The compound described by Li2CoP2O7 crystallizes in the triclinic P1 space group. There are eight inequivalent Li sites. In the first Li site, Li(1) is bonded in a distorted rectangular see-saw-like geometry to one O(13), one O(17), one O(20), and one O(9) atom. In the second Li site, Li(2) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(14), one O(18), and one O(19) atom. In the third Li site, Li(3) is bonded in a distorted rectangular see-saw-like geometry to one O(11), one O(15), one O(18), and one O(19) atom. In the fourth Li site, Li(4) is bonded in a distorted rectangular see-saw-like geometry to one O(12), one O(16), one O(17), and one O(20) atom. In the fifth Li site, Li(5) is bonded to one O(12), one O(17), one O(25), one O(3), and one O(5) atom to form distorted LiO5 trigonal bipyramids that share  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(8)O4 tetrahedra,  an edgeedge with one Co(4)O5 square pyramid, and  an edgeedge with one P(4)O4 tetrahedra. In the sixth Li site, Li(6) is bonded in a 5-coordinate geometry to one O(11), one O(18), one O(26), one O(4), and one O(6) atom. In the seventh Li site, Li(7) is bonded to one O(1), one O(10), one O(19), one O(27), and one O(7) atom to form distorted LiO5 trigonal bipyramids that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra,  an edgeedge with one Co(3)O5 square pyramid, and  an edgeedge with one P(2)O4 tetrahedra. In the eighth Li site, Li(8) is bonded to one O(2), one O(20), one O(28), one O(8), and one O(9) atom to form distorted LiO5 trigonal bipyramids that share  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(8)O4 tetrahedra,  an edgeedge with one Co(1)O5 square pyramid, and  an edgeedge with one P(1)O4 tetrahedra. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(16), one O(28), one O(4), and one O(8) atom to form CoO5 square pyramids that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra,  a cornercorner with one Li(7)O5 trigonal bipyramid, and  an edgeedge with one Li(8)O5 trigonal bipyramid. In the second Co site, Co(2) is bonded to one O(12), one O(14), one O(2), one O(26), and one O(6) atom to form CoO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra,  a cornercorner with one P(8)O4 tetrahedra,  a cornercorner with one Li(5)O5 trigonal bipyramid, and  a cornercorner with one Li(8)O5 trigonal bipyramid. In the third Co site, Co(3) is bonded to one O(15), one O(27), one O(3), one O(7), and one O(9) atom to form CoO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra,  a cornercorner with one Li(5)O5 trigonal bipyramid,  a cornercorner with one Li(8)O5 trigonal bipyramid, and  an edgeedge with one Li(7)O5 trigonal bipyramid. In the fourth Co site, Co(4) is bonded to one O(1), one O(11), one O(13), one O(25), and one O(5) atom to form CoO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra,  a cornercorner with one P(8)O4 tetrahedra,  a cornercorner with one Li(7)O5 trigonal bipyramid, and  an edgeedge with one Li(5)O5 trigonal bipyramid. There are eight inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(21), one O(5), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one Li(5)O5 trigonal bipyramid, and  an edgeedge with one Li(8)O5 trigonal bipyramid. In the second P site, P(2) is bonded to one O(1), one O(10), one O(22), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one P(6)O4 tetrahedra, and  an edgeedge with one Li(7)O5 trigonal bipyramid. In the third P site, P(3) is bonded to one O(11), one O(23), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one P(7)O4 tetrahedra, and  a cornercorner with one Li(7)O5 trigonal bipyramid. In the fourth P site, P(4) is bonded to one O(12), one O(24), one O(3), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one P(8)O4 tetrahedra,  a cornercorner with one Li(8)O5 trigonal bipyramid, and  