The compound described by Li2Cr5(PO4)4 crystallizes in the triclinic P-1 space group. Li(1) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(6), and one O(8) atom. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(7) atom to form distorted CrO5 trigonal bipyramids that share corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra,  a cornercorner with one Cr(2)O5 trigonal bipyramid, and  an edgeedge with one Cr(2)O5 trigonal bipyramid. In the second Cr site, Cr(2) is bonded to one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form distorted CrO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  a cornercorner with one Cr(1)O5 trigonal bipyramid,  an edgeedge with one Cr(3)O6 octahedra, and  an edgeedge with one Cr(1)O5 trigonal bipyramid. In the third Cr site, Cr(3) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms to form distorted CrO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with four equivalent P(2)O4 tetrahedra, and edges with two equivalent Cr(2)O5 trigonal bipyramids. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(3)O6 octahedra, corners with two equivalent Cr(2)O5 trigonal bipyramids, and corners with three equivalent Cr(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 55°. In the second P site, P(2) is bonded to one O(3), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Cr(3)O6 octahedra, corners with two equivalent Cr(1)O5 trigonal bipyramids, and corners with three equivalent Cr(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 38-45°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Li(1), one Cr(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(2), and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Cr(2), one Cr(3), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(2), and one P(2) atom. In the sixth O site, O(6) is bonded to one Li(1), one Cr(2), one Cr(3), and one P(1) atom to form distorted corner-sharing OLiCr2P trigonal pyramids. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Cr(1), one Cr(2), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Li(1), one Cr(3), and one P(2) atom. is represented by the CIF card [CIF]
data_Li2Cr5(PO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.467
_cell_length_b   8.076
_cell_length_c   8.534
_cell_angle_alpha   114.943
_cell_angle_beta   88.597
_cell_angle_gamma   101.311
_symmetry_Int_Tables_number   1
_cell_volume   334.266
_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
  Li  Li0  1  0.642  0.093  0.275  1.0
  Li  Li1  1  0.358  0.907  0.725  1.0
  Cr  Cr2  1  0.665  0.418  0.682  1.0
  Cr  Cr3  1  0.122  0.249  0.783  1.0
  Cr  Cr4  1  0.000  0.000  0.000  1.0
  Cr  Cr5  1  0.878  0.751  0.217  1.0
  Cr  Cr6  1  0.335  0.582  0.318  1.0
  P  P7  1  0.128  0.209  0.420  1.0
  P  P8  1  0.872  0.791  0.580  1.0
  P  P9  1  0.640  0.299  0.020  1.0
  P  P10  1  0.360  0.701  0.980  1.0
  O  O11  1  0.287  0.354  0.370  1.0
  O  O12  1  0.124  0.743  0.504  1.0
  O  O13  1  0.634  0.496  0.168  1.0
  O  O14  1  0.625  0.810  0.056  1.0
  O  O15  1  0.212  0.667  0.127  1.0
  O  O16  1  0.052  0.020  0.250  1.0
  O  O17  1  0.713  0.646  0.630  1.0
  O  O18  1  0.366  0.504  0.832  1.0
  O  O19  1  0.375  0.190  0.944  1.0
  O  O20  1  0.788  0.333  0.873  1.0
  O  O21  1  0.711  0.832  0.458  1.0
  O  O22  1  0.289  0.168  0.542  1.0
  O  O23  1  0.771  0.193  0.095  1.0
  O  O24  1  0.876  0.257  0.496  1.0
  O  O25  1  0.948  0.980  0.750  1.0
  O  O26  1  0.229  0.807  0.905  1.0
[/CIF]
.
The compound described by Li2Cr5(PO4)4 crystallizes in the triclinic P-1 space group. Li(1) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(6), and one O(8) atom. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(7) atom to form distorted CrO5 trigonal bipyramids that share corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra,  a cornercorner with one Cr(2)O5 trigonal bipyramid, and  an edgeedge with one Cr(2)O5 trigonal bipyramid. In the second Cr site, Cr(2) is bonded to one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form distorted CrO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  a cornercorner with one Cr(1)O5 trigonal bipyramid,  an edgeedge with one Cr(3)O6 octahedra, and  an edgeedge with one Cr(1)O5 trigonal bipyramid. In the third Cr site, Cr(3) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms to form distorted CrO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with four equivalent P(2)O4 tetrahedra, and edges with two equivalent Cr(2)O5 trigonal bipyramids. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(3)O6 octahedra, corners with two equivalent Cr(2)O5 trigonal bipyramids, and corners with three equivalent Cr(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 55°. In the second P site, P(2) is bonded to one O(3), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Cr(3)O6 octahedra, corners with two equivalent Cr(1)O5 trigonal bipyramids, and corners with three equivalent Cr(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 38-45°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Li(1), one Cr(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(2), and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Cr(2), one Cr(3), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(2), and one P(2) atom. In the sixth O site, O(6) is bonded to one Li(1), one Cr(2), one Cr(3), and one P(1) atom to form distorted corner-sharing OLiCr2P trigonal pyramids. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Cr(1), one Cr(2), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Li(1), one Cr(3), and one P(2) atom. is represented by the CIF card [CIF]
data_Li2Cr5(PO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.467
_cell_length_b   8.076
_cell_length_c   8.534
_cell_angle_alpha   114.943
_cell_angle_beta   88.597
_cell_angle_gamma   101.311
_symmetry_Int_Tables_number   1
_cell_volume   334.266
_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
  Li  Li0  1  0.642  0.093  0.275  1.0
  Li  Li1  1  0.358  0.907  0.725  1.0
  Cr  Cr2  1  0.665  0.418  0.682  1.0
  Cr  Cr3  1  0.122  0.249  0.783  1.0
  Cr  Cr4  1  0.000  0.000  0.000  1.0
  Cr  Cr5  1  0.878  0.751  0.217  1.0
  Cr  Cr6  1  0.335  0.582  0.318  1.0
  P  P7  1  0.128  0.209  0.420  1.0
  P  P8  1  0.872  0.791  0.580  1.0
  P  P9  1  0.640  0.299  0.020  1.0
  P  P10  1  0.360  0.701  0.980  1.0
  O  O11  1  0.287  0.354  0.370  1.0
  O  O12  1  0.124  0.743  0.504  1.0
  O  O13  1  0.634  0.496  0.168  1.0
  O  O14  1  0.625  0.810  0.056  1.0
  O  O15  1  0.212  0.667  0.127  1.0
  O  O16  1  0.052  0.020  0.250  1.0
  O  O17  1  0.713  0.646  0.630  1.0
  O  O18  1  0.366  0.504  0.832  1.0
  O  O19  1  0.375  0.190  0.944  1.0
  O  O20  1  0.788  0.333  0.873  1.0
  O  O21  1  0.711  0.832  0.458  1.0
  O  O22  1  0.289  0.168  0.542  1.0
  O  O23  1  0.771  0.193  0.095  1.0
  O  O24  1  0.876  0.257  0.496  1.0
  O  O25  1  0.948  0.980  0.750  1.0
  O  O26  1  0.229  0.807  0.905  1.0
[/CIF]
.