/CIF]
.