The crystal structure described by Li2NiSi2O6 crystallizes in the triclinic P1 space group. There are eight inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(10), one O(12), one O(19), and one O(8) atom to form LiO4 tetrahedra that share  a cornercorner with one Ni(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, and corners with two equivalent Ni(4)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(11), one O(20), one O(7), and one O(9) atom to form LiO4 tetrahedra that share  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, and corners with two equivalent Ni(2)O4 tetrahedra. In the third Li site, Li(3) is bonded to one O(10), one O(12), one O(17), and one O(5) atom to form LiO4 tetrahedra that share  a cornercorner with one Ni(4)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, and corners with two equivalent Ni(3)O4 tetrahedra. In the fourth Li site, Li(4) is bonded to one O(11), one O(18), one O(6), and one O(9) atom to form LiO4 tetrahedra that share  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Ni(1)O4 tetrahedra. In the fifth Li site, Li(5) is bonded to one O(14), one O(15), one O(24), and one O(3) atom to form LiO4 tetrahedra that share  a cornercorner with one Li(7)O4 tetrahedra,  a cornercorner with one Li(8)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(6)O4 tetrahedra, and corners with two equivalent Si(7)O4 tetrahedra. In the sixth Li site, Li(6) is bonded to one O(13), one O(16), one O(23), and one O(4) atom to form LiO4 tetrahedra that share  a cornercorner with one Li(7)O4 tetrahedra,  a cornercorner with one Li(8)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(5)O4 tetrahedra, and corners with two equivalent Si(8)O4 tetrahedra. In the seventh Li site, Li(7) is bonded to one O(1), one O(13), one O(15), and one O(21) atom to form LiO4 tetrahedra that share  a cornercorner with one Li(5)O4 tetrahedra,  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(5)O4 tetrahedra, and corners with two equivalent Si(7)O4 tetrahedra. In the eighth Li site, Li(8) is bonded to one O(14), one O(16), one O(2), and one O(22) atom to form LiO4 tetrahedra that share  a cornercorner with one Li(5)O4 tetrahedra,  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(6)O4 tetrahedra, and corners with two equivalent Si(8)O4 tetrahedra. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(11), one O(14), one O(4), and one O(6) atom to form NiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(5)O4 tetrahedra,  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Li(8)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, and corners with two equivalent Si(6)O4 tetrahedra. In the second Ni site, Ni(2) is bonded to one O(15), one O(2), one O(7), and one O(9) atom to form NiO4 tetrahedra that share  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Li(5)O4 tetrahedra,  a cornercorner with one Li(7)O4 tetrahedra,  a cornercorner with one Li(8)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Si(7)O4 tetrahedra. In the third Ni site, Ni(3) is bonded to one O(12), one O(13), one O(3), and one O(5) atom to form NiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(5)O4 tetrahedra,  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Li(7)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, and corners with two equivalent Si(5)O4 tetrahedra. In the fourth Ni site, Ni(4) is bonded to one O(1), one O(10), one O(16), and one O(8) atom to form NiO4 tetrahedra that share  a cornercorner with one Li(3)O4 tetrahedra,  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Li(7)O4 tetrahedra,  a cornercorner with one Li(8)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, and corners with two equivalent Si(8)O4 tetrahedra. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(17), one O(19), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra,  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Li(7)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(10), one O(18), one O(2), and one O(20) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra,  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Li(8)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(11), one O(17), one O(19), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra,  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Li(5)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(12), one O(18), one O(20), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra,  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(13), one O(21), one O(23), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(3)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, corners with