The material 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(1), one O(2), one O(3), and one O(4) atom to form LiO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with four equivalent Ni(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(2)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 two equivalent Li(1)O4 tetrahedra, corners with two equivalent Ni(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra,  an edgeedge with one Li(1)O4 tetrahedra, and  an edgeedge with one Ni(1)O4 tetrahedra. Ni(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form NiO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(2)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(1), one Li(2), one Ni(1), and one Si(1) atom to form a mixture of distorted edge and corner-sharing OLi2SiNi 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 a mixture of distorted edge and corner-sharing OLi2SiNi tetrahedra. 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 a mixture of distorted edge and corner-sharing OLi2SiNi trigonal pyramids. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Ni(1), and one Si(1) atom to form corner-sharing OLi2SiNi tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2SiNiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.710
_cell_length_b   5.051
_cell_length_c   8.016
_cell_angle_alpha   52.513
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   344.057
_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  0.663  0.687  0.505  1.0
  Li  Li1  1  0.422  0.464  0.741  1.0
  Li  Li2  1  0.922  0.536  0.759  1.0
  Li  Li3  1  0.163  0.313  0.995  1.0
  Li  Li4  1  0.837  0.687  0.005  1.0
  Li  Li5  1  0.078  0.464  0.241  1.0
  Li  Li6  1  0.578  0.536  0.259  1.0
  Li  Li7  1  0.337  0.313  0.495  1.0
  Si  Si8  1  0.086  0.065  0.746  1.0
  Si  Si9  1  0.586  0.935  0.754  1.0
  Si  Si10  1  0.414  0.065  0.246  1.0
  Si  Si11  1  0.914  0.935  0.254  1.0
  Ni  Ni12  1  0.836  0.194  0.500  1.0
  Ni  Ni13  1  0.336  0.806  1.000  1.0
  Ni  Ni14  1  0.664  0.194  0.000  1.0
  Ni  Ni15  1  0.164  0.806  0.500  1.0
  O  O16  1  0.160  0.174  0.530  1.0
  O  O17  1  0.661  0.248  0.544  1.0
  O  O18  1  0.442  0.054  0.746  1.0
  O  O19  1  0.087  0.390  0.747  1.0
  O  O20  1  0.587  0.610  0.753  1.0
  O  O21  1  0.942  0.946  0.754  1.0
  O  O22  1  0.161  0.752  0.956  1.0
  O  O23  1  0.660  0.826  0.970  1.0
  O  O24  1  0.340  0.174  0.030  1.0
  O  O25  1  0.839  0.248  0.044  1.0
  O  O26  1  0.058  0.054  0.246  1.0
  O  O27  1  0.413  0.390  0.247  1.0
  O  O28  1  0.913  0.610  0.253  1.0
  O  O29  1  0.558  0.946  0.254  1.0
  O  O30  1  0.339  0.752  0.456  1.0
  O  O31  1  0.840  0.826  0.470  1.0
[/CIF]
.
The material 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(1), one O(2), one O(3), and one O(4) atom to form LiO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with four equivalent Ni(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(2)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 two equivalent Li(1)O4 tetrahedra, corners with two equivalent Ni(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra,  an edgeedge with one Li(1)O4 tetrahedra, and  an edgeedge with one Ni(1)O4 tetrahedra. Ni(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form NiO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(2)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(1), one Li(2), one Ni(1), and one Si(1) atom to form a mixture of distorted edge and corner-sharing OLi2SiNi 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 a mixture of distorted edge and corner-sharing OLi2SiNi tetrahedra. 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 a mixture of distorted edge and corner-sharing OLi2SiNi trigonal pyramids. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Ni(1), and one Si(1) atom to form corner-sharing OLi2SiNi tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2SiNiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.710
_cell_length_b   5.051
_cell_length_c   8.016
_cell_angle_alpha   52.513
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   344.057
_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  0.663  0.687  0.505  1.0
  Li  Li1  1  0.422  0.464  0.741  1.0
  Li  Li2  1  0.922  0.536  0.759  1.0
  Li  Li3  1  0.163  0.313  0.995  1.0
  Li  Li4  1  0.837  0.687  0.005  1.0
  Li  Li5  1  0.078  0.464  0.241  1.0
  Li  Li6  1  0.578  0.536  0.259  1.0
  Li  Li7  1  0.337  0.313  0.495  1.0
  Si  Si8  1  0.086  0.065  0.746  1.0
  Si  Si9  1  0.586  0.935  0.754  1.0
  Si  Si10  1  0.414  0.065  0.246  1.0
  Si  Si11  1  0.914  0.935  0.254  1.0
  Ni  Ni12  1  0.836  0.194  0.500  1.0
  Ni  Ni13  1  0.336  0.806  1.000  1.0
  Ni  Ni14  1  0.664  0.194  0.000  1.0
  Ni  Ni15  1  0.164  0.806  0.500  1.0
  O  O16  1  0.160  0.174  0.530  1.0
  O  O17  1  0.661  0.248  0.544  1.0
  O  O18  1  0.442  0.054  0.746  1.0
  O  O19  1  0.087  0.390  0.747  1.0
  O  O20  1  0.587  0.610  0.753  1.0
  O  O21  1  0.942  0.946  0.754  1.0
  O  O22  1  0.161  0.752  0.956  1.0
  O  O23  1  0.660  0.826  0.970  1.0
  O  O24  1  0.340  0.174  0.030  1.0
  O  O25  1  0.839  0.248  0.044  1.0
  O  O26  1  0.058  0.054  0.246  1.0
  O  O27  1  0.413  0.390  0.247  1.0
  O  O28  1  0.913  0.610  0.253  1.0
  O  O29  1  0.558  0.946  0.254  1.0
  O  O30  1  0.339  0.752  0.456  1.0
  O  O31  1  0.840  0.826  0.470  1.0
[/CIF]
.