The material structure described by Tb3NiSi2 crystallizes in the orthorhombic Pnma space group. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 8-coordinate geometry to three equivalent Ni(1), two equivalent Si(2), and three equivalent Si(1) atoms. In the second Tb site, Tb(2) is bonded in a 6-coordinate geometry to one Ni(1), two equivalent Si(1), and three equivalent Si(2) atoms. In the third Tb site, Tb(3) is bonded in a 6-coordinate geometry to two equivalent Ni(1), two equivalent Si(1), and three equivalent Si(2) atoms. Ni(1) is bonded in a 9-coordinate geometry to one Tb(2), two equivalent Tb(3), three equivalent Tb(1), one Si(2), and two equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Tb(2), two equivalent Tb(3), three equivalent Tb(1), and two equivalent Ni(1) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Tb(1), three equivalent Tb(2), three equivalent Tb(3), and one Ni(1) atom. is represented by the CIF card [CIF]
data_Tb3Si2Ni
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.141
_cell_length_b   11.248
_cell_length_c   11.333
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   527.827
_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
  Tb  Tb0  1  0.250  0.060  0.881  1.0
  Tb  Tb1  1  0.250  0.440  0.381  1.0
  Tb  Tb2  1  0.750  0.940  0.119  1.0
  Tb  Tb3  1  0.750  0.560  0.619  1.0
  Tb  Tb4  1  0.250  0.125  0.558  1.0
  Tb  Tb5  1  0.250  0.375  0.058  1.0
  Tb  Tb6  1  0.750  0.875  0.442  1.0
  Tb  Tb7  1  0.750  0.625  0.942  1.0
  Tb  Tb8  1  0.250  0.803  0.714  1.0
  Tb  Tb9  1  0.250  0.697  0.214  1.0
  Tb  Tb10  1  0.750  0.197  0.286  1.0
  Tb  Tb11  1  0.750  0.303  0.786  1.0
  Si  Si12  1  0.250  0.814  0.974  1.0
  Si  Si13  1  0.250  0.686  0.474  1.0
  Si  Si14  1  0.750  0.186  0.026  1.0
  Si  Si15  1  0.750  0.314  0.526  1.0
  Si  Si16  1  0.250  0.495  0.803  1.0
  Si  Si17  1  0.250  0.005  0.303  1.0
  Si  Si18  1  0.750  0.505  0.197  1.0
  Si  Si19  1  0.750  0.995  0.697  1.0
  Ni  Ni20  1  0.250  0.367  0.629  1.0
  Ni  Ni21  1  0.250  0.133  0.129  1.0
  Ni  Ni22  1  0.750  0.633  0.371  1.0
  Ni  Ni23  1  0.750  0.867  0.871  1.0
[/CIF]
.
The material structure described by Tb3NiSi2 crystallizes in the orthorhombic Pnma space group. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 8-coordinate geometry to three equivalent Ni(1), two equivalent Si(2), and three equivalent Si(1) atoms. In the second Tb site, Tb(2) is bonded in a 6-coordinate geometry to one Ni(1), two equivalent Si(1), and three equivalent Si(2) atoms. In the third Tb site, Tb(3) is bonded in a 6-coordinate geometry to two equivalent Ni(1), two equivalent Si(1), and three equivalent Si(2) atoms. Ni(1) is bonded in a 9-coordinate geometry to one Tb(2), two equivalent Tb(3), three equivalent Tb(1), one Si(2), and two equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Tb(2), two equivalent Tb(3), three equivalent Tb(1), and two equivalent Ni(1) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Tb(1), three equivalent Tb(2), three equivalent Tb(3), and one Ni(1) atom. is represented by the CIF card [CIF]
data_Tb3Si2Ni
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.141
_cell_length_b   11.248
_cell_length_c   11.333
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   527.827
_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
  Tb  Tb0  1  0.250  0.060  0.881  1.0
  Tb  Tb1  1  0.250  0.440  0.381  1.0
  Tb  Tb2  1  0.750  0.940  0.119  1.0
  Tb  Tb3  1  0.750  0.560  0.619  1.0
  Tb  Tb4  1  0.250  0.125  0.558  1.0
  Tb  Tb5  1  0.250  0.375  0.058  1.0
  Tb  Tb6  1  0.750  0.875  0.442  1.0
  Tb  Tb7  1  0.750  0.625  0.942  1.0
  Tb  Tb8  1  0.250  0.803  0.714  1.0
  Tb  Tb9  1  0.250  0.697  0.214  1.0
  Tb  Tb10  1  0.750  0.197  0.286  1.0
  Tb  Tb11  1  0.750  0.303  0.786  1.0
  Si  Si12  1  0.250  0.814  0.974  1.0
  Si  Si13  1  0.250  0.686  0.474  1.0
  Si  Si14  1  0.750  0.186  0.026  1.0
  Si  Si15  1  0.750  0.314  0.526  1.0
  Si  Si16  1  0.250  0.495  0.803  1.0
  Si  Si17  1  0.250  0.005  0.303  1.0
  Si  Si18  1  0.750  0.505  0.197  1.0
  Si  Si19  1  0.750  0.995  0.697  1.0
  Ni  Ni20  1  0.250  0.367  0.629  1.0
  Ni  Ni21  1  0.250  0.133  0.129  1.0
  Ni  Ni22  1  0.750  0.633  0.371  1.0
  Ni  Ni23  1  0.750  0.867  0.871  1.0
[/CIF]
.