two equivalent Li(6)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, and corners with two equivalent Ni(3)O4 tetrahedra. In the sixth Si site, Si(6) is bonded to one O(14), one O(22), one O(24), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Li(8)O4 tetrahedra, and corners with two equivalent Ni(1)O4 tetrahedra. In the seventh Si site, Si(7) is bonded to one O(15), one O(21), one O(24), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, and corners with two equivalent Ni(2)O4 tetrahedra. In the eighth Si site, Si(8) is bonded to one O(16), one O(22), one O(23), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, corners with two equivalent Li(6)O4 tetrahedra, corners with two equivalent Li(8)O4 tetrahedra, and corners with two equivalent Ni(4)O4 tetrahedra. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(7), one Ni(4), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(8), one Ni(2), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(5), one Ni(3), and one Si(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(6), one Ni(1), and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Li(3), one Ni(3), and one Si(5) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Li(4), one Ni(1), and one Si(6) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Li(2), one Ni(2), and one Si(7) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Li(1), one Ni(4), and one Si(8) atom. In the ninth O site, O(9) is bonded to one Li(2), one Li(4), one Ni(2), and one Si(1) atom to form corner-sharing OLi2SiNi tetrahedra. In the tenth O site, O(10) is bonded to one Li(1), one Li(3), one Ni(4), and one Si(2) atom to form corner-sharing OLi2SiNi tetrahedra. In the eleventh O site, O(11) is bonded to one Li(2), one Li(4), one Ni(1), and one Si(3) atom to form corner-sharing OLi2SiNi tetrahedra. In the twelfth O site, O(12) is bonded to one Li(1), one Li(3), one Ni(3), and one Si(4) atom to form corner-sharing OLi2SiNi tetrahedra. In the thirteenth O site, O(13) is bonded to one Li(6), one Li(7), one Ni(3), and one Si(5) atom to form corner-sharing OLi2SiNi tetrahedra. In the fourteenth O site, O(14) is bonded to one Li(5), one Li(8), one Ni(1), and one Si(6) atom to form corner-sharing OLi2SiNi tetrahedra. In the fifteenth O site, O(15) is bonded to one Li(5), one Li(7), one Ni(2), and one Si(7) atom to form corner-sharing OLi2SiNi tetrahedra. In the sixteenth O site, O(16) is bonded to one Li(6), one Li(8), one Ni(4), and one Si(8) atom to form corner-sharing OLi2SiNi tetrahedra. In the seventeenth O site, O(17) is bonded in a trigonal planar geometry to one Li(3), one Si(1), and one Si(3) atom. In the eighteenth O site, O(18) is bonded in a trigonal planar geometry to one Li(4), one Si(2), and one Si(4) atom. In the nineteenth O site, O(19) is bonded in a trigonal planar geometry to one Li(1), one Si(1), and one Si(3) atom. In the twentieth O site, O(20) is bonded in a trigonal planar geometry to one Li(2), one Si(2), and one Si(4) atom. In the twenty-first O site, O(21) is bonded in a trigonal planar geometry to one Li(7), one Si(5), and one Si(7) atom. In the twenty-second O site, O(22) is bonded in a trigonal planar geometry to one Li(8), one Si(6), and one Si(8) atom. In the twenty-third O site, O(23) is bonded in a trigonal planar geometry to one Li(6), one Si(5), and one Si(8) atom. In the twenty-fourth O site, O(24) is bonded in a trigonal planar geometry to one Li(5), one Si(6), and one Si(7) atom. is represented by the CIF card [CIF]
data_Li2Si2NiO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.089
_cell_length_b   5.089
_cell_length_c   10.526
_cell_angle_alpha   103.884
_cell_angle_beta   103.901
_cell_angle_gamma   90.381
_symmetry_Int_Tables_number   1
_cell_volume   256.274
_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  0.376  0.933  0.837  1.0
  Li  Li1  1  0.789  0.847  0.665  1.0
  Li  Li2  1  0.155  0.212  0.337  1.0
  Li  Li3  1  0.069  0.626  0.165  1.0
  Ni  Ni4  1  0.228  0.773  0.501  1.0
  Ni  Ni5  1  0.979  0.023  0.001  1.0
  O  O6  1  0.029  0.395  0.984  1.0
  O  O7  1  0.296  0.162  0.518  1.0
  O  O8  1  0.840  0.705  0.484  1.0
  O  O9  1  0.607  0.972  0.018  1.0
  O  O10  1  0.014  0.761  0.831  1.0
  O  O11  1  0.434  0.681  0.671  1.0
  O  O12  1  0.321  0.567  0.331  1.0
  O  O13  1  0.241  0.988  0.171  1.0
  O  O14  1  0.738  0.266  0.724  1.0
  O  O15  1  0.265  0.293  0.778  1.0
  O  O16  1  0.709  0.736  0.224  1.0
  O  O17  1  0.736  0.263  0.278  1.0
  Si  Si18  1  0.011  0.442  0.836  1.0
  Si  Si19  1  0.426  0.357  0.666  1.0
  Si  Si20  1  0.644  0.575  0.336  1.0
  Si  Si21  1  0.560  0.990  0.166  1.0
[/CIF]
.
