The material described by Li3Ni2(PO4)3 crystallizes in the monoclinic C2/c space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded in a 6-coordinate geometry to two equivalent O(3) and four equivalent O(1) atoms. In the second Li site, Li(2) is bonded in a 6-coordinate geometry to two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. In the third Li site, Li(3) is bonded in a 6-coordinate geometry to two equivalent O(5) and four equivalent O(4) atoms. Ni(1) is bonded to one O(1), one O(3), one O(5), one O(6), and two equivalent O(2) atoms to form NiO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra, corners with four equivalent P(1)O4 tetrahedra, and  an edgeedge with one Ni(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 corners with four equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-57°. In the second P site, P(2) is bonded to two equivalent O(5) and two equivalent O(6) atoms to form PO4 tetrahedra that share corners with four equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-57°. There are six inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), one Ni(1), and one P(1) atom to form a mixture of distorted corner and edge-sharing OLi2NiP tetrahedra. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ni(1) and one P(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one Ni(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Li(2), two equivalent Li(3), and one P(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Li(3), one Ni(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Li(2), one Ni(1), and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li3Ni2(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.526
_cell_length_b   8.526
_cell_length_c   6.317
_cell_angle_alpha   74.240
_cell_angle_beta   74.240
_cell_angle_gamma   94.513
_symmetry_Int_Tables_number   1
_cell_volume   419.477
_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
  Li  Li0  1  0.019  0.981  0.750  1.0
  Li  Li1  1  0.287  0.713  0.750  1.0
  Li  Li2  1  0.500  0.500  0.500  1.0
  Li  Li3  1  0.713  0.287  0.250  1.0
  Li  Li4  1  0.981  0.019  0.250  1.0
  Li  Li5  1  0.500  0.500  0.000  1.0
  Ni  Ni6  1  0.946  0.625  0.631  1.0
  Ni  Ni7  1  0.625  0.946  0.131  1.0
  Ni  Ni8  1  0.375  0.054  0.869  1.0
  Ni  Ni9  1  0.054  0.375  0.369  1.0
  P  P10  1  0.335  0.135  0.365  1.0
  P  P11  1  0.135  0.335  0.865  1.0
  P  P12  1  0.288  0.712  0.250  1.0
  P  P13  1  0.712  0.288  0.750  1.0
  P  P14  1  0.665  0.865  0.635  1.0
  P  P15  1  0.865  0.665  0.135  1.0
  O  O16  1  0.848  0.850  0.104  1.0
  O  O17  1  0.150  0.152  0.396  1.0
  O  O18  1  0.399  0.047  0.177  1.0
  O  O19  1  0.337  0.008  0.594  1.0
  O  O20  1  0.992  0.663  0.906  1.0
  O  O21  1  0.850  0.848  0.604  1.0
  O  O22  1  0.601  0.953  0.823  1.0
  O  O23  1  0.663  0.992  0.406  1.0
  O  O24  1  0.008  0.337  0.094  1.0
  O  O25  1  0.953  0.601  0.323  1.0
  O  O26  1  0.548  0.702  0.698  1.0
  O  O27  1  0.735  0.466  0.768  1.0
  O  O28  1  0.739  0.178  0.973  1.0
  O  O29  1  0.702  0.548  0.198  1.0
  O  O30  1  0.152  0.150  0.896  1.0
  O  O31  1  0.822  0.261  0.527  1.0
  O  O32  1  0.178  0.739  0.473  1.0
  O  O33  1  0.534  0.265  0.732  1.0
  O  O34  1  0.298  0.452  0.802  1.0
  O  O35  1  0.261  0.822  0.027  1.0
  O  O36  1  0.265  0.534  0.232  1.0
  O  O37  1  0.452  0.298  0.302  1.0
  O  O38  1  0.047  0.399  0.677  1.0
  O  O39  1  0.466  0.735  0.268  1.0
[/CIF]
.