an edgeedge with one Li(5)O5 trigonal bipyramid. In the fifth P site, P(5) is bonded to one O(15), one O(17), one O(21), and one O(28) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one Li(5)O5 trigonal bipyramid, and  a cornercorner with one Li(8)O5 trigonal bipyramid. In the sixth P site, P(6) is bonded to one O(16), one O(18), one O(22), and one O(27) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one Li(7)O5 trigonal bipyramid. In the seventh P site, P(7) is bonded to one O(13), one O(19), one O(23), and one O(26) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one Li(7)O5 trigonal bipyramid. In the eighth P site, P(8) is bonded to one O(14), one O(20), one O(24), and one O(25) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one Li(5)O5 trigonal bipyramid, and  a cornercorner with one Li(8)O5 trigonal bipyramid. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Li(7), one Co(4), and one P(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Li(8), one Co(2), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Li(5), one Co(3), and one P(4) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(6), one Co(1), and one P(3) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Li(5), one Co(4), and one P(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Li(6), one Co(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Li(7), one Co(3), and one P(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Li(8), one Co(1), and one P(4) atom. In the ninth O site, O(9) is bonded to one Li(1), one Li(8), one Co(3), and one P(1) atom to form a mixture of corner and edge-sharing OLi2CoP trigonal pyramids. In the tenth O site, O(10) is bonded to one Li(2), one Li(7), one Co(1), and one P(2) atom to form a mixture of corner and edge-sharing OLi2CoP trigonal pyramids. In the eleventh O site, O(11) is bonded to one Li(3), one Li(6), one Co(4), and one P(3) atom to form a mixture of distorted corner and edge-sharing OLi2CoP trigonal pyramids. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Li(4), one Li(5), one Co(2), and one P(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Li(1), one Co(4), and one P(7) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Li(2), one Co(2), and one P(8) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Li(3), one Co(3), and one P(5) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one Li(4), one Co(1), and one P(6) atom. In the seventeenth O site, O(17) is bonded to one Li(1), one Li(4), one Li(5), and one P(5) atom to form OLi3P trigonal pyramids that share  a cornercorner with one O(9)Li2CoP trigonal pyramid and  an edgeedge with one O(20)Li3P trigonal pyramid. In the eighteenth O site, O(18) is bonded to one Li(2), one Li(3), one Li(6), and one P(6) atom to form OLi3P trigonal pyramids that share  a cornercorner with one O(10)Li2CoP trigonal pyramid,  an edgeedge with one O(11)Li2CoP trigonal pyramid, and  an edgeedge with one O(19)Li3P trigonal pyramid. In the nineteenth O site, O(19) is bonded to one Li(2), one Li(3), one Li(7), and one P(7) atom to form OLi3P trigonal pyramids that share  a cornercorner with one O(11)Li2CoP trigonal pyramid,  an edgeedge with one O(10)Li2CoP trigonal pyramid, and  an edgeedge with one O(18)Li3P trigonal pyramid. In the twentieth O site, O(20) is bonded to one Li(1), one Li(4), one Li(8), and one P(8) atom to form OLi3P trigonal pyramids that share  an edgeedge with one O(9)Li2CoP trigonal pyramid and  an edgeedge with one O(17)Li3P trigonal pyramid. In the twenty-first O site, O(21) is bonded in a bent 150 degrees geometry to one P(1) and one P(5) atom. In the twenty-second O site, O(22) is bonded in a bent 150 degrees geometry to one P(2) and one P(6) atom. In the twenty-third O site, O(23) is bonded in a bent 150 degrees geometry to one P(3) and one P(7) atom. In the