The material described by Li2Ni5Si5O16 crystallizes in the triclinic P1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(13), one O(6), one O(8), and one O(9) atom. In the second Li site, Li(2) is bonded to one O(14), one O(15), one O(2), and one O(5) atom to form LiO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Ni(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(1), one O(11), one O(16), and one O(3) atom to form NiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with two equivalent Ni(5)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. In the second Ni site, Ni(2) is bonded to one O(10), one O(11), one O(3), and one O(7) atom to form NiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Ni(1)O4 tetrahedra, corners with two equivalent Ni(3)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. In the third Ni site, Ni(3) is bonded to one O(10), one O(12), one O(4), and one O(7) atom to form NiO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with two equivalent Ni(5)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the fourth Ni site, Ni(4) is bonded to one O(14), one O(5), one O(8), and one O(9) atom to form NiO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. In the fifth Ni site, Ni(5) is bonded to one O(1), one O(12), one O(16), and one O(4) atom to form NiO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Ni(1)O4 tetrahedra, corners with two equivalent Ni(3)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(15), one O(2), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Si(5)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Ni(3)O4 tetrahedra, and corners with two equivalent Ni(5)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Ni(4)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(10), one O(11), one O(14), and one O(16) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra,  a cornercorner with one Ni(5)O4 tetrahedra, corners with two equivalent Ni(1)O4 tetrahedra, and corners with two equivalent Ni(2)O4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(12), one O(13), one O(15), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra,  a cornercorner with one Ni(5)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Ni(1), one Ni(5), and one Si(2) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(2), one Si(1), and one Si(3) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Ni(1), one Ni(2), and one Si(3) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Ni(3), one Ni(5), and one Si(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Li(2), one Ni(4), and one Si(3) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Li(1), one Si(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Ni(2), one Ni(3), and one Si(2) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Li(1), one Ni(4), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Ni(4), and one Si(5) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Ni(2), one Ni(3), and one Si(4) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Ni(1), one Ni(2), and one Si(4) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Ni(3), one Ni(5), and one Si(5) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one Li(1), one Si(1), and one Si(5) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Li(2), one Ni(4), and one Si(4) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal non-coplanar geometry to one Li(2), one Si(1), and one Si(5) atom. In the sixteenth O site, O(16) is bonded in a trigonal non-coplanar geometry to one Ni(1), one Ni(5), and one Si(4) atom. is represented by the CIF card [CIF]
data_Li2Si5Ni5O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.926
_cell_length_b   7.008
_cell_length_c   10.063
_cell_angle_alpha   89.237
_cell_angle_beta   89.968
_cell_angle_gamma   89.951
_symmetry_Int_Tables_number   1
_cell_volume   347.319
_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  0.340  0.503  0.338  1.0
  Li  Li1  1  0.817  0.997  0.143  1.0
  Si  Si2  1  0.304  0.988  0.336  1.0
  Si  Si3  1  0.180  0.766  0.593  1.0
  Si  Si4  1  0.333  0.741  0.099  1.0
  Si  Si5  1  0.685  0.259  0.909  1.0
  Si  Si6  1  0.797  0.233  0.407  1.0
  Ni  Ni7  1  0.192  0.013  0.856  1.0
  Ni  Ni8  1  0.196  0.516  0.847  1.0
  Ni  Ni9  1  0.697  0.498  0.644  1.0
  Ni  Ni10  1  0.817  0.496  0.152  1.0
  Ni  Ni11  1  0.690  1.000  0.662  1.0
  O  O12  1  0.293  0.953  0.670  1.0
  O  O13  1  0.213  0.933  0.185  1.0
  O  O14  1  0.230  0.763  0.944  1.0
  O  O15  1  0.850  0.754  0.606  1.0
  O  O16  1  0.658  0.751  0.117  1.0
  O  O17  1  0.265  0.796  0.432  1.0
  O  O18  1  0.303  0.566  0.652  1.0
  O  O19  1  0.209  0.549  0.165  1.0
  O  O20  1  0.724  0.435  0.340  1.0
  O  O21  1  0.805  0.450  0.831  1.0
  O  O22  1  0.354  0.264  0.882  1.0
  O  O23  1  0.735  0.242  0.565  1.0
  O  O24  1  0.121  0.172  0.381  1.0
  O  O25  1  0.771  0.249  0.064  1.0
  O  O26  1  0.624  0.053  0.340  1.0
  O  O27  1  0.797  0.061  0.841  1.0
[/CIF]
.
