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 5-coordinate geometry to one O(17), one O(20), one O(24), one O(4), and one O(5) atom. In the second Li site, Li(2) is bonded in a 5-coordinate geometry to one O(18), one O(19), one O(23), one O(3), and one O(6) atom. In the third Li site, Li(3) is bonded to one O(17), one O(20), one O(3), and one O(7) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(4)O6 octahedra,  a cornercorner with one P(6)O4 tetrahedra, corners with two equivalent P(5)O4 tetrahedra, and corners with two equivalent P(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 65-76°. In the fourth Li site, Li(4) is bonded to one O(18), one O(19), one O(4), and one O(8) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(5)O4 tetrahedra, corners with two equivalent P(6)O4 tetrahedra, and corners with two equivalent P(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 65-75°. In the fifth Li site, Li(5) is bonded in a 4-coordinate geometry to one O(1), one O(14), one O(15), and one O(9) atom. In the sixth Li site, Li(6) is bonded in a 5-coordinate geometry to one O(10), one O(13), one O(16), one O(2), and one O(28) atom. In the seventh Li site, Li(7) is bonded to one O(11), one O(14), one O(15), and one O(2) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 65-76°. In the eighth Li site, Li(8) is bonded to one O(1), one O(12), one O(13), and one O(16) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 65-76°. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(12), one O(16), one O(17), one O(24), one O(25), and one O(5) atom to form CoO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(8)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(7)O4 tetrahedra,  a cornercorner with one Li(3)O4 trigonal pyramid, and corners with two equivalent Li(8)O4 trigonal pyramids. In the second Co site, Co(2) is bonded to one O(14), one O(19), one O(22), one O(27), one O(8), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, corners with two equivalent P(5)O4 tetrahedra,  a cornercorner with one Li(7)O4 trigonal pyramid, and corners with two equivalent Li(4)O4 trigonal pyramids. In the third Co site, Co(3) is bonded to one O(11), one O(15), one O(18), one O(23), one O(26), and one O(6) atom to form CoO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(8)O4 tetrahedra,  a cornercorner with one Li(4)O4 trigonal pyramid, and corners with two equivalent Li(7)O4 trigonal pyramids. In the fourth Co site, Co(4) is bonded to one O(10), one O(13), one O(20), one O(21), one O(28), and one O(7) atom to form CoO6 octahedra that share  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with two equivalent P(6)O4 tetrahedra,  a cornercorner with one Li(8)O4 trigonal pyramid, and corners with two equivalent Li(3)O4 trigonal pyramids. There are eight inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(12), one O(15), and one O(23) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one Li(7)O4 trigonal pyramid, and corners with two equivalent Li(8)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 26-71°. In the second P site, P(2) is bonded to one O(11), one O(16), one O(2), and one O(24) atom to form PO4 tetrahedra that share  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one Li(8)O4 trigonal pyramid, and corners with two equivalent Li(7)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 27-70°. In the third P site, P(3) is bonded to one O(1), one O(13), one O(21), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Co(4)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with two equivalent Li(8)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 17-71°. In the fourth P site, P(4) is bonded to one O(10), one O(14), one O(2), and one O(22) atom to form PO4 tetrahedra that share  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with two equivalent Li(7)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 17-71°. In the fifth P site, P(5) is bonded to one O(19), one O(27), one O(3), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(7)O4 