The compound described by Li7Si2(NiO4)3 is Caswellsilverite-derived structured and crystallizes in the monoclinic C2 space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form LiO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with three equivalent Si(1)O6 octahedra, and edges with three equivalent Si(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-14°. In the second Li site, Li(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with three equivalent Li(3)O6 octahedra, and edges with three equivalent Li(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-14°. In the third Li site, Li(3) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with three equivalent Li(2)O6 octahedra, and edges with three equivalent Li(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-13°. In the fourth Li site, Li(4) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with three equivalent Li(2)O6 octahedra, and edges with three equivalent Li(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 2-14°. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form NiO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with three equivalent Ni(2)O6 octahedra, and edges with three equivalent Ni(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 2-6°. In the second Ni site, Ni(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form NiO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with three equivalent Ni(1)O6 octahedra, and edges with three equivalent Ni(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-11°. In the third Ni site, Ni(3) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form NiO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with three equivalent Ni(1)O6 octahedra, and edges with three equivalent Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-8°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form SiO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Si(2)O6 octahedra. The corner-sharing octahedral tilt angles are 12°. In the second Si site, Si(2) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form SiO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Si(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-12°. There are six inequivalent O sites. In the first O site, O(5) is bonded to one Li(1), one Li(2), one Li(3), one Li(4), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(3)Li3Ni3 octahedra,  a cornercorner with one O(4)Li3Ni3 octahedra,  a cornercorner with one O(2)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra,  an edgeedge with one O(3)Li3Ni3 octahedra,  an edgeedge with one O(4)Li3Ni3 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra, edges with four equivalent O(2)Li4Si2 octahedra, and edges with four equivalent O(6)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the second O site, O(6) is bonded to one Li(1), one Li(2), one Li(3), one Li(4), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(3)Li3Ni3 octahedra,  a cornercorner with one O(4)Li3Ni3 octahedra,  a cornercorner with one O(2)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra,  an edgeedge with one O(3)Li3Ni3 octahedra,  an edgeedge with one O(4)Li3Ni3 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra, edges with four equivalent O(2)Li4Si2 octahedra, and edges with four equivalent O(5)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the third O site, O(1) is bonded to one Li(2), one Li(3), one Li(4), one Ni(1), one Ni(2), and one Ni(3) atom to form OLi3Ni3 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(3)Li3Ni3 octahedra,  a cornercorner with one O(4)Li3Ni3 octahedra,  a cornercorner with one O(2)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra,  an edgeedge with one O(2)Li4Si2 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra, edges with four equivalent O(3)Li3Ni3 octahedra, and edges with four equivalent O(4)Li3Ni3 octahedra. The corner-sharing octahedral tilt angles range from 2-7°. In the fourth O site, O(2) is bonded to one Li(1), one Li(2), one Li(3), one Li(4), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(3)Li3Ni3 octahedra,  a cornercorner with one O(4)Li3Ni3 octahedra,  a cornercorner with one O(2)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra,  an edgeedge with one O(3)Li3Ni3 octahedra,  an edgeedge with one O(4)Li3Ni3 octahedra,  an edgeedge with one O(2)Li4Si2 octahedra, edges with four equivalent O(5)Li4Si2 octahedra, and edges with four equivalent O(6)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the fifth O site, O(3) is bonded to one Li(2), one Li(3), one Li(4), one Ni(1), one Ni(2), and one Ni(3) atom to form OLi3Ni3 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(3)Li3Ni3 octahedra,  a cornercorner with one O(4)Li3Ni3 octahedra,  a cornercorner with one O(2)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  