twenty-fourth O site, O(24) is bonded in a bent 150 degrees geometry to one P(4) and one P(8) atom. In the twenty-fifth O site, O(25) is bonded in a 3-coordinate geometry to one Li(5), one Co(4), and one P(8) atom. In the twenty-sixth O site, O(26) is bonded in a 3-coordinate geometry to one Li(6), one Co(2), and one P(7) atom. In the twenty-seventh O site, O(27) is bonded in a 3-coordinate geometry to one Li(7), one Co(3), and one P(6) atom. In the twenty-eighth O site, O(28) is bonded in a 3-coordinate geometry to one Li(8), one Co(1), and one P(5) atom. is represented by the CIF file [CIF]
data_Li2CoP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.079
_cell_length_b   7.071
_cell_length_c   8.789
_cell_angle_alpha   101.842
_cell_angle_beta   106.513
_cell_angle_gamma   109.565
_symmetry_Int_Tables_number   1
_cell_volume   268.907
_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  0.192  0.174  0.337  1.0
  Co  Co1  1  0.812  0.820  0.666  1.0
  Li  Li2  1  0.912  0.680  0.010  1.0
  Li  Li3  1  0.086  0.317  0.990  1.0
  Li  Li4  1  0.425  0.117  0.753  1.0
  Li  Li5  1  0.565  0.888  0.244  1.0
  O  O6  1  0.464  0.734  0.444  1.0
  O  O7  1  0.538  0.266  0.565  1.0
  O  O8  1  0.099  0.852  0.542  1.0
  O  O9  1  0.891  0.150  0.454  1.0
  O  O10  1  0.116  0.850  0.256  1.0
  O  O11  1  0.900  0.152  0.746  1.0
  O  O12  1  0.636  0.748  0.840  1.0
  O  O13  1  0.365  0.254  0.161  1.0
  O  O14  1  0.690  0.370  0.992  1.0
  O  O15  1  0.309  0.630  0.007  1.0
  O  O16  1  0.906  0.503  0.314  1.0
  O  O17  1  0.097  0.497  0.684  1.0
  O  O18  1  0.214  0.873  0.846  1.0
  O  O19  1  0.781  0.125  0.150  1.0
  P  P20  1  0.155  0.744  0.395  1.0
  P  P21  1  0.847  0.256  0.607  1.0
  P  P22  1  0.672  0.302  0.144  1.0
  P  P23  1  0.328  0.697  0.854  1.0
[/CIF]
.
The compound described by Li2CoP2O7 crystallizes in the triclinic P1 space group. There are eight inequivalent Li sites. In the first Li site, Li(1) is bonded in a distorted rectangular see-saw-like geometry to one O(13), one O(17), one O(20), and one O(9) atom. In the second Li site, Li(2) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(14), one O(18), and one O(19) atom. In the third Li site, Li(3) is bonded in a distorted rectangular see-saw-like geometry to one O(11), one O(15), one O(18), and one O(19) atom. In the fourth Li site, Li(4) is bonded in a distorted rectangular see-saw-like geometry to one O(12), one O(16), one O(17), and one O(20) atom. In the fifth Li site, Li(5) is bonded to one O(12), one O(17), one O(25), one O(3), and one O(5) atom to form distorted LiO5 trigonal bipyramids that share  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(8)O4 tetrahedra,  an edgeedge with one Co(4)O5 square pyramid, and  an edgeedge with one P(4)O4 tetrahedra. In the sixth Li site, Li(6) is bonded in a 5-coordinate geometry to one O(11), one O(18), one O(26), one O(4), and one O(6) atom. In the seventh Li site, Li(7) is bonded to one O(1), one O(10), one O(19), one O(27), and one O(7) atom to form distorted LiO5 trigonal bipyramids that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra,  an edgeedge with one Co(3)O5 square pyramid, and  an edgeedge with one P(2)O4 tetrahedra. In the eighth Li site, Li(8) is bonded to one O(2), one O(20), one O(28), one O(8), and one O(9) atom to form distorted LiO5 trigonal bipyramids that share  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(8)O4 tetrahedra,  an edgeedge with one Co(1)O5 square pyramid, and  an edgeedge with one P(1)O4 tetrahedra. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(16), one O(28), one O(4), and one O(8) atom to form CoO5 square pyramids that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra,  a cornercorner with one Li(7)O5 trigonal bipyramid, and  an edgeedge with one Li(8)O5 trigonal bipyramid. In the second Co site, Co(2) is bonded to one O(12), one O(14), one O(2), one O(26), and one O(6) atom to form CoO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra,  a cornercorner with one P(8)O4 tetrahedra,  a cornercorner with one Li(5)O5 trigonal bipyramid, and  a cornercorner with one Li(8)O5 trigonal bipyramid. In the third Co site, Co(3) is bonded to one O(15), one O(27), one O(3), one O(7), and one O(9) atom to form CoO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra,  a cornercorner with one Li(5)O5 trigonal bipyramid,  a cornercorner with one Li(8)O5 trigonal bipyramid, and  an edgeedge with one Li(7)O5 trigonal bipyramid. In the fourth Co site, Co(4) is bonded to one O(1), one O(11), one O(13), one O(25), and one O(5) atom to form CoO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra,  a cornercorner with one P(8)O4 tetrahedra,  a cornercorner with one Li(7)O5 trigonal bipyramid, and  an edgeedge with one Li(5)O5 trigonal bipyramid. There are eight inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(21), one O(5), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one Li(5)O5 trigonal bipyramid, and  an edgeedge with one Li(8)O5 trigonal bipyramid. In the second P site, P(2) is bonded to one O(1), one O(10), one O(22), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one P(6)O4 tetrahedra, and  an edgeedge with one Li(7)O5 trigonal bipyramid. In the third P site, P(3) is bonded to one O(11), one O(23), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one P(7)O4 tetrahedra, and  a cornercorner with one Li(7)O5 trigonal bipyramid. In the fourth P site, P(4) is bonded to one O(12), one O(24), one O(3), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one P(8)O4 tetrahedra,  a cornercorner with one Li(8)O5 trigonal bipyramid, and  an edgeedge with one Li(5)O5 trigonal bipyramid. In the fifth P site, P(5) is bonded to one O(15), one O(17), one O(21), and one O(28) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one Li(5)O5 trigonal bipyramid, and  a cornercorner with one Li(8)O5 trigonal bipyramid. In the sixth P site, P(6) is bonded to one O(16), one O(18), one O(22), and one O(27) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Co(3)O5 square pyramid,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one Li(7)O5 trigonal bipyramid. In the seventh P site, P(7) is bonded to one O(13), one O(19), one O(23), and one O(26) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one Li(7)O5 trigonal bipyramid. In the eighth P site, P(8) is bonded to one O(14), one O(20), one O(24), and one O(25) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O5 square pyramid,  a cornercorner with one Co(4)O5 square pyramid,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one Li(5)O5 trigonal bipyramid, and  a cornercorner with one Li(8)O5 trigonal bipyramid. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Li(7), one Co(4), and one P(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Li(8), one Co(2), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Li(5), one Co(3), and one P(4) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(6), one Co(1), and one P(3) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Li(5), one Co(4), and one P(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Li(6), one Co(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Li(7), one Co(3), and one P(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Li(8), one Co(1), and one P(4) atom. In the ninth O site, O(9) is bonded to one Li(1), one Li(8), one Co(3), and one P(1) atom to form a mixture of corner and edge-sharing OLi2CoP trigonal pyramids. In the tenth O site, O(10) is bonded to one Li(2), one Li(7), one Co(1), and one P(2) atom to form a mixture of corner and edge-sharing OLi2CoP trigonal pyramids. In the eleventh O site, O(11) is bonded to one Li(3), one Li(6), one Co(4), and one P(3) atom to form a mixture of distorted corner and edge-sharing OLi2CoP trigonal pyramids. