The crystal structure described by Li2NiSiO4 is beta beryllia-derived structured and crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form LiO4 tetrahedra that share corners with two equivalent Ni(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form LiO4 tetrahedra that share corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Ni(1)O4 tetrahedra, and corners with four equivalent Si(1)O4 tetrahedra. Ni(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form NiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Ni(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, and corners with four equivalent Ni(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Li(2), two equivalent Li(1), and one Si(1) atom to form OLi3Si tetrahedra that share corners with four equivalent O(2)Li2SiNi tetrahedra, corners with four equivalent O(3)Li2SiNi tetrahedra, corners with two equivalent O(4)LiSiNi2 trigonal pyramids, and  an edgeedge with one O(1)Li3Si tetrahedra. In the second O site, O(2) is bonded to one Li(1), one Li(2), one Ni(1), and one Si(1) atom to form OLi2SiNi tetrahedra that share corners with four equivalent O(3)Li2SiNi tetrahedra, corners with four equivalent O(1)Li3Si tetrahedra, and corners with four equivalent O(4)LiSiNi2 trigonal pyramids. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Ni(1), and one Si(1) atom to form OLi2SiNi tetrahedra that share corners with four equivalent O(2)Li2SiNi tetrahedra, corners with four equivalent O(1)Li3Si tetrahedra, and corners with four equivalent O(4)LiSiNi2 trigonal pyramids. In the fourth O site, O(4) is bonded to one Li(2), two equivalent Ni(1), and one Si(1) atom to form distorted OLiSiNi2 trigonal pyramids that share corners with two equivalent O(1)Li3Si tetrahedra, corners with four equivalent O(2)Li2SiNi tetrahedra, corners with four equivalent O(3)Li2SiNi tetrahedra, and  an edgeedge with one O(4)LiSiNi2 trigonal pyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2SiNiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.976
_cell_length_b   6.361
_cell_length_c   10.862
_cell_angle_alpha   88.304
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   343.719
_cell_formula_units_Z   4
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  0.193  0.507  0.585  1.0
  Li  Li1  1  0.307  0.507  0.085  1.0
  Li  Li2  1  0.196  0.263  0.828  1.0
  Li  Li3  1  0.304  0.263  0.328  1.0
  Li  Li4  1  0.696  0.737  0.672  1.0
  Li  Li5  1  0.804  0.737  0.172  1.0
  Li  Li6  1  0.693  0.493  0.915  1.0
  Li  Li7  1  0.807  0.493  0.415  1.0
  Si  Si8  1  0.693  0.262  0.666  1.0
  Si  Si9  1  0.807  0.262  0.166  1.0
  Si  Si10  1  0.193  0.738  0.834  1.0
  Si  Si11  1  0.307  0.738  0.334  1.0
  Ni  Ni12  1  0.210  0.005  0.590  1.0
  Ni  Ni13  1  0.290  0.005  0.090  1.0
  Ni  Ni14  1  0.710  0.995  0.910  1.0
  Ni  Ni15  1  0.790  0.995  0.410  1.0
  O  O16  1  0.797  0.474  0.597  1.0
  O  O17  1  0.703  0.474  0.097  1.0
  O  O18  1  0.360  0.250  0.665  1.0
  O  O19  1  0.140  0.250  0.165  1.0
  O  O20  1  0.796  0.247  0.812  1.0
  O  O21  1  0.704  0.247  0.312  1.0
  O  O22  1  0.805  0.046  0.594  1.0
  O  O23  1  0.695  0.046  0.094  1.0
  O  O24  1  0.305  0.954  0.906  1.0
  O  O25  1  0.195  0.954  0.406  1.0
  O  O26  1  0.860  0.750  0.835  1.0
  O  O27  1  0.640  0.750  0.335  1.0
  O  O28  1  0.296  0.753  0.688  1.0
  O  O29  1  0.204  0.753  0.188  1.0
  O  O30  1  0.297  0.526  0.903  1.0
  O  O31  1  0.203  0.526  0.403  1.0
[/CIF]
.
