The crystal structure described by Li2Ni2Si5O13 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 4-coordinate geometry to one O(1), one O(10), one O(12), and one O(13) atom. In the second Li site, Li(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(10), one O(5), and one O(8) atom. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(1), one O(12), one O(7), one O(8), and two equivalent O(2) atoms to form distorted NiO6 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra,  a cornercorner with one Ni(2)O5 trigonal bipyramid,  an edgeedge with one Ni(1)O6 octahedra, and edges with two equivalent Ni(2)O5 trigonal bipyramids. In the second Ni site, Ni(2) is bonded to one O(10), one O(12), one O(2), one O(7), and one O(8) atom to form distorted NiO5 trigonal bipyramids that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and edges with two equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 61°. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Ni(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 60-68°. In the second Si site, Si(2) is bonded to one O(1), one O(11), one O(13), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. In the third Si site, Si(3) is bonded to one O(4), one O(7), one O(8), and one O(9) atom to form SiO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Ni(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 50-62°. In the fourth Si site, Si(4) is bonded to one O(12), one O(13), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Ni(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 55°. In the fifth Si site, Si(5) is bonded to one O(10), one O(11), one O(3), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  a cornercorner with one Ni(2)O5 trigonal bipyramid. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Li(2), one Ni(1), and one Si(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Ni(2), two equivalent Ni(1), and one Si(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(5) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Li(2), one Si(1), and one Si(4) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(5) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ni(1), one Ni(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Li(2), one Ni(1), one Ni(2), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Si(3) and one Si(4) atom. In the tenth O site, O(10) is bonded in a distorted trigonal pyramidal geometry to one Li(1), one Li(2), one Ni(2), and one Si(5) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one Si(2) and one Si(5) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Li(1), one Ni(1), one Ni(2), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Li(1), one Si(2), and one Si(4) atom. is represented by the CIF file [CIF]
data_Li2Si5Ni2O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.537
_cell_length_b   7.656
_cell_length_c   9.779
_cell_angle_alpha   83.583
_cell_angle_beta   111.841
_cell_angle_gamma   108.249
_symmetry_Int_Tables_number   1
_cell_volume   497.443
_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
  Li  Li0  1  0.211  0.929  0.151  1.0
  Li  Li1  1  0.155  0.600  0.260  1.0
  Li  Li2  1  0.845  0.400  0.740  1.0
  Li  Li3  1  0.789  0.071  0.849  1.0
  Si  Si4  1  0.165  0.783  0.743  1.0
  Si  Si5  1  0.208  0.307  0.952  1.0
  Si  Si6  1  0.311  0.546  0.594  1.0
  Si  Si7  1  0.250  0.243  0.269  1.0
  Si  Si8  1  0.620  0.292  0.948  1.0
  Si  Si9  1  0.380  0.708  0.052  1.0
  Si  Si10  1  0.750  0.757  0.731  1.0
  Si  Si11  1  0.689  0.454  0.406  1.0
  Si  Si12  1  0.792  0.693  0.048  1.0
  Si  Si13  1  0.835  0.217  0.257  1.0
  Ni  Ni14  1  0.038  0.856  0.402  1.0
  Ni  Ni15  1  0.413  0.169  0.595  1.0
  Ni  Ni16  1  0.587  0.831  0.405  1.0
  Ni  Ni17  1  0.962  0.144  0.598  1.0
  O  O18  1  0.014  0.224  0.811  1.0
  O  O19  1  0.166  0.953  0.625  1.0
  O  O20  1  0.312  0.849  0.913  1.0
  O  O21  1  0.221  0.611  0.704  1.0
  O  O22  1  0.061  0.316  0.251  1.0
  O  O23  1  0.409  0.321  0.925  1.0
  O  O24  1  0.218  0.323  0.571  1.0
  O  O25  1  0.288  0.685  0.455  1.0
  O  O26  1  0.555  0.578  0.685  1.0
  O  O27  1  0.383  0.785  0.200  1.0
  O  O28  1  0.210  0.506  0.003  1.0
  O  O29  1  0.275  0.072  0.381  1.0
  O  O30  1  0.209  0.173  0.101  1.0
  O  O31  1  0.791  0.827  0.899  1.0
  O  O32  1  0.725  0.928  0.619  1.0
  O  O33  1  0.790  0.494  0.997  1.0
  O  O34  1  0.617  0.215  0.800  1.0
  O  O35  1  0.445  0.422  0.315  1.0
  O  O36  1  0.712  0.315  0.545  1.0
  O  O37  1  0.782  0.677  0.429  1.0
  O  O38  1  0.591  0.679  0.075  1.0
  O  O39  1  0.939  0.684  0.749  1.0
  O  O40  1  0.779  0.389  0.296  1.0
  O  O41  1  0.688  0.151  0.087  1.0
  O  O42  1  0.834  0.047  0.375  1.0
  O  O43  1  0.986  0.776  0.189  1.0
[/CIF]
.