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Li(4), one Li(5), one Co(2), and one P(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Li(1), one Co(4), and one P(7) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Li(2), one Co(2), and one P(8) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Li(3), one Co(3), and one P(5) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one Li(4), one Co(1), and one P(6) atom. In the seventeenth O site, O(17) is bonded to one Li(1), one Li(4), one Li(5), and one P(5) atom to form OLi3P trigonal pyramids that share  a cornercorner with one O(9)Li2CoP trigonal pyramid and  an edgeedge with one O(20)Li3P trigonal pyramid. In the eighteenth O site, O(18) is bonded to one Li(2), one Li(3), one Li(6), and one P(6) atom to form OLi3P trigonal pyramids that share  a cornercorner with one O(10)Li2CoP trigonal pyramid,  an edgeedge with one O(11)Li2CoP trigonal pyramid, and  an edgeedge with one O(19)Li3P trigonal pyramid. In the nineteenth O site, O(19) is bonded to one Li(2), one Li(3), one Li(7), and one P(7) atom to form OLi3P trigonal pyramids that share  a cornercorner with one O(11)Li2CoP trigonal pyramid,  an edgeedge with one O(10)Li2CoP trigonal pyramid, and  an edgeedge with one O(18)Li3P trigonal pyramid. In the twentieth O site, O(20) is bonded to one Li(1), one Li(4), one Li(8), and one P(8) atom to form OLi3P trigonal pyramids that share  an edgeedge with one O(9)Li2CoP trigonal pyramid and  an edgeedge with one O(17)Li3P trigonal pyramid. In the twenty-first O site, O(21) is bonded in a bent 150 degrees geometry to one P(1) and one P(5) atom. In the twenty-second O site, O(22) is bonded in a bent 150 degrees geometry to one P(2) and one P(6) atom. In the twenty-third O site, O(23) is bonded in a bent 150 degrees geometry to one P(3) and one P(7) atom. In the twenty-fourth O site, O(24) is bonded in a bent 150 degrees geometry to one P(4) and one P(8) atom. In the twenty-fifth O site, O(25) is bonded in a 3-coordinate geometry to one Li(5), one Co(4), and one P(8) atom. In the twenty-sixth O site, O(26) is bonded in a 3-coordinate geometry to one Li(6), one Co(2), and one P(7) atom. In the twenty-seventh O site, O(27) is bonded in a 3-coordinate geometry to one Li(7), one Co(3), and one P(6) atom. In the twenty-eighth O site, O(28) is bonded in a 3-coordinate geometry to one Li(8), one Co(1), and one P(5) atom. is represented by the CIF file [CIF]
data_Li2CoP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.079
_cell_length_b   7.071
_cell_length_c   8.789
_cell_angle_alpha   101.842
_cell_angle_beta   106.513
_cell_angle_gamma   109.565
_symmetry_Int_Tables_number   1
_cell_volume   268.907
_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  0.192  0.174  0.337  1.0
  Co  Co1  1  0.812  0.820  0.666  1.0
  Li  Li2  1  0.912  0.680  0.010  1.0
  Li  Li3  1  0.086  0.317  0.990  1.0
  Li  Li4  1  0.425  0.117  0.753  1.0
  Li  Li5  1  0.565  0.888  0.244  1.0
  O  O6  1  0.464  0.734  0.444  1.0
  O  O7  1  0.538  0.266  0.565  1.0
  O  O8  1  0.099  0.852  0.542  1.0
  O  O9  1  0.891  0.150  0.454  1.0
  O  O10  1  0.116  0.850  0.256  1.0
  O  O11  1  0.900  0.152  0.746  1.0
  O  O12  1  0.636  0.748  0.840  1.0
  O  O13  1  0.365  0.254  0.161  1.0
  O  O14  1  0.690  0.370  0.992  1.0
  O  O15  1  0.309  0.630  0.007  1.0
  O  O16  1  0.906  0.503  0.314  1.0
  O  O17  1  0.097  0.497  0.684  1.0
  O  O18  1  0.214  0.873  0.846  1.0
  O  O19  1  0.781  0.125  0.150  1.0
  P  P20  1  0.155  0.744  0.395  1.0
  P  P21  1  0.847  0.256  0.607  1.0
  P  P22  1  0.672  0.302  0.144  1.0
  P  P23  1  0.328  0.697  0.854  1.0
[/CIF]
.