tetrahedra,  a cornercorner with one Li(4)O4 trigonal pyramid, and corners with two equivalent Li(3)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 27-71°. In the sixth P site, P(6) is bonded to one O(20), one O(28), one O(4), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Co(4)O6 octahedra,  a cornercorner with one P(8)O4 tetrahedra,  a cornercorner with one Li(3)O4 trigonal pyramid, and corners with two equivalent Li(4)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 27-71°. In the seventh P site, P(7) is bonded to one O(17), one O(25), one O(3), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  a cornercorner with one P(5)O4 tetrahedra, and corners with two equivalent Li(3)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 17-70°. In the eighth P site, P(8) is bonded to one O(18), one O(26), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  a cornercorner with one P(6)O4 tetrahedra, and corners with two equivalent Li(4)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 17-70°. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded to one Li(5), one Li(8), one P(1), and one P(3) atom to form distorted corner-sharing OLi2P2 tetrahedra. In the second O site, O(2) is bonded to one Li(6), one Li(7), one P(2), and one P(4) atom to form distorted corner-sharing OLi2P2 trigonal pyramids. In the third O site, O(3) is bonded to one Li(2), one Li(3), one P(5), and one P(7) atom to form distorted corner-sharing OLi2P2 trigonal pyramids. In the fourth O site, O(4) is bonded to one Li(1), one Li(4), one P(6), and one P(8) atom to form distorted corner-sharing OLi2P2 trigonal pyramids. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Li(1), one Co(1), and one P(8) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Li(2), one Co(3), and one P(7) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Li(3), one Co(4), and one P(5) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Li(4), one Co(2), and one P(6) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Li(5), one Co(2), and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Li(6), one Co(4), and one P(4) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Li(7), one Co(3), and one P(2) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Li(8), one Co(1), and one P(1) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Li(6), one Li(8), one Co(4), and one P(3) atom. In the fourteenth O site, O(14) is bonded to one Li(5), one Li(7), one Co(2), and one P(4) atom to form distorted OLi2CoP tetrahedra that share  a cornercorner with one O(19)Li2CoP tetrahedra,  a cornercorner with one O(1)Li2P2 tetrahedra, corners with two equivalent O(15)Li2CoP tetrahedra, and corners with two equivalent O(2)Li2P2 trigonal pyramids. In the fifteenth O site, O(15) is bonded to one Li(5), one Li(7), one Co(3), and one P(1) atom to form distorted OLi2CoP tetrahedra that share corners with two equivalent O(14)Li2CoP tetrahedra, corners with two equivalent O(1)Li2P2 tetrahedra, and  a cornercorner with one O(2)Li2P2 trigonal pyramid. In the sixteenth O site, O(16) is bonded to one Li(6), one Li(8), one Co(1), and one P(2) atom to form distorted corner-sharing OLi2CoP tetrahedra. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Li(1), one Li(3), one Co(1), and one P(7) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Li(2), one Li(4), one Co(3), and one P(8) atom. In the nineteenth O site, O(19) is bonded to one Li(2), one Li(4), one Co(2), and one P(5) atom to form distorted OLi2CoP tetrahedra that share  a cornercorner with one O(14)Li2CoP tetrahedra,  a cornercorner with one O(4)Li2P2 trigonal pyramid, and corners with two equivalent O(3)Li2P2 trigonal pyramids. In the twentieth O site, O(20) is bonded to one Li(1), one Li(3), one Co(4), and one P(6) atom to form distorted corner-sharing OLi2CoP tetrahedra. In the twenty-first O site, O(21) is bonded in a distorted linear geometry to one Co(4) and one P(3) atom. In the twenty-second O site, O(22) is bonded in a distorted linear geometry