The structure described by Li7Si2(NiO4)3 is Caswellsilverite-derived structured and crystallizes in the monoclinic C2/m space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form LiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra, corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Si(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, edges with two equivalent Ni(2)O6 octahedra, edges with two equivalent Si(1)O6 octahedra, and edges with six equivalent Li(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-14°. In the second Li site, Li(2) is bonded to two equivalent O(4) and four equivalent O(3) atoms to form LiO6 octahedra that share corners with two equivalent Li(1)O6 octahedra, corners with four equivalent Li(3)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with four equivalent Li(3)O6 octahedra, and edges with six equivalent Si(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. In the third Li site, Li(3) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form LiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra, corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Si(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, edges with two equivalent Ni(2)O6 octahedra, edges with two equivalent Si(1)O6 octahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Li(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form NiO6 octahedra that share corners with two equivalent Li(1)O6 octahedra, corners with four equivalent Li(3)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with four equivalent Li(3)O6 octahedra, and edges with six equivalent Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-9°. In the second Ni site, Ni(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form NiO6 octahedra that share corners with two equivalent Li(1)O6 octahedra, corners with four equivalent Li(3)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with three equivalent Ni(1)O6 octahedra, edges with three equivalent Ni(2)O6 octahedra, and edges with four equivalent Li(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-7°. Si(1) is bonded to two equivalent O(4) and four equivalent O(3) atoms to form SiO6 octahedra that share corners with two equivalent Li(1)O6 octahedra, corners with four equivalent Li(3)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with three equivalent Li(2)O6 octahedra, edges with three equivalent Si(1)O6 octahedra, and edges with four equivalent Li(3)O6 octahedra. The corner-sharing octahedral tilt angles are 12°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), two equivalent Li(3), one Ni(1), and two equivalent Ni(2) atoms to form OLi3Ni3 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra, corners with two equivalent O(2)Li3Ni3 octahedra, corners with two equivalent O(3)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra, edges with two equivalent O(3)Li4Si2 octahedra, and edges with eight equivalent O(2)Li3Ni3 octahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the second O site, O(2) is bonded to one Li(1), two equivalent Li(3), one Ni(1), and two equivalent Ni(2) atoms to form OLi3Ni3 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra, corners with two equivalent O(2)Li3Ni3 octahedra, corners with two equivalent O(3)Li4Si2 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra, edges with two equivalent O(3)Li4Si2 octahedra, edges with four equivalent O(1)Li3Ni3 octahedra, and edges with five equivalent O(2)Li3Ni3 octahedra. The corner-sharing octahedral tilt angles range from 0-8°. In the third O site, O(3) is bonded to one Li(1), one Li(2), two equivalent Li(3), and two equivalent Si(1) atoms to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra, corners with two equivalent O(2)Li3Ni3 octahedra, corners with two equivalent O(3)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra, edges with two equivalent O(2)Li3Ni3 octahedra, edges with four equivalent O(4)Li4Si2 octahedra, and edges with five equivalent O(3)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), two equivalent Li(3), and two equivalent Si(1) atoms to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra, corners with two equivalent O(2)Li3Ni3 octahedra, corners with two equivalent O(3)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra, edges with two equivalent O(2)Li3Ni3 octahedra, and edges with eight equivalent O(3)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. is represented by the CIF file [CIF]
data_Li7Si2(NiO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.875
_cell_length_b   4.892
_cell_length_c   9.741
_cell_angle_alpha   94.966
_cell_angle_beta   100.003
_cell_angle_gamma   60.112
_symmetry_Int_Tables_number   1
_cell_volume   198.337
_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  0.674  0.667  0.997  1.0
  Li  Li1  1  0.917  0.667  0.750  1.0
  Li  Li2  1  0.837  0.341  0.504  1.0
  Li  Li3  1  0.322  0.341  0.996  1.0
  Li  Li4  1  0.159  0.667  0.503  1.0
  Li  Li5  1  0.512  0.992  0.504  1.0
  Li  Li6  1  0.996  0.992  0.996  1.0
  Si  Si7  1  0.583  0.333  0.750  1.0
  Si  Si8  1  0.250  0.000  0.750  1.0
  Ni  Ni9  1  0.417  0.667  0.250  1.0
  Ni  Ni10  1  0.750  0.001  0.250  1.0
  Ni  Ni11  1  0.084  0.333  0.250  1.0
  O  O12  1  0.800  0.666  0.369  1.0
  O  O13  1  0.734  0.323  0.136  1.0
  O  O14  1  0.953  0.294  0.854  1.0
  O  O15  1  0.509  0.667  0.646  1.0
  O  O16  1  0.880  0.039  0.646  1.0
  O  O17  1  0.443  0.323  0.364  1.0
  O  O18  1  0.325  0.667  0.854  1.0
  O  O19  1  0.033  0.666  0.131  1.0
  O  O20  1  0.580  0.039  0.854  1.0
  O  O21  1  0.390  0.011  0.137  1.0
  O  O22  1  0.253  0.294  0.646  1.0
  O  O23  1  0.099  0.011  0.363  1.0
[/CIF]
.