The crystal structure described by Li2NiSi2O6 crystallizes in the triclinic P1 space group. There are eight inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(10), one O(12), one O(19), and one O(8) atom to form LiO4 tetrahedra that share  a cornercorner with one Ni(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, and corners with two equivalent Ni(4)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(11), one O(20), one O(7), and one O(9) atom to form LiO4 tetrahedra that share  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, and corners with two equivalent Ni(2)O4 tetrahedra. In the third Li site, Li(3) is bonded to one O(10), one O(12), one O(17), and one O(5) atom to form LiO4 tetrahedra that share  a cornercorner with one Ni(4)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, and corners with two equivalent Ni(3)O4 tetrahedra. In the fourth Li site, Li(4) is bonded to one O(11), one O(18), one O(6), and one O(9) atom to form LiO4 tetrahedra that share  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Ni(1)O4 tetrahedra. In the fifth Li site, Li(5) is bonded to one O(14), one O(15), one O(24), and one O(3) atom to form LiO4 tetrahedra that share  a cornercorner with one Li(7)O4 tetrahedra,  a cornercorner with one Li(8)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(6)O4 tetrahedra, and corners with two equivalent Si(7)O4 tetrahedra. In the sixth Li site, Li(6) is bonded to one O(13), one O(16), one O(23), and one O(4) atom to form LiO4 tetrahedra that share  a cornercorner with one Li(7)O4 tetrahedra,  a cornercorner with one Li(8)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(5)O4 tetrahedra, and corners with two equivalent Si(8)O4 tetrahedra. In the seventh Li site, Li(7) is bonded to one O(1), one O(13), one O(15), and one O(21) atom to form LiO4 tetrahedra that share  a cornercorner with one Li(5)O4 tetrahedra,  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(5)O4 tetrahedra, and corners with two equivalent Si(7)O4 tetrahedra. In the eighth Li site, Li(8) is bonded to one O(14), one O(16), one O(2), and one O(22) atom to form LiO4 tetrahedra that share  a cornercorner with one Li(5)O4 tetrahedra,  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(6)O4 tetrahedra, and corners with two equivalent Si(8)O4 tetrahedra. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(11), one O(14), one O(4), and one O(6) atom to form NiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(5)O4 tetrahedra,  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Li(8)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, and corners with two equivalent Si(6)O4 tetrahedra. In the second Ni site, Ni(2) is bonded to one O(15), one O(2), one O(7), and one O(9) atom to form NiO4 tetrahedra that share  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Li(5)O4 tetrahedra,  a cornercorner with one Li(7)O4 tetrahedra,  a cornercorner with one Li(8)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Si(7)O4 tetrahedra. In the third Ni site, Ni(3) is bonded to one O(12), one O(13), one O(3), and one O(5) atom to form NiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(5)O4 tetrahedra,  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Li(7)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, and corners with two equivalent Si(5)O4 tetrahedra. In the fourth Ni site, Ni(4) is bonded to one O(1), one O(10), one O(16), and one O(8) atom to form NiO4 tetrahedra that share  a cornercorner with one Li(3)O4 tetrahedra,  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Li(7)O4 tetrahedra,  a cornercorner with one Li(8)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, and corners with two equivalent Si(8)O4 tetrahedra. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(17), one O(19), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra,  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Li(7)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(10), one O(18), one O(2), and one O(20) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra,  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Li(8)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(11), one O(17), one O(19), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra,  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Li(5)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(12), one O(18), one O(20), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra,  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(13), one O(21), one O(23), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(3)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, corners with