The structure described by TbNi10Si2 crystallizes in the orthorhombic Immm space group. Tb(1) is bonded in a 20-coordinate geometry to two equivalent Ni(4), four equivalent Ni(1), four equivalent Ni(2), eight equivalent Ni(3), and two equivalent Si(1) atoms. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Tb(1), two equivalent Ni(2), two equivalent Ni(4), four equivalent Ni(3), and two equivalent Si(1) atoms to form a mixture of distorted corner, face, and edge-sharing NiTb2Si2Ni8 cuboctahedra. In the second Ni site, Ni(2) is bonded to two equivalent Tb(1), two equivalent Ni(1), two equivalent Ni(4), four equivalent Ni(3), and two equivalent Si(1) atoms to form a mixture of distorted corner, face, and edge-sharing NiTb2Si2Ni8 cuboctahedra. In the third Ni site, Ni(3) is bonded to two equivalent Tb(1), two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), and two equivalent Si(1) atoms to form a mixture of corner, face, and edge-sharing NiTb2Si2Ni8 cuboctahedra. In the fourth Ni site, Ni(4) is bonded in a 10-coordinate geometry to one Tb(1), one Ni(4), two equivalent Ni(1), two equivalent Ni(2), and four equivalent Ni(3) atoms. Si(1) is bonded in a 10-coordinate geometry to one Tb(1), two equivalent Ni(1), two equivalent Ni(2), four equivalent Ni(3), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Tb(SiNi5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.266
_cell_length_b   6.266
_cell_length_c   6.266
_cell_angle_alpha   135.542
_cell_angle_beta   100.123
_cell_angle_gamma   96.343
_symmetry_Int_Tables_number   1
_cell_volume   159.412
_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
  Tb  Tb0  1  0.000  0.000  0.000  1.0
  Si  Si1  1  0.655  0.655  0.000  1.0
  Si  Si2  1  0.345  0.345  0.000  1.0
  Ni  Ni3  1  0.255  0.500  0.755  1.0
  Ni  Ni4  1  0.745  0.500  0.245  1.0
  Ni  Ni5  1  0.227  0.727  0.500  1.0
  Ni  Ni6  1  0.773  0.273  0.500  1.0
  Ni  Ni7  1  0.000  0.000  0.500  1.0
  Ni  Ni8  1  0.000  0.500  0.000  1.0
  Ni  Ni9  1  0.500  0.500  0.500  1.0
  Ni  Ni10  1  0.500  0.000  0.000  1.0
  Ni  Ni11  1  0.652  0.000  0.652  1.0
  Ni  Ni12  1  0.348  0.000  0.348  1.0
[/CIF]
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The structure described by TbNi10Si2 crystallizes in the orthorhombic Immm space group. Tb(1) is bonded in a 20-coordinate geometry to two equivalent Ni(4), four equivalent Ni(1), four equivalent Ni(2), eight equivalent Ni(3), and two equivalent Si(1) atoms. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Tb(1), two equivalent Ni(2), two equivalent Ni(4), four equivalent Ni(3), and two equivalent Si(1) atoms to form a mixture of distorted corner, face, and edge-sharing NiTb2Si2Ni8 cuboctahedra. In the second Ni site, Ni(2) is bonded to two equivalent Tb(1), two equivalent Ni(1), two equivalent Ni(4), four equivalent Ni(3), and two equivalent Si(1) atoms to form a mixture of distorted corner, face, and edge-sharing NiTb2Si2Ni8 cuboctahedra. In the third Ni site, Ni(3) is bonded to two equivalent Tb(1), two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), and two equivalent Si(1) atoms to form a mixture of corner, face, and edge-sharing NiTb2Si2Ni8 cuboctahedra. In the fourth Ni site, Ni(4) is bonded in a 10-coordinate geometry to one Tb(1), one Ni(4), two equivalent Ni(1), two equivalent Ni(2), and four equivalent Ni(3) atoms. Si(1) is bonded in a 10-coordinate geometry to one Tb(1), two equivalent Ni(1), two equivalent Ni(2), four equivalent Ni(3), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Tb(SiNi5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.266
_cell_length_b   6.266
_cell_length_c   6.266
_cell_angle_alpha   135.542
_cell_angle_beta   100.123
_cell_angle_gamma   96.343
_symmetry_Int_Tables_number   1
_cell_volume   159.412
_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
  Tb  Tb0  1  0.000  0.000  0.000  1.0
  Si  Si1  1  0.655  0.655  0.000  1.0
  Si  Si2  1  0.345  0.345  0.000  1.0
  Ni  Ni3  1  0.255  0.500  0.755  1.0
  Ni  Ni4  1  0.745  0.500  0.245  1.0
  Ni  Ni5  1  0.227  0.727  0.500  1.0
  Ni  Ni6  1  0.773  0.273  0.500  1.0
  Ni  Ni7  1  0.000  0.000  0.500  1.0
  Ni  Ni8  1  0.000  0.500  0.000  1.0
  Ni  Ni9  1  0.500  0.500  0.500  1.0
  Ni  Ni10  1  0.500  0.000  0.000  1.0
  Ni  Ni11  1  0.652  0.000  0.652  1.0
  Ni  Ni12  1  0.348  0.000  0.348  1.0
[/CIF]
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