The crystal structure described by Li2Ni2Si5O13 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 4-coordinate geometry to one O(1), one O(10), one O(12), and one O(13) atom. In the second Li site, Li(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(10), one O(5), and one O(8) atom. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(1), one O(12), one O(7), one O(8), and two equivalent O(2) atoms to form distorted NiO6 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra,  a cornercorner with one Ni(2)O5 trigonal bipyramid,  an edgeedge with one Ni(1)O6 octahedra, and edges with two equivalent Ni(2)O5 trigonal bipyramids. In the second Ni site, Ni(2) is bonded to one O(10), one O(12), one O(2), one O(7), and one O(8) atom to form distorted NiO5 trigonal bipyramids that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and edges with two equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 61°. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Ni(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 60-68°. In the second Si site, Si(2) is bonded to one O(1), one O(11), one O(13), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. In the third Si site, Si(3) is bonded to one O(4), one O(7), one O(8), and one O(9) atom to form SiO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Ni(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 50-62°. In the fourth Si site, Si(4) is bonded to one O(12), one O(13), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Ni(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 55°. In the fifth Si site, Si(5) is bonded to one O(10), one O(11), one O(3), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  a cornercorner with one Ni(2)O5 trigonal bipyramid. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Li(2), one Ni(1), and one Si(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Ni(2), two equivalent Ni(1), and one Si(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(5) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Li(2), one Si(1), and one Si(4) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(5) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ni(1), one Ni(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Li(2), one Ni(1), one Ni(2), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Si(3) and one Si(4) atom. In the tenth O site, O(10) is bonded in a distorted trigonal pyramidal geometry to one Li(1), one Li(2), one Ni(2), and one Si(5) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one Si(2) and one Si(5) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Li(1), one Ni(1), one Ni(2), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Li(1), one Si(2), and one Si(4) atom. is represented by the CIF file [CIF]
data_Li2Si5Ni2O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.537
_cell_length_b   7.656
_cell_length_c   9.779
_cell_angle_alpha   83.583
_cell_angle_beta   111.841
_cell_angle_gamma   108.249
_symmetry_Int_Tables_number   1
_cell_volume   497.443
_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
  Li  Li0  1  0.211  0.929  0.151  1.0
  Li  Li1  1  0.155  0.600  0.260  1.0
  Li  Li2  1  0.845  0.400  0.740  1.0
  Li  Li3  1  0.789  0.071  0.849  1.0
  Si  Si4  1  0.165  0.783  0.743  1.0
  Si  Si5  1  0.208  0.307  0.952  1.0
  Si  Si6  1  0.311  0.546  0.594  1.0
  Si  Si7  1  0.250  0.243  0.269  1.0
  Si  Si8  1  0.620  0.292  0.948  1.0
  Si  Si9  1  0.380  0.708  0.052  1.0
  Si  Si10  1  0.750  0.757  0.731  1.0
  Si  Si11  1  0.689  0.454  0.406  1.0
  Si  Si12  1  0.792  0.693  0.048  1.0
  Si  Si13  1  0.835  0.217  0.257  1.0
  Ni  Ni14  1  0.038  0.856  0.402  1.0
  Ni  Ni15  1  0.413  0.169  0.595  1.0
  Ni  Ni16  1  0.587  0.831  0.405  1.0
  Ni  Ni17  1  0.962  0.144  0.598  1.0
  O  O18  1  0.014  0.224  0.811  1.0
  O  O19  1  0.166  0.953  0.625  1.0
  O  O20  1  0.312  0.849  0.913  1.0
  O  O21  1  0.221  0.611  0.704  1.0
  O  O22  1  0.061  0.316  0.251  1.0
  O  O23  1  0.409  0.321  0.925  1.0
  O  O24  1  0.218  0.323  0.571  1.0
  O  O25  1  0.288  0.685  0.455  1.0
  O  O26  1  0.555  0.578  0.685  1.0
  O  O27  1  0.383  0.785  0.200  1.0
  O  O28  1  0.210  0.506  0.003  1.0
  O  O29  1  0.275  0.072  0.381  1.0
  O  O30  1  0.209  0.173  0.101  1.0
  O  O31  1  0.791  0.827  0.899  1.0
  O  O32  1  0.725  0.928  0.619  1.0
  O  O33  1  0.790  0.494  0.997  1.0
  O  O34  1  0.617  0.215  0.800  1.0
  O  O35  1  0.445  0.422  0.315  1.0
  O  O36  1  0.712  0.315  0.545  1.0
  O  O37  1  0.782  0.677  0.429  1.0
  O  O38  1  0.591  0.679  0.075  1.0
  O  O39  1  0.939  0.684  0.749  1.0
  O  O40  1  0.779  0.389  0.296  1.0
  O  O41  1  0.688  0.151  0.087  1.0
  O  O42  1  0.834  0.047  0.375  1.0
  O  O43  1  0.986  0.776  0.189  1.0
[/CIF]
.