The crystal structure described by Li2CoP2O7 crystallizes in the monoclinic C2/c space group. Li(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form LiO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra and  an edgeedge with one Li(1)O4 tetrahedra. Co(1) is bonded in a square co-planar geometry to two equivalent O(2) and two equivalent O(3) atoms. 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 P(1)O4 tetrahedra and corners with four equivalent Li(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent P(1) atoms. In the second 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 third O site, O(3) is bonded in a 3-coordinate geometry to one Li(1), one Co(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Li(1) and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2CoP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.992
_cell_length_b   8.159
_cell_length_c   8.843
_cell_angle_alpha   113.532
_cell_angle_beta   89.998
_cell_angle_gamma   107.817
_symmetry_Int_Tables_number   1
_cell_volume   311.291
_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  0.500  0.500  0.500  1.0
  Co  Co1  1  0.500  0.500  1.000  1.0
  Li  Li2  1  0.549  0.879  0.052  1.0
  Li  Li3  1  0.170  0.121  0.448  1.0
  Li  Li4  1  0.451  0.121  0.948  1.0
  Li  Li5  1  0.830  0.879  0.552  1.0
  O  O6  1  0.977  0.500  0.250  1.0
  O  O7  1  0.023  0.500  0.750  1.0
  O  O8  1  0.378  0.709  0.161  1.0
  O  O9  1  0.169  0.291  0.339  1.0
  O  O10  1  0.831  0.709  0.661  1.0
  O  O11  1  0.622  0.291  0.839  1.0
  O  O12  1  0.554  0.300  0.559  1.0
  O  O13  1  0.446  0.700  0.441  1.0
  O  O14  1  0.754  0.700  0.941  1.0
  O  O15  1  0.246  0.300  0.059  1.0
  O  O16  1  0.746  0.145  0.111  1.0
  O  O17  1  0.254  0.855  0.889  1.0
  O  O18  1  0.898  0.145  0.611  1.0
  O  O19  1  0.102  0.855  0.389  1.0
  P  P20  1  0.033  0.296  0.185  1.0
  P  P21  1  0.763  0.296  0.685  1.0
  P  P22  1  0.967  0.704  0.815  1.0
  P  P23  1  0.237  0.704  0.315  1.0
[/CIF]
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The crystal structure described by Li2CoP2O7 crystallizes in the monoclinic C2/c space group. Li(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form LiO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra and  an edgeedge with one Li(1)O4 tetrahedra. Co(1) is bonded in a square co-planar geometry to two equivalent O(2) and two equivalent O(3) atoms. 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 P(1)O4 tetrahedra and corners with four equivalent Li(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent P(1) atoms. In the second 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 third O site, O(3) is bonded in a 3-coordinate geometry to one Li(1), one Co(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Li(1) and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2CoP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.992
_cell_length_b   8.159
_cell_length_c   8.843
_cell_angle_alpha   113.532
_cell_angle_beta   89.998
_cell_angle_gamma   107.817
_symmetry_Int_Tables_number   1
_cell_volume   311.291
_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  0.500  0.500  0.500  1.0
  Co  Co1  1  0.500  0.500  1.000  1.0
  Li  Li2  1  0.549  0.879  0.052  1.0
  Li  Li3  1  0.170  0.121  0.448  1.0
  Li  Li4  1  0.451  0.121  0.948  1.0
  Li  Li5  1  0.830  0.879  0.552  1.0
  O  O6  1  0.977  0.500  0.250  1.0
  O  O7  1  0.023  0.500  0.750  1.0
  O  O8  1  0.378  0.709  0.161  1.0
  O  O9  1  0.169  0.291  0.339  1.0
  O  O10  1  0.831  0.709  0.661  1.0
  O  O11  1  0.622  0.291  0.839  1.0
  O  O12  1  0.554  0.300  0.559  1.0
  O  O13  1  0.446  0.700  0.441  1.0
  O  O14  1  0.754  0.700  0.941  1.0
  O  O15  1  0.246  0.300  0.059  1.0
  O  O16  1  0.746  0.145  0.111  1.0
  O  O17  1  0.254  0.855  0.889  1.0
  O  O18  1  0.898  0.145  0.611  1.0
  O  O19  1  0.102  0.855  0.389  1.0
  P  P20  1  0.033  0.296  0.185  1.0
  P  P21  1  0.763  0.296  0.685  1.0
  P  P22  1  0.967  0.704  0.815  1.0
  P  P23  1  0.237  0.704  0.315  1.0
[/CIF]
.