The crystal structure described by Li2NiSiO4 is beta beryllia-derived structured and crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form LiO4 tetrahedra that share corners with two equivalent Ni(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form LiO4 tetrahedra that share corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Ni(1)O4 tetrahedra, and corners with four equivalent Si(1)O4 tetrahedra. Ni(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form NiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Ni(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, and corners with four equivalent Ni(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Li(2), two equivalent Li(1), and one Si(1) atom to form OLi3Si tetrahedra that share corners with four equivalent O(2)Li2SiNi tetrahedra, corners with four equivalent O(3)Li2SiNi tetrahedra, corners with two equivalent O(4)LiSiNi2 trigonal pyramids, and  an edgeedge with one O(1)Li3Si tetrahedra. In the second O site, O(2) is bonded to one Li(1), one Li(2), one Ni(1), and one Si(1) atom to form OLi2SiNi tetrahedra that share corners with four equivalent O(3)Li2SiNi tetrahedra, corners with four equivalent O(1)Li3Si tetrahedra, and corners with four equivalent O(4)LiSiNi2 trigonal pyramids. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Ni(1), and one Si(1) atom to form OLi2SiNi tetrahedra that share corners with four equivalent O(2)Li2SiNi tetrahedra, corners with four equivalent O(1)Li3Si tetrahedra, and corners with four equivalent O(4)LiSiNi2 trigonal pyramids. In the fourth O site, O(4) is bonded to one Li(2), two equivalent Ni(1), and one Si(1) atom to form distorted OLiSiNi2 trigonal pyramids that share corners with two equivalent O(1)Li3Si tetrahedra, corners with four equivalent O(2)Li2SiNi tetrahedra, corners with four equivalent O(3)Li2SiNi tetrahedra, and  an edgeedge with one O(4)LiSiNi2 trigonal pyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2SiNiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.976
_cell_length_b   6.361
_cell_length_c   10.862
_cell_angle_alpha   88.304
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   343.719
_cell_formula_units_Z   4
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  0.193  0.507  0.585  1.0
  Li  Li1  1  0.307  0.507  0.085  1.0
  Li  Li2  1  0.196  0.263  0.828  1.0
  Li  Li3  1  0.304  0.263  0.328  1.0
  Li  Li4  1  0.696  0.737  0.672  1.0
  Li  Li5  1  0.804  0.737  0.172  1.0
  Li  Li6  1  0.693  0.493  0.915  1.0
  Li  Li7  1  0.807  0.493  0.415  1.0
  Si  Si8  1  0.693  0.262  0.666  1.0
  Si  Si9  1  0.807  0.262  0.166  1.0
  Si  Si10  1  0.193  0.738  0.834  1.0
  Si  Si11  1  0.307  0.738  0.334  1.0
  Ni  Ni12  1  0.210  0.005  0.590  1.0
  Ni  Ni13  1  0.290  0.005  0.090  1.0
  Ni  Ni14  1  0.710  0.995  0.910  1.0
  Ni  Ni15  1  0.790  0.995  0.410  1.0
  O  O16  1  0.797  0.474  0.597  1.0
  O  O17  1  0.703  0.474  0.097  1.0
  O  O18  1  0.360  0.250  0.665  1.0
  O  O19  1  0.140  0.250  0.165  1.0
  O  O20  1  0.796  0.247  0.812  1.0
  O  O21  1  0.704  0.247  0.312  1.0
  O  O22  1  0.805  0.046  0.594  1.0
  O  O23  1  0.695  0.046  0.094  1.0
  O  O24  1  0.305  0.954  0.906  1.0
  O  O25  1  0.195  0.954  0.406  1.0
  O  O26  1  0.860  0.750  0.835  1.0
  O  O27  1  0.640  0.750  0.335  1.0
  O  O28  1  0.296  0.753  0.688  1.0
  O  O29  1  0.204  0.753  0.188  1.0
  O  O30  1  0.297  0.526  0.903  1.0
  O  O31  1  0.203  0.526  0.403  1.0
[/CIF]
.