The structure described by Li2CoP2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a see-saw-like geometry to one O(2), one O(4), and two equivalent O(5) atoms. In the second Li site, Li(2) is bonded to one O(1), one O(3), and two equivalent O(7) atoms to form distorted LiO4 tetrahedra that share corners with two equivalent Co(1)O5 square pyramids,  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  an edgeedge with one Co(1)O5 square pyramid, and  an edgeedge with one Li(2)O4 tetrahedra. Co(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(7) atom to form CoO5 square pyramids that share corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one Li(2)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(4), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Co(1)O5 square pyramids,  a cornercorner with one Li(2)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. In the second P site, P(2) is bonded to one O(3), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Co(1)O5 square pyramids,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent Li(2)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Li(2), one Co(1), and one P(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(1), one Co(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(2), one Co(1), and one P(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Li(1), one Co(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent Li(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(7) is bonded to two equivalent Li(2), one Co(1), and one P(2) atom to form distorted edge-sharing OLi2CoP trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2CoP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.190
_cell_length_b   7.259
_cell_length_c   8.228
_cell_angle_alpha   65.896
_cell_angle_beta   85.587
_cell_angle_gamma   81.103
_symmetry_Int_Tables_number   1
_cell_volume   279.503
_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
  Co  Co0  1  0.183  0.728  0.273  1.0
  Co  Co1  1  0.817  0.272  0.727  1.0
  Li  Li2  1  0.705  0.820  0.559  1.0
  Li  Li3  1  0.295  0.180  0.441  1.0
  Li  Li4  1  0.294  0.134  0.006  1.0
  Li  Li5  1  0.706  0.866  0.994  1.0
  O  O6  1  0.171  0.336  0.779  1.0
  O  O7  1  0.829  0.664  0.221  1.0
  O  O8  1  0.899  0.304  0.465  1.0
  O  O9  1  0.101  0.696  0.535  1.0
  O  O10  1  0.946  0.964  0.799  1.0
  O  O11  1  0.054  0.036  0.201  1.0
  O  O12  1  0.438  0.465  0.344  1.0
  O  O13  1  0.562  0.535  0.656  1.0
  O  O14  1  0.586  0.044  0.328  1.0
  O  O15  1  0.414  0.956  0.672  1.0
  O  O16  1  0.215  0.628  0.853  1.0
  O  O17  1  0.785  0.372  0.147  1.0
  O  O18  1  0.336  0.842  0.005  1.0
  O  O19  1  0.664  0.158  0.995  1.0
  P  P20  1  0.734  0.454  0.305  1.0
  P  P21  1  0.266  0.546  0.695  1.0
  P  P22  1  0.769  0.139  0.174  1.0
  P  P23  1  0.231  0.861  0.826  1.0
[/CIF]
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The structure described by Li2CoP2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a see-saw-like geometry to one O(2), one O(4), and two equivalent O(5) atoms. In the second Li site, Li(2) is bonded to one O(1), one O(3), and two equivalent O(7) atoms to form distorted LiO4 tetrahedra that share corners with two equivalent Co(1)O5 square pyramids,  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  an edgeedge with one Co(1)O5 square pyramid, and  an edgeedge with one Li(2)O4 tetrahedra. Co(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(7) atom to form CoO5 square pyramids that share corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one Li(2)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(4), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Co(1)O5 square pyramids,  a cornercorner with one Li(2)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. In the second P site, P(2) is bonded to one O(3), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Co(1)O5 square pyramids,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent Li(2)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Li(2), one Co(1), and one P(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(1), one Co(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(2), one Co(1), and one P(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Li(1), one Co(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent Li(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(7) is bonded to two equivalent Li(2), one Co(1), and one P(2) atom to form distorted edge-sharing OLi2CoP trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2CoP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.190
_cell_length_b   7.259
_cell_length_c   8.228
_cell_angle_alpha   65.896
_cell_angle_beta   85.587
_cell_angle_gamma   81.103
_symmetry_Int_Tables_number   1
_cell_volume   279.503
_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
  Co  Co0  1  0.183  0.728  0.273  1.0
  Co  Co1  1  0.817  0.272  0.727  1.0
  Li  Li2  1  0.705  0.820  0.559  1.0
  Li  Li3  1  0.295  0.180  0.441  1.0
  Li  Li4  1  0.294  0.134  0.006  1.0
  Li  Li5  1  0.706  0.866  0.994  1.0
  O  O6  1  0.171  0.336  0.779  1.0
  O  O7  1  0.829  0.664  0.221  1.0
  O  O8  1  0.899  0.304  0.465  1.0
  O  O9  1  0.101  0.696  0.535  1.0
  O  O10  1  0.946  0.964  0.799  1.0
  O  O11  1  0.054  0.036  0.201  1.0
  O  O12  1  0.438  0.465  0.344  1.0
  O  O13  1  0.562  0.535  0.656  1.0
  O  O14  1  0.586  0.044  0.328  1.0
  O  O15  1  0.414  0.956  0.672  1.0
  O  O16  1  0.215  0.628  0.853  1.0
  O  O17  1  0.785  0.372  0.147  1.0
  O  O18  1  0.336  0.842  0.005  1.0
  O  O19  1  0.664  0.158  0.995  1.0
  P  P20  1  0.734  0.454  0.305  1.0
  P  P21  1  0.266  0.546  0.695  1.0
  P  P22  1  0.769  0.139  0.174  1.0
  P  P23  1  0.231  0.861  0.826  1.0
[/CIF]
.