The structure described by Li2CoP2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(4), and two equivalent O(3) atoms to form distorted LiO4 tetrahedra that share corners with two equivalent Co(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Li(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 66-78°. In the second Li site, Li(2) is bonded in a trigonal non-coplanar geometry to one O(1), one O(5), and one O(7) atom. Co(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form CoO6 octahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. 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(6) atom to form PO4 tetrahedra that share corners with three equivalent Co(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with three equivalent Li(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 31-56°. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Co(1)O6 octahedra,  a cornercorner with one Li(1)O4 tetrahedra, and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-56°. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(7) is bonded in a trigonal planar geometry to one Li(2), one Co(1), and one P(2) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(2), one Co(1), and one P(1) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Li(1), one Co(1), and one P(1) atom. In the fifth O site, O(3) is bonded to two equivalent Li(1), one Co(1), and one P(1) atom to form distorted edge-sharing OLi2CoP trigonal pyramids. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one Co(1), and one P(2) atom. In the seventh O site, O(5) is bonded in a trigonal planar geometry to one Li(2), one Co(1), and one P(2) atom. is represented by the CIF file [CIF]
data_Li2CoP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.051
_cell_length_b   8.518
_cell_length_c   13.887
_cell_angle_alpha   65.263
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   542.717
_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
  Li  Li0  1  0.219  0.508  0.577  1.0
  Li  Li1  1  0.238  0.046  0.827  1.0
  Li  Li2  1  0.719  0.492  0.923  1.0
  Li  Li3  1  0.738  0.954  0.673  1.0
  Li  Li4  1  0.781  0.492  0.423  1.0
  Li  Li5  1  0.762  0.954  0.173  1.0
  Li  Li6  1  0.262  0.046  0.327  1.0
  Li  Li7  1  0.281  0.508  0.077  1.0
  Co  Co8  1  0.740  0.776  0.478  1.0
  Co  Co9  1  0.760  0.776  0.978  1.0
  Co  Co10  1  0.260  0.224  0.522  1.0
  Co  Co11  1  0.240  0.224  0.022  1.0
  P  P12  1  0.267  0.673  0.353  1.0
  P  P13  1  0.736  0.189  0.880  1.0
  P  P14  1  0.264  0.811  0.120  1.0
  P  P15  1  0.767  0.327  0.147  1.0
  P  P16  1  0.233  0.673  0.853  1.0
  P  P17  1  0.733  0.327  0.647  1.0
  P  P18  1  0.764  0.189  0.380  1.0
  P  P19  1  0.236  0.811  0.620  1.0
  O  O20  1  0.093  0.817  0.359  1.0
  O  O21  1  0.066  0.297  0.139  1.0
  O  O22  1  0.824  0.506  0.567  1.0
  O  O23  1  0.934  0.703  0.861  1.0
  O  O24  1  0.566  0.703  0.361  1.0
  O  O25  1  0.676  0.506  0.067  1.0
  O  O26  1  0.624  0.272  0.445  1.0
  O  O27  1  0.563  0.832  0.098  1.0
  O  O28  1  0.937  0.832  0.598  1.0
  O  O29  1  0.434  0.297  0.639  1.0
  O  O30  1  0.176  0.494  0.433  1.0
  O  O31  1  0.063  0.168  0.402  1.0
  O  O32  1  0.220  0.665  0.240  1.0
  O  O33  1  0.124  0.728  0.055  1.0
  O  O34  1  0.593  0.183  0.141  1.0
  O  O35  1  0.868  0.025  0.883  1.0
  O  O36  1  0.324  0.494  0.933  1.0
  O  O37  1  0.780  0.335  0.760  1.0
  O  O38  1  0.132  0.975  0.117  1.0
  O  O39  1  0.876  0.272  0.945  1.0
  O  O40  1  0.437  0.168  0.902  1.0
  O  O41  1  0.720  0.335  0.260  1.0
  O  O42  1  0.280  0.665  0.740  1.0
  O  O43  1  0.907  0.183  0.641  1.0
  O  O44  1  0.376  0.728  0.555  1.0
  O  O45  1  0.368  0.975  0.617  1.0
  O  O46  1  0.632  0.025  0.383  1.0
  O  O47  1  0.407  0.817  0.859  1.0
[/CIF]
.
