The material structure described by V3Fe2Ni(PO4)6 crystallizes in the trigonal R3 space group. There are three inequivalent V sites. In the first V site, V(1) is bonded to three equivalent O(4) and three equivalent O(8) atoms to form VO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. In the second V site, V(2) is bonded to three equivalent O(2) and three equivalent O(5) atoms to form VO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Fe(1)O6 octahedra. In the third V site, V(3) is bonded to three equivalent O(1) and three equivalent O(7) atoms to form VO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to three equivalent O(2) and three equivalent O(6) atoms to form distorted FeO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  a faceface with one V(2)O6 octahedra, and  a faceface with one Ni(1)O6 octahedra. In the second Fe site, Fe(2) is bonded in a 6-coordinate geometry to three equivalent O(4) and three equivalent O(7) atoms. Ni(1) is bonded to three equivalent O(3) and three equivalent O(6) atoms to form NiO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Fe(1)O6 octahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one V(3)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra, and  a cornercorner with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-48°. In the second P site, P(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one V(3)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra, and  a cornercorner with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-49°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one V(3) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one V(2), one Fe(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Ni(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one V(1), one Fe(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one V(2) and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Fe(1), one Ni(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one V(3), one Fe(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one V(1) and one P(2) atom. is represented by the CIF card [CIF]
data_V3Fe2Ni(PO4)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.487
_cell_length_b   8.487
_cell_length_c   8.487
_cell_angle_alpha   61.172
_cell_angle_beta   61.172
_cell_angle_gamma   61.172
_symmetry_Int_Tables_number   1
_cell_volume   443.731
_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  0.357  0.357  0.357  1.0
  V  V1  1  0.141  0.141  0.141  1.0
  V  V2  1  0.644  0.644  0.644  1.0
  Fe  Fe3  1  0.997  0.997  0.997  1.0
  Fe  Fe4  1  0.499  0.499  0.499  1.0
  Ni  Ni5  1  0.858  0.858  0.858  1.0
  P  P6  1  0.459  0.752  0.043  1.0
  P  P7  1  0.752  0.043  0.459  1.0
  P  P8  1  0.043  0.459  0.752  1.0
  P  P9  1  0.958  0.542  0.251  1.0
  P  P10  1  0.251  0.958  0.542  1.0
  P  P11  1  0.542  0.251  0.958  1.0
  O  O12  1  0.689  0.880  0.496  1.0
  O  O13  1  0.880  0.496  0.689  1.0
  O  O14  1  0.496  0.689  0.880  1.0
  O  O15  1  0.258  0.912  0.059  1.0
  O  O16  1  0.612  0.811  0.016  1.0
  O  O17  1  0.433  0.588  0.241  1.0
  O  O18  1  0.912  0.059  0.258  1.0
  O  O19  1  0.588  0.241  0.433  1.0
  O  O20  1  0.998  0.380  0.187  1.0
  O  O21  1  0.241  0.433  0.588  1.0
  O  O22  1  0.948  0.736  0.096  1.0
  O  O23  1  0.187  0.998  0.380  1.0
  O  O24  1  0.811  0.016  0.612  1.0
  O  O25  1  0.059  0.258  0.912  1.0
  O  O26  1  0.762  0.552  0.416  1.0
  O  O27  1  0.016  0.612  0.811  1.0
  O  O28  1  0.416  0.762  0.552  1.0
  O  O29  1  0.096  0.948  0.736  1.0
  O  O30  1  0.552  0.416  0.762  1.0
  O  O31  1  0.380  0.187  0.998  1.0
  O  O32  1  0.736  0.096  0.948  1.0
  O  O33  1  0.492  0.326  0.115  1.0
  O  O34  1  0.115  0.492  0.326  1.0
  O  O35  1  0.326  0.115  0.492  1.0
[/CIF]
.
The material structure described by V3Fe2Ni(PO4)6 crystallizes in the trigonal R3 space group. There are three inequivalent V sites. In the first V site, V(1) is bonded to three equivalent O(4) and three equivalent O(8) atoms to form VO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. In the second V site, V(2) is bonded to three equivalent O(2) and three equivalent O(5) atoms to form VO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Fe(1)O6 octahedra. In the third V site, V(3) is bonded to three equivalent O(1) and three equivalent O(7) atoms to form VO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to three equivalent O(2) and three equivalent O(6) atoms to form distorted FeO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  a faceface with one V(2)O6 octahedra, and  a faceface with one Ni(1)O6 octahedra. In the second Fe site, Fe(2) is bonded in a 6-coordinate geometry to three equivalent O(4) and three equivalent O(7) atoms. Ni(1) is bonded to three equivalent O(3) and three equivalent O(6) atoms to form NiO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Fe(1)O6 octahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one V(3)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra, and  a cornercorner with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-48°. In the second P site, P(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one V(3)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra, and  a cornercorner with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-49°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one V(3) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one V(2), one Fe(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Ni(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one V(1), one Fe(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one V(2) and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Fe(1), one Ni(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one V(3), one Fe(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one V(1) and one P(2) atom. is represented by the CIF card [CIF]
data_V3Fe2Ni(PO4)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.487
_cell_length_b   8.487
_cell_length_c   8.487
_cell_angle_alpha   61.172
_cell_angle_beta   61.172
_cell_angle_gamma   61.172
_symmetry_Int_Tables_number   1
_cell_volume   443.731
_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  0.357  0.357  0.357  1.0
  V  V1  1  0.141  0.141  0.141  1.0
  V  V2  1  0.644  0.644  0.644  1.0
  Fe  Fe3  1  0.997  0.997  0.997  1.0
  Fe  Fe4  1  0.499  0.499  0.499  1.0
  Ni  Ni5  1  0.858  0.858  0.858  1.0
  P  P6  1  0.459  0.752  0.043  1.0
  P  P7  1  0.752  0.043  0.459  1.0
  P  P8  1  0.043  0.459  0.752  1.0
  P  P9  1  0.958  0.542  0.251  1.0
  P  P10  1  0.251  0.958  0.542  1.0
  P  P11  1  0.542  0.251  0.958  1.0
  O  O12  1  0.689  0.880  0.496  1.0
  O  O13  1  0.880  0.496  0.689  1.0
  O  O14  1  0.496  0.689  0.880  1.0
  O  O15  1  0.258  0.912  0.059  1.0
  O  O16  1  0.612  0.811  0.016  1.0
  O  O17  1  0.433  0.588  0.241  1.0
  O  O18  1  0.912  0.059  0.258  1.0
  O  O19  1  0.588  0.241  0.433  1.0
  O  O20  1  0.998  0.380  0.187  1.0
  O  O21  1  0.241  0.433  0.588  1.0
  O  O22  1  0.948  0.736  0.096  1.0
  O  O23  1  0.187  0.998  0.380  1.0
  O  O24  1  0.811  0.016  0.612  1.0
  O  O25  1  0.059  0.258  0.912  1.0
  O  O26  1  0.762  0.552  0.416  1.0
  O  O27  1  0.016  0.612  0.811  1.0
  O  O28  1  0.416  0.762  0.552  1.0
  O  O29  1  0.096  0.948  0.736  1.0
  O  O30  1  0.552  0.416  0.762  1.0
  O  O31  1  0.380  0.187  0.998  1.0
  O  O32  1  0.736  0.096  0.948  1.0
  O  O33  1  0.492  0.326  0.115  1.0
  O  O34  1  0.115  0.492  0.326  1.0
  O  O35  1  0.326  0.115  0.492  1.0
[/CIF]
.