two equivalent Li(6)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, and corners with two equivalent Ni(3)O4 tetrahedra. In the sixth Si site, Si(6) is bonded to one O(14), one O(22), one O(24), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Li(8)O4 tetrahedra, and corners with two equivalent Ni(1)O4 tetrahedra. In the seventh Si site, Si(7) is bonded to one O(15), one O(21), one O(24), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, and corners with two equivalent Ni(2)O4 tetrahedra. In the eighth Si site, Si(8) is bonded to one O(16), one O(22), one O(23), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, corners with two equivalent Li(6)O4 tetrahedra, corners with two equivalent Li(8)O4 tetrahedra, and corners with two equivalent Ni(4)O4 tetrahedra. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(7), one Ni(4), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(8), one Ni(2), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(5), one Ni(3), and one Si(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(6), one Ni(1), and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Li(3), one Ni(3), and one Si(5) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Li(4), one Ni(1), and one Si(6) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Li(2), one Ni(2), and one Si(7) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Li(1), one Ni(4), and one Si(8) atom. In the ninth O site, O(9) is bonded to one Li(2), one Li(4), one Ni(2), and one Si(1) atom to form corner-sharing OLi2SiNi tetrahedra. In the tenth O site, O(10) is bonded to one Li(1), one Li(3), one Ni(4), and one Si(2) atom to form corner-sharing OLi2SiNi tetrahedra. In the eleventh O site, O(11) is bonded to one Li(2), one Li(4), one Ni(1), and one Si(3) atom to form corner-sharing OLi2SiNi tetrahedra. In the twelfth O site, O(12) is bonded to one Li(1), one Li(3), one Ni(3), and one Si(4) atom to form corner-sharing OLi2SiNi tetrahedra. In the thirteenth O site, O(13) is bonded to one Li(6), one Li(7), one Ni(3), and one Si(5) atom to form corner-sharing OLi2SiNi tetrahedra. In the fourteenth O site, O(14) is bonded to one Li(5), one Li(8), one Ni(1), and one Si(6) atom to form corner-sharing OLi2SiNi tetrahedra. In the fifteenth O site, O(15) is bonded to one Li(5), one Li(7), one Ni(2), and one Si(7) atom to form corner-sharing OLi2SiNi tetrahedra. In the sixteenth O site, O(16) is bonded to one Li(6), one Li(8), one Ni(4), and one Si(8) atom to form corner-sharing OLi2SiNi tetrahedra. In the seventeenth O site, O(17) is bonded in a trigonal planar geometry to one Li(3), one Si(1), and one Si(3) atom. In the eighteenth O site, O(18) is bonded in a trigonal planar geometry to one Li(4), one Si(2), and one Si(4) atom. In the nineteenth O site, O(19) is bonded in a trigonal planar geometry to one Li(1), one Si(1), and one Si(3) atom. In the twentieth O site, O(20) is bonded in a trigonal planar geometry to one Li(2), one Si(2), and one Si(4) atom. In the twenty-first O site, O(21) is bonded in a trigonal planar geometry to one Li(7), one Si(5), and one Si(7) atom. In the twenty-second O site, O(22) is bonded in a trigonal planar geometry to one Li(8), one Si(6), and one Si(8) atom. In the twenty-third O site, O(23) is bonded in a trigonal planar geometry to one Li(6), one Si(5), and one Si(8) atom. In the twenty-fourth O site, O(24) is bonded in a trigonal planar geometry to one Li(5), one Si(6), and one Si(7) atom. is represented by the CIF card [CIF]
data_Li2Si2NiO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.089
_cell_length_b   5.089
_cell_length_c   10.526
_cell_angle_alpha   103.884
_cell_angle_beta   103.901
_cell_angle_gamma   90.381
_symmetry_Int_Tables_number   1
_cell_volume   256.274
_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  0.376  0.933  0.837  1.0
  Li  Li1  1  0.789  0.847  0.665  1.0
  Li  Li2  1  0.155  0.212  0.337  1.0
  Li  Li3  1  0.069  0.626  0.165  1.0
  Ni  Ni4  1  0.228  0.773  0.501  1.0
  Ni  Ni5  1  0.979  0.023  0.001  1.0
  O  O6  1  0.029  0.395  0.984  1.0
  O  O7  1  0.296  0.162  0.518  1.0
  O  O8  1  0.840  0.705  0.484  1.0
  O  O9  1  0.607  0.972  0.018  1.0
  O  O10  1  0.014  0.761  0.831  1.0
  O  O11  1  0.434  0.681  0.671  1.0
  O  O12  1  0.321  0.567  0.331  1.0
  O  O13  1  0.241  0.988  0.171  1.0
  O  O14  1  0.738  0.266  0.724  1.0
  O  O15  1  0.265  0.293  0.778  1.0
  O  O16  1  0.709  0.736  0.224  1.0
  O  O17  1  0.736  0.263  0.278  1.0
  Si  Si18  1  0.011  0.442  0.836  1.0
  Si  Si19  1  0.426  0.357  0.666  1.0
  Si  Si20  1  0.644  0.575  0.336  1.0
  Si  Si21  1  0.560  0.990  0.166  1.0
[/CIF]
.