to one Co(2) and one P(4) atom. In the twenty-third O site, O(23) is bonded in a 3-coordinate geometry to one Li(2), one Co(3), and one P(1) atom. In the twenty-fourth O site, O(24) is bonded in a 3-coordinate geometry to one Li(1), one Co(1), and one P(2) atom. In the twenty-fifth O site, O(25) is bonded in a distorted linear geometry to one Co(1) and one P(7) atom. In the twenty-sixth O site, O(26) is bonded in a distorted linear geometry to one Co(3) and one P(8) atom. In the twenty-seventh O site, O(27) is bonded in a bent 150 degrees geometry to one Co(2) and one P(5) atom. In the twenty-eighth O site, O(28) is bonded in a distorted bent 150 degrees geometry to one Li(6), one Co(4), and one P(6) atom. is represented by the CIF card [CIF]
data_Li2CoP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.816
_cell_length_b   5.199
_cell_length_c   11.793
_cell_angle_alpha   94.626
_cell_angle_beta   90.016
_cell_angle_gamma   117.547
_symmetry_Int_Tables_number   1
_cell_volume   260.701
_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  0.498  0.499  0.997  1.0
  Co  Co1  1  0.997  0.496  0.497  1.0
  Li  Li2  1  0.918  0.293  0.161  1.0
  Li  Li3  1  0.602  0.696  0.308  1.0
  Li  Li4  1  0.382  0.297  0.670  1.0
  Li  Li5  1  0.092  0.693  0.806  1.0
  O  O6  1  0.893  0.001  0.753  1.0
  O  O7  1  0.109  0.004  0.253  1.0
  O  O8  1  0.496  0.176  0.098  1.0
  O  O9  1  0.333  0.824  0.402  1.0
  O  O10  1  0.677  0.176  0.599  1.0
  O  O11  1  0.488  0.823  0.902  1.0
  O  O12  1  0.331  0.669  0.663  1.0
  O  O13  1  0.666  0.335  0.840  1.0
  O  O14  1  0.336  0.670  0.163  1.0
  O  O15  1  0.667  0.337  0.341  1.0
  O  O16  1  0.815  0.753  0.557  1.0
  O  O17  1  0.046  0.237  0.954  1.0
  O  O18  1  0.933  0.756  0.059  1.0
  O  O19  1  0.186  0.236  0.454  1.0
  P  P20  1  0.765  0.106  0.872  1.0
  P  P21  1  0.663  0.893  0.633  1.0
  P  P22  1  0.339  0.107  0.373  1.0
  P  P23  1  0.227  0.894  0.133  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 5-coordinate geometry to one O(17), one O(20), one O(24), one O(4), and one O(5) atom. In the second Li site, Li(2) is bonded in a 5-coordinate geometry to one O(18), one O(19), one O(23), one O(3), and one O(6) atom. In the third Li site, Li(3) is bonded to one O(17), one O(20), one O(3), and one O(7) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(4)O6 octahedra,  a cornercorner with one P(6)O4 tetrahedra, corners with two equivalent P(5)O4 tetrahedra, and corners with two equivalent P(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 65-76°. In the fourth Li site, Li(4) is bonded to one O(18), one O(19), one O(4), and one O(8) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(5)O4 tetrahedra, corners with two equivalent P(6)O4 tetrahedra, and corners with two equivalent P(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 65-75°. In the fifth Li site, Li(5) is bonded in a 4-coordinate geometry to one O(1), one O(14), one O(15), and one O(9) atom. In the sixth Li site, Li(6) is bonded in a 5-coordinate geometry to one O(10), one O(13), one O(16), one O(2), and one O(28) atom. In the seventh Li site, Li(7) is bonded to one O(11), one O(14), one O(15), and one O(2) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 65-76°. In the eighth Li site, Li(8) is bonded to one O(1), one O(12), one O(13), and one O(16) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 65-76°. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(12), one O(16), one O(17), one O(24), one O(25), and one O(5) atom to form CoO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(8)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(7)O4 tetrahedra,  a cornercorner with one Li(3)O4 trigonal pyramid, and corners with two equivalent Li(8)O4 trigonal pyramids. In the second Co site, Co(2) is bonded to one O(14), one O(19), one O(22), one O(27), one O(8), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, corners with two equivalent P(5)O4 tetrahedra,  a cornercorner with one Li(7)O4 trigonal pyramid, and