The material described by Li3Ni2(PO4)3 crystallizes in the monoclinic C2/c space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded in a 6-coordinate geometry to two equivalent O(3) and four equivalent O(1) atoms. In the second Li site, Li(2) is bonded in a 6-coordinate geometry to two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. In the third Li site, Li(3) is bonded in a 6-coordinate geometry to two equivalent O(5) and four equivalent O(4) atoms. Ni(1) is bonded to one O(1), one O(3), one O(5), one O(6), and two equivalent O(2) atoms to form NiO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra, corners with four equivalent P(1)O4 tetrahedra, and  an edgeedge with one Ni(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 corners with four equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-57°. In the second P site, P(2) is bonded to two equivalent O(5) and two equivalent O(6) atoms to form PO4 tetrahedra that share corners with four equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-57°. There are six inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), one Ni(1), and one P(1) atom to form a mixture of distorted corner and edge-sharing OLi2NiP tetrahedra. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ni(1) and one P(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one Ni(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Li(2), two equivalent Li(3), and one P(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Li(3), one Ni(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Li(2), one Ni(1), and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li3Ni2(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.526
_cell_length_b   8.526
_cell_length_c   6.317
_cell_angle_alpha   74.240
_cell_angle_beta   74.240
_cell_angle_gamma   94.513
_symmetry_Int_Tables_number   1
_cell_volume   419.477
_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
  Li  Li0  1  0.019  0.981  0.750  1.0
  Li  Li1  1  0.287  0.713  0.750  1.0
  Li  Li2  1  0.500  0.500  0.500  1.0
  Li  Li3  1  0.713  0.287  0.250  1.0
  Li  Li4  1  0.981  0.019  0.250  1.0
  Li  Li5  1  0.500  0.500  0.000  1.0
  Ni  Ni6  1  0.946  0.625  0.631  1.0
  Ni  Ni7  1  0.625  0.946  0.131  1.0
  Ni  Ni8  1  0.375  0.054  0.869  1.0
  Ni  Ni9  1  0.054  0.375  0.369  1.0
  P  P10  1  0.335  0.135  0.365  1.0
  P  P11  1  0.135  0.335  0.865  1.0
  P  P12  1  0.288  0.712  0.250  1.0
  P  P13  1  0.712  0.288  0.750  1.0
  P  P14  1  0.665  0.865  0.635  1.0
  P  P15  1  0.865  0.665  0.135  1.0
  O  O16  1  0.848  0.850  0.104  1.0
  O  O17  1  0.150  0.152  0.396  1.0
  O  O18  1  0.399  0.047  0.177  1.0
  O  O19  1  0.337  0.008  0.594  1.0
  O  O20  1  0.992  0.663  0.906  1.0
  O  O21  1  0.850  0.848  0.604  1.0
  O  O22  1  0.601  0.953  0.823  1.0
  O  O23  1  0.663  0.992  0.406  1.0
  O  O24  1  0.008  0.337  0.094  1.0
  O  O25  1  0.953  0.601  0.323  1.0
  O  O26  1  0.548  0.702  0.698  1.0
  O  O27  1  0.735  0.466  0.768  1.0
  O  O28  1  0.739  0.178  0.973  1.0
  O  O29  1  0.702  0.548  0.198  1.0
  O  O30  1  0.152  0.150  0.896  1.0
  O  O31  1  0.822  0.261  0.527  1.0
  O  O32  1  0.178  0.739  0.473  1.0
  O  O33  1  0.534  0.265  0.732  1.0
  O  O34  1  0.298  0.452  0.802  1.0
  O  O35  1  0.261  0.822  0.027  1.0
  O  O36  1  0.265  0.534  0.232  1.0
  O  O37  1  0.452  0.298  0.302  1.0
  O  O38  1  0.047  0.399  0.677  1.0
  O  O39  1  0.466  0.735  0.268  1.0
[/CIF]
.