an edgeedge with one O(3)Li3Ni3 octahedra,  an edgeedge with one O(2)Li4Si2 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra, edges with four equivalent O(1)Li3Ni3 octahedra, and edges with four equivalent O(4)Li3Ni3 octahedra. The corner-sharing octahedral tilt angles range from 3-9°. In the sixth O site, O(4) is bonded to one Li(2), one Li(3), one Li(4), one Ni(1), one Ni(2), and one Ni(3) atom to form OLi3Ni3 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(3)Li3Ni3 octahedra,  a cornercorner with one O(4)Li3Ni3 octahedra,  a cornercorner with one O(2)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  an edgeedge with one O(4)Li3Ni3 octahedra,  an edgeedge with one O(2)Li4Si2 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra, edges with four equivalent O(1)Li3Ni3 octahedra, and edges with four equivalent O(3)Li3Ni3 octahedra. The corner-sharing octahedral tilt angles range from 3-8°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li7Si2(NiO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.876
_cell_length_b   4.897
_cell_length_c   9.706
_cell_angle_alpha   85.154
_cell_angle_beta   99.774
_cell_angle_gamma   119.858
_symmetry_Int_Tables_number   1
_cell_volume   198.055
_cell_formula_units_Z   1
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  0.583  0.666  0.750  1.0
  Li  Li1  1  0.337  0.658  0.997  1.0
  Li  Li2  1  0.820  0.658  0.503  1.0
  Li  Li3  1  0.179  0.342  0.503  1.0
  Li  Li4  1  0.663  0.342  0.997  1.0
  Li  Li5  1  0.507  0.995  0.503  1.0
  Li  Li6  1  0.988  0.995  0.997  1.0
  Si  Si7  1  0.916  0.332  0.750  1.0
  Si  Si8  1  0.250  1.000  0.750  1.0
  Ni  Ni9  1  0.419  0.338  0.250  1.0
  Ni  Ni10  1  0.082  0.665  0.250  1.0
  Ni  Ni11  1  0.753  0.006  0.250  1.0
  O  O12  1  0.462  0.651  0.367  1.0
  O  O13  1  0.689  0.651  0.133  1.0
  O  O14  1  0.176  0.667  0.645  1.0
  O  O15  1  0.991  0.667  0.855  1.0
  O  O16  1  0.064  0.327  0.133  1.0
  O  O17  1  0.762  0.327  0.367  1.0
  O  O18  1  0.403  0.026  0.140  1.0
  O  O19  1  0.123  0.025  0.360  1.0
  O  O20  1  0.246  0.294  0.854  1.0
  O  O21  1  0.919  0.038  0.645  1.0
  O  O22  1  0.619  0.038  0.855  1.0
  O  O23  1  0.548  0.294  0.646  1.0
[/CIF]
.
The compound described by Li7Si2(NiO4)3 is Caswellsilverite-derived structured and crystallizes in the monoclinic C2 space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form LiO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with three equivalent Si(1)O6 octahedra, and edges with three equivalent Si(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-14°. In the second Li site, Li(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with three equivalent Li(3)O6 octahedra, and edges with three equivalent Li(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-14°. In the third Li site, Li(3) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with three equivalent Li(2)O6 octahedra, and edges with three equivalent Li(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-13°. In the fourth Li site, Li(4) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra,  a cornercorner with one Ni(2)O6 octahedra,  a cornercorner with one Ni(3)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra,  an edgeedge with one Ni(2)O6 octahedra,  an edgeedge with one Ni(3)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with three equivalent Li(2)O6 octahedra, and edges with three equivalent Li(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 2-14°. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form NiO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with three equivalent Ni(2)O6 octahedra, and edges with three equivalent Ni(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 2-6°. In the second Ni site, Ni(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form NiO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with three equivalent Ni(1)O6 octahedra, and edges with three equivalent Ni(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-11°. In the third Ni site, Ni(3) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form NiO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with three equivalent Ni(1)O6 octahedra, and edges with three equivalent Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-8°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form SiO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Si(2)O6 octahedra. The corner-sharing octahedral tilt angles are 12°. In the second Si site, Si(2) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form SiO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Si(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-12°. There are six inequivalent O sites. In the first O site, O(5) is bonded to one Li(1), one Li(2), one