corners with two equivalent Li(4)O4 trigonal pyramids. In the third Co site, Co(3) is bonded to one O(11), one O(15), one O(18), one O(23), one O(26), and one O(6) atom to form CoO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(8)O4 tetrahedra,  a cornercorner with one Li(4)O4 trigonal pyramid, and corners with two equivalent Li(7)O4 trigonal pyramids. In the fourth Co site, Co(4) is bonded to one O(10), one O(13), one O(20), one O(21), one O(28), and one O(7) atom to form CoO6 octahedra that share  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with two equivalent P(6)O4 tetrahedra,  a cornercorner with one Li(8)O4 trigonal pyramid, and corners with two equivalent Li(3)O4 trigonal pyramids. There are eight inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(12), one O(15), and one O(23) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one Li(7)O4 trigonal pyramid, and corners with two equivalent Li(8)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 26-71°. In the second P site, P(2) is bonded to one O(11), one O(16), one O(2), and one O(24) atom to form PO4 tetrahedra that share  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one Li(8)O4 trigonal pyramid, and corners with two equivalent Li(7)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 27-70°. In the third P site, P(3) is bonded to one O(1), one O(13), one O(21), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Co(4)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with two equivalent Li(8)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 17-71°. In the fourth P site, P(4) is bonded to one O(10), one O(14), one O(2), and one O(22) atom to form PO4 tetrahedra that share  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with two equivalent Li(7)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 17-71°. In the fifth P site, P(5) is bonded to one O(19), one O(27), one O(3), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Co(4)O6 octahedra, corners with two equivalent Co(2)O6 octahedra,  a cornercorner with one P(7)O4 tetrahedra,  a cornercorner with one Li(4)O4 trigonal pyramid, and corners with two equivalent Li(3)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 27-71°. In the sixth P site, P(6) is bonded to one O(20), one O(28), one O(4), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Co(4)O6 octahedra,  a cornercorner with one P(8)O4 tetrahedra,  a cornercorner with one Li(3)O4 trigonal pyramid, and corners with two equivalent Li(4)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 27-71°. In the seventh P site, P(7) is bonded to one O(17), one O(25), one O(3), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra,  a cornercorner with one P(5)O4 tetrahedra, and corners with two equivalent Li(3)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 17-70°. In the eighth P site, P(8) is bonded to one O(18), one O(26), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(3)O6 octahedra,  a cornercorner with one P(6)O4 tetrahedra, and corners with two equivalent Li(4)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 17-70°. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded to one Li(5), one Li(8), one P(1), and one P(3) atom to form distorted corner-sharing OLi2P2 tetrahedra. In the second O site, O(2) is bonded to one Li(6), one Li(7), one P(2), and one P(4) atom to form distorted corner-sharing OLi2P2 trigonal pyramids. In the third O site, O(3) is bonded to one Li(2), one Li(3), one P(5), and one P(7) atom to form distorted corner-sharing OLi2P2 trigonal pyramids. In the fourth O site, O(4) is bonded to one Li(1), one Li(4), one P(6), and one P(8) atom to form distorted corner-sharing OLi2P2 trigonal pyramids. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Li(1), one Co(1), and one P(8) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Li(2), one Co(3), and one P(7) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Li(3), one Co(4), and one P(5) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Li(4), one Co(2), and one P(6) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Li(5), one Co(2), and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Li(6), one Co(4), and one P(4) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Li(7), one Co(3), and one P(2) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Li(8), one Co(1), and one P(1) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Li(6), one Li(8), one Co(4), and one P(3) atom. In the fourteenth O site, O(14) is bonded to one Li(5), one Li(7), one Co(2), and one P(4) atom to form distorted OLi2CoP tetrahedra that share  a cornercorner with one O(19)Li2CoP tetrahedra,  a cornercorner with one O(1)Li2P2 tetrahedra, corners with two equivalent O(15)Li2CoP tetrahedra, and corners with two equivalent O(2)Li2P2 trigonal pyramids. In the fifteenth O site, O(15) is bonded to one Li(5), one Li(7), one Co(3), and one P(1) atom to form distorted OLi2CoP tetrahedra that share corners with two equivalent O(14)Li2CoP tetrahedra, corners with two equivalent O(1)Li2P2 tetrahedra, and  a cornercorner with one O(2)Li2P2 trigonal pyramid. In the sixteenth O site, O(16) is bonded to one Li(6), one Li(8), one Co(1), and one P(2) atom to form distorted corner-sharing OLi2CoP tetrahedra. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Li(1), one Li(3), one Co(1), and one P(7) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Li(2), one Li(4), one Co(3), and one P(8) atom. In the nineteenth O site, O(19) is bonded to one Li(2), one Li(4), one Co(2), and one P(5) atom to form distorted OLi2CoP tetrahedra that share  a cornercorner with one O(14)Li2CoP tetrahedra,  a cornercorner with one O(4)Li2P2 trigonal pyramid, and corners with two equivalent O(3)Li2P2 trigonal pyramids. In the twentieth O site, O(20) is bonded to one Li(1), one Li(3), one Co(4), and one P(6) atom to form distorted corner-sharing OLi2CoP tetrahedra. In the twenty-first O site, O(21) is bonded in a distorted linear geometry to one Co(4) and one P(3) atom. In the twenty-second O site, O(22) is bonded in a distorted linear geometry to one Co(2) and one P(4) atom. In the twenty-third O site, O(23) is bonded in a 3-coordinate geometry to one Li(2), one Co(3), and one P(1) atom. In the twenty-fourth O site, O(24) is bonded in a 3-coordinate geometry to one Li(1), one Co(1), and one P(2) atom. In the twenty-fifth O site, O(25) is bonded in a distorted linear geometry to one Co(1) and one P(7) atom. In the twenty-sixth O site, O(26) is bonded in a distorted linear geometry to one Co(3) and one P(8) atom. In the twenty-seventh O site, O(27) is bonded in a bent 150 degrees geometry to one Co(2) and one P(5) atom. In the twenty-eighth O site, O(28) is bonded in a distorted bent 150 degrees geometry to one Li(6), one Co(4), and one P(6) atom. is represented by the CIF card [CIF]
data_Li2CoP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.816
_cell_length_b   5.199
_cell_length_c   11.793
_cell_angle_alpha   94.626
_cell_angle_beta   90.016
_cell_angle_gamma   117.547
_symmetry_Int_Tables_number   1
_cell_volume   260.701
_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  0.498  0.499  0.997  1.0
  Co  Co1  1  0.997  0.496  0.497  1.0
  Li  Li2  1  0.918  0.293  0.161  1.0
  Li  Li3  1  0.602  0.696  0.308  1.0
  Li  Li4  1  0.382  0.297  0.670  1.0
  Li  Li5  1  0.092  0.693  0.806  1.0
  O  O6  1  0.893  0.001  0.753  1.0
  O  O7  1  0.109  0.004  0.253  1.0
  O  O8  1  0.496  0.176  0.098  1.0
  O  O9  1  0.333  0.824  0.402  1.0
  O  O10  1  0.677  0.176  0.599  1.0
  O  O11  1  0.488  0.823  0.902  1.0
  O  O12  1  0.331  0.669  0.663  1.0
  O  O13  1  0.666  0.335  0.840  1.0
  O  O14  1  0.336  0.670  0.163  1.0
  O  O15  1  0.667  0.337  0.341  1.0
  O  O16  1  0.815  0.753  0.557  1.0
  O  O17  1  0.046  0.237  0.954  1.0
  O  O18  1  0.933  0.756  0.059  1.0
  O  O19  1  0.186  0.236  0.454  1.0
  P  P20  1  0.765  0.106  0.872  1.0
  P  P21  1  0.663  0.893  0.633  1.0
  P  P22  1  0.339  0.107  0.373  1.0
  P  P23  1  0.227  0.894  0.133  1.0
[/CIF]
.