The material described by Li2Ni5Si5O16 crystallizes in the triclinic P1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(13), one O(6), one O(8), and one O(9) atom. In the second Li site, Li(2) is bonded to one O(14), one O(15), one O(2), and one O(5) atom to form LiO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Ni(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(1), one O(11), one O(16), and one O(3) atom to form NiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with two equivalent Ni(5)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. In the second Ni site, Ni(2) is bonded to one O(10), one O(11), one O(3), and one O(7) atom to form NiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Ni(1)O4 tetrahedra, corners with two equivalent Ni(3)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. In the third Ni site, Ni(3) is bonded to one O(10), one O(12), one O(4), and one O(7) atom to form NiO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Ni(2)O4 tetrahedra, corners with two equivalent Ni(5)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the fourth Ni site, Ni(4) is bonded to one O(14), one O(5), one O(8), and one O(9) atom to form NiO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. In the fifth Ni site, Ni(5) is bonded to one O(1), one O(12), one O(16), and one O(4) atom to form NiO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Ni(1)O4 tetrahedra, corners with two equivalent Ni(3)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(15), one O(2), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Si(5)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Ni(3)O4 tetrahedra, and corners with two equivalent Ni(5)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Ni(1)O4 tetrahedra,  a cornercorner with one Ni(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Ni(4)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(10), one O(11), one O(14), and one O(16) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra,  a cornercorner with one Ni(5)O4 tetrahedra, corners with two equivalent Ni(1)O4 tetrahedra, and corners with two equivalent Ni(2)O4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(12), one O(13), one O(15), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Ni(3)O4 tetrahedra,  a cornercorner with one Ni(4)O4 tetrahedra,  a cornercorner with one Ni(5)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Ni(1), one Ni(5), and one Si(2) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(2), one Si(1), and one Si(3) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Ni(1), one Ni(2), and one Si(3) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Ni(3), one Ni(5), and one Si(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Li(2), one Ni(4), and one Si(3) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Li(1), one Si(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Ni(2), one Ni(3), and one Si(2) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Li(1), one Ni(4), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Ni(4), and one Si(5) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Ni(2), one Ni(3), and one Si(4) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Ni(1), one Ni(2), and one Si(4) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Ni(3), one Ni(5), and one Si(5) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one Li(1), one Si(1), and one Si(5) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Li(2), one Ni(4), and one Si(4) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal non-coplanar geometry to one Li(2), one Si(1), and one Si(5) atom. In the sixteenth O site, O(16) is bonded in a trigonal non-coplanar geometry to one Ni(1), one Ni(5), and one Si(4) atom. is represented by the CIF card [CIF]
data_Li2Si5Ni5O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.926
_cell_length_b   7.008
_cell_length_c   10.063
_cell_angle_alpha   89.237
_cell_angle_beta   89.968
_cell_angle_gamma   89.951
_symmetry_Int_Tables_number   1
_cell_volume   347.319
_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  0.340  0.503  0.338  1.0
  Li  Li1  1  0.817  0.997  0.143  1.0
  Si  Si2  1  0.304  0.988  0.336  1.0
  Si  Si3  1  0.180  0.766  0.593  1.0
  Si  Si4  1  0.333  0.741  0.099  1.0
  Si  Si5  1  0.685  0.259  0.909  1.0
  Si  Si6  1  0.797  0.233  0.407  1.0
  Ni  Ni7  1  0.192  0.013  0.856  1.0
  Ni  Ni8  1  0.196  0.516  0.847  1.0
  Ni  Ni9  1  0.697  0.498  0.644  1.0
  Ni  Ni10  1  0.817  0.496  0.152  1.0
  Ni  Ni11  1  0.690  1.000  0.662  1.0
  O  O12  1  0.293  0.953  0.670  1.0
  O  O13  1  0.213  0.933  0.185  1.0
  O  O14  1  0.230  0.763  0.944  1.0
  O  O15  1  0.850  0.754  0.606  1.0
  O  O16  1  0.658  0.751  0.117  1.0
  O  O17  1  0.265  0.796  0.432  1.0
  O  O18  1  0.303  0.566  0.652  1.0
  O  O19  1  0.209  0.549  0.165  1.0
  O  O20  1  0.724  0.435  0.340  1.0
  O  O21  1  0.805  0.450  0.831  1.0
  O  O22  1  0.354  0.264  0.882  1.0
  O  O23  1  0.735  0.242  0.565  1.0
  O  O24  1  0.121  0.172  0.381  1.0
  O  O25  1  0.771  0.249  0.064  1.0
  O  O26  1  0.624  0.053  0.340  1.0
  O  O27  1  0.797  0.061  0.841  1.0
[/CIF]
.