Li(3), one Li(4), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(3)Li3Ni3 octahedra,  a cornercorner with one O(4)Li3Ni3 octahedra,  a cornercorner with one O(2)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra,  an edgeedge with one O(3)Li3Ni3 octahedra,  an edgeedge with one O(4)Li3Ni3 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra, edges with four equivalent O(2)Li4Si2 octahedra, and edges with four equivalent O(6)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the second O site, O(6) is bonded to one Li(1), one Li(2), one Li(3), one Li(4), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(3)Li3Ni3 octahedra,  a cornercorner with one O(4)Li3Ni3 octahedra,  a cornercorner with one O(2)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra,  an edgeedge with one O(3)Li3Ni3 octahedra,  an edgeedge with one O(4)Li3Ni3 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra, edges with four equivalent O(2)Li4Si2 octahedra, and edges with four equivalent O(5)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the third O site, O(1) is bonded to one Li(2), one Li(3), one Li(4), one Ni(1), one Ni(2), and one Ni(3) atom to form OLi3Ni3 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(3)Li3Ni3 octahedra,  a cornercorner with one O(4)Li3Ni3 octahedra,  a cornercorner with one O(2)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra,  an edgeedge with one O(2)Li4Si2 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra, edges with four equivalent O(3)Li3Ni3 octahedra, and edges with four equivalent O(4)Li3Ni3 octahedra. The corner-sharing octahedral tilt angles range from 2-7°. In the fourth O site, O(2) is bonded to one Li(1), one Li(2), one Li(3), one Li(4), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(3)Li3Ni3 octahedra,  a cornercorner with one O(4)Li3Ni3 octahedra,  a cornercorner with one O(2)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra,  an edgeedge with one O(3)Li3Ni3 octahedra,  an edgeedge with one O(4)Li3Ni3 octahedra,  an edgeedge with one O(2)Li4Si2 octahedra, edges with four equivalent O(5)Li4Si2 octahedra, and edges with four equivalent O(6)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the fifth O site, O(3) is bonded to one Li(2), one Li(3), one Li(4), one Ni(1), one Ni(2), and one Ni(3) atom to form OLi3Ni3 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(3)Li3Ni3 octahedra,  a cornercorner with one O(4)Li3Ni3 octahedra,  a cornercorner with one O(2)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  an edgeedge with one O(3)Li3Ni3 octahedra,  an edgeedge with one O(2)Li4Si2 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra, edges with four equivalent O(1)Li3Ni3 octahedra, and edges with four equivalent O(4)Li3Ni3 octahedra. The corner-sharing octahedral tilt angles range from 3-9°. In the sixth O site, O(4) is bonded to one Li(2), one Li(3), one Li(4), one Ni(1), one Ni(2), and one Ni(3) atom to form OLi3Ni3 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(3)Li3Ni3 octahedra,  a cornercorner with one O(4)Li3Ni3 octahedra,  a cornercorner with one O(2)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  an edgeedge with one O(4)Li3Ni3 octahedra,  an edgeedge with one O(2)Li4Si2 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra, edges with four equivalent O(1)Li3Ni3 octahedra, and edges with four equivalent O(3)Li3Ni3 octahedra. The corner-sharing octahedral tilt angles range from 3-8°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li7Si2(NiO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.876
_cell_length_b   4.897
_cell_length_c   9.706
_cell_angle_alpha   85.154
_cell_angle_beta   99.774
_cell_angle_gamma   119.858
_symmetry_Int_Tables_number   1
_cell_volume   198.055
_cell_formula_units_Z   1
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  0.583  0.666  0.750  1.0
  Li  Li1  1  0.337  0.658  0.997  1.0
  Li  Li2  1  0.820  0.658  0.503  1.0
  Li  Li3  1  0.179  0.342  0.503  1.0
  Li  Li4  1  0.663  0.342  0.997  1.0
  Li  Li5  1  0.507  0.995  0.503  1.0
  Li  Li6  1  0.988  0.995  0.997  1.0
  Si  Si7  1  0.916  0.332  0.750  1.0
  Si  Si8  1  0.250  1.000  0.750  1.0
  Ni  Ni9  1  0.419  0.338  0.250  1.0
  Ni  Ni10  1  0.082  0.665  0.250  1.0
  Ni  Ni11  1  0.753  0.006  0.250  1.0
  O  O12  1  0.462  0.651  0.367  1.0
  O  O13  1  0.689  0.651  0.133  1.0
  O  O14  1  0.176  0.667  0.645  1.0
  O  O15  1  0.991  0.667  0.855  1.0
  O  O16  1  0.064  0.327  0.133  1.0
  O  O17  1  0.762  0.327  0.367  1.0
  O  O18  1  0.403  0.026  0.140  1.0
  O  O19  1  0.123  0.025  0.360  1.0
  O  O20  1  0.246  0.294  0.854  1.0
  O  O21  1  0.919  0.038  0.645  1.0
  O  O22  1  0.619  0.038  0.855  1.0
  O  O23  1  0.548  0.294  0.646  1.0
[/CIF]
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