The structure described by Li7Si2(NiO4)3 is Caswellsilverite-derived structured and crystallizes in the monoclinic C2/m space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form LiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra, corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Si(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, edges with two equivalent Ni(2)O6 octahedra, edges with two equivalent Si(1)O6 octahedra, and edges with six equivalent Li(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-14°. In the second Li site, Li(2) is bonded to two equivalent O(4) and four equivalent O(3) atoms to form LiO6 octahedra that share corners with two equivalent Li(1)O6 octahedra, corners with four equivalent Li(3)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with four equivalent Li(3)O6 octahedra, and edges with six equivalent Si(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. In the third Li site, Li(3) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form LiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Ni(1)O6 octahedra, corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Si(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, edges with two equivalent Ni(2)O6 octahedra, edges with two equivalent Si(1)O6 octahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Li(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form NiO6 octahedra that share corners with two equivalent Li(1)O6 octahedra, corners with four equivalent Li(3)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with four equivalent Li(3)O6 octahedra, and edges with six equivalent Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-9°. In the second Ni site, Ni(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form NiO6 octahedra that share corners with two equivalent Li(1)O6 octahedra, corners with four equivalent Li(3)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with three equivalent Ni(1)O6 octahedra, edges with three equivalent Ni(2)O6 octahedra, and edges with four equivalent Li(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-7°. Si(1) is bonded to two equivalent O(4) and four equivalent O(3) atoms to form SiO6 octahedra that share corners with two equivalent Li(1)O6 octahedra, corners with four equivalent Li(3)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with three equivalent Li(2)O6 octahedra, edges with three equivalent Si(1)O6 octahedra, and edges with four equivalent Li(3)O6 octahedra. The corner-sharing octahedral tilt angles are 12°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), two equivalent Li(3), one Ni(1), and two equivalent Ni(2) atoms to form OLi3Ni3 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra, corners with two equivalent O(2)Li3Ni3 octahedra, corners with two equivalent O(3)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra, edges with two equivalent O(3)Li4Si2 octahedra, and edges with eight equivalent O(2)Li3Ni3 octahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the second O site, O(2) is bonded to one Li(1), two equivalent Li(3), one Ni(1), and two equivalent Ni(2) atoms to form OLi3Ni3 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra, corners with two equivalent O(2)Li3Ni3 octahedra, corners with two equivalent O(3)Li4Si2 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra, edges with two equivalent O(3)Li4Si2 octahedra, edges with four equivalent O(1)Li3Ni3 octahedra, and edges with five equivalent O(2)Li3Ni3 octahedra. The corner-sharing octahedral tilt angles range from 0-8°. In the third O site, O(3) is bonded to one Li(1), one Li(2), two equivalent Li(3), and two equivalent Si(1) atoms to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra, corners with two equivalent O(2)Li3Ni3 octahedra, corners with two equivalent O(3)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra, edges with two equivalent O(2)Li3Ni3 octahedra, edges with four equivalent O(4)Li4Si2 octahedra, and edges with five equivalent O(3)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), two equivalent Li(3), and two equivalent Si(1) atoms to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Ni3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra, corners with two equivalent O(2)Li3Ni3 octahedra, corners with two equivalent O(3)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Ni3 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra, edges with two equivalent O(2)Li3Ni3 octahedra, and edges with eight equivalent O(3)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. is represented by the CIF file [CIF]
data_Li7Si2(NiO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.875
_cell_length_b   4.892
_cell_length_c   9.741
_cell_angle_alpha   94.966
_cell_angle_beta   100.003
_cell_angle_gamma   60.112
_symmetry_Int_Tables_number   1
_cell_volume   198.337
_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  0.674  0.667  0.997  1.0
  Li  Li1  1  0.917  0.667  0.750  1.0
  Li  Li2  1  0.837  0.341  0.504  1.0
  Li  Li3  1  0.322  0.341  0.996  1.0
  Li  Li4  1  0.159  0.667  0.503  1.0
  Li  Li5  1  0.512  0.992  0.504  1.0
  Li  Li6  1  0.996  0.992  0.996  1.0
  Si  Si7  1  0.583  0.333  0.750  1.0
  Si  Si8  1  0.250  0.000  0.750  1.0
  Ni  Ni9  1  0.417  0.667  0.250  1.0
  Ni  Ni10  1  0.750  0.001  0.250  1.0
  Ni  Ni11  1  0.084  0.333  0.250  1.0
  O  O12  1  0.800  0.666  0.369  1.0
  O  O13  1  0.734  0.323  0.136  1.0
  O  O14  1  0.953  0.294  0.854  1.0
  O  O15  1  0.509  0.667  0.646  1.0
  O  O16  1  0.880  0.039  0.646  1.0
  O  O17  1  0.443  0.323  0.364  1.0
  O  O18  1  0.325  0.667  0.854  1.0
  O  O19  1  0.033  0.666  0.131  1.0
  O  O20  1  0.580  0.039  0.854  1.0
  O  O21  1  0.390  0.011  0.137  1.0
  O  O22  1  0.253  0.294  0.646  1.0
  O  O23  1  0.099  0.011  0.363  1.0
[/CIF]
.