The structure described by Li2CoP2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(4), and two equivalent O(3) atoms to form distorted LiO4 tetrahedra that share corners with two equivalent Co(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Li(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 66-78°. In the second Li site, Li(2) is bonded in a trigonal non-coplanar geometry to one O(1), one O(5), and one O(7) atom. Co(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form CoO6 octahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. 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(6) atom to form PO4 tetrahedra that share corners with three equivalent Co(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with three equivalent Li(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 31-56°. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Co(1)O6 octahedra,  a cornercorner with one Li(1)O4 tetrahedra, and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-56°. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(7) is bonded in a trigonal planar geometry to one Li(2), one Co(1), and one P(2) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(2), one Co(1), and one P(1) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Li(1), one Co(1), and one P(1) atom. In the fifth O site, O(3) is bonded to two equivalent Li(1), one Co(1), and one P(1) atom to form distorted edge-sharing OLi2CoP trigonal pyramids. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one Co(1), and one P(2) atom. In the seventh O site, O(5) is bonded in a trigonal planar geometry to one Li(2), one Co(1), and one P(2) atom. is represented by the CIF file [CIF]
data_Li2CoP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.051
_cell_length_b   8.518
_cell_length_c   13.887
_cell_angle_alpha   65.263
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   542.717
_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
  Li  Li0  1  0.219  0.508  0.577  1.0
  Li  Li1  1  0.238  0.046  0.827  1.0
  Li  Li2  1  0.719  0.492  0.923  1.0
  Li  Li3  1  0.738  0.954  0.673  1.0
  Li  Li4  1  0.781  0.492  0.423  1.0
  Li  Li5  1  0.762  0.954  0.173  1.0
  Li  Li6  1  0.262  0.046  0.327  1.0
  Li  Li7  1  0.281  0.508  0.077  1.0
  Co  Co8  1  0.740  0.776  0.478  1.0
  Co  Co9  1  0.760  0.776  0.978  1.0
  Co  Co10  1  0.260  0.224  0.522  1.0
  Co  Co11  1  0.240  0.224  0.022  1.0
  P  P12  1  0.267  0.673  0.353  1.0
  P  P13  1  0.736  0.189  0.880  1.0
  P  P14  1  0.264  0.811  0.120  1.0
  P  P15  1  0.767  0.327  0.147  1.0
  P  P16  1  0.233  0.673  0.853  1.0
  P  P17  1  0.733  0.327  0.647  1.0
  P  P18  1  0.764  0.189  0.380  1.0
  P  P19  1  0.236  0.811  0.620  1.0
  O  O20  1  0.093  0.817  0.359  1.0
  O  O21  1  0.066  0.297  0.139  1.0
  O  O22  1  0.824  0.506  0.567  1.0
  O  O23  1  0.934  0.703  0.861  1.0
  O  O24  1  0.566  0.703  0.361  1.0
  O  O25  1  0.676  0.506  0.067  1.0
  O  O26  1  0.624  0.272  0.445  1.0
  O  O27  1  0.563  0.832  0.098  1.0
  O  O28  1  0.937  0.832  0.598  1.0
  O  O29  1  0.434  0.297  0.639  1.0
  O  O30  1  0.176  0.494  0.433  1.0
  O  O31  1  0.063  0.168  0.402  1.0
  O  O32  1  0.220  0.665  0.240  1.0
  O  O33  1  0.124  0.728  0.055  1.0
  O  O34  1  0.593  0.183  0.141  1.0
  O  O35  1  0.868  0.025  0.883  1.0
  O  O36  1  0.324  0.494  0.933  1.0
  O  O37  1  0.780  0.335  0.760  1.0
  O  O38  1  0.132  0.975  0.117  1.0
  O  O39  1  0.876  0.272  0.945  1.0
  O  O40  1  0.437  0.168  0.902  1.0
  O  O41  1  0.720  0.335  0.260  1.0
  O  O42  1  0.280  0.665  0.740  1.0
  O  O43  1  0.907  0.183  0.641  1.0
  O  O44  1  0.376  0.728  0.555  1.0
  O  O45  1  0.368  0.975  0.617  1.0
  O  O46  1  0.632  0.025  0.383  1.0
  O  O47  1  0.407  0.817  0.859  1.0
[/CIF]
.