The structure described by TbCo9Si2 crystallizes in the tetragonal I4_1/amd space group. Tb(1) is bonded in a 18-coordinate geometry to two equivalent Co(1) and sixteen equivalent Co(2) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to two equivalent Tb(1), eight equivalent Co(2), and four equivalent Si(1) atoms. In the second Co site, Co(2) is bonded to two equivalent Tb(1), one Co(1), seven equivalent Co(2), and two equivalent Si(1) atoms to form a mixture of distorted edge, face, and corner-sharing CoTb2Co8Si2 cuboctahedra. Si(1) is bonded in a 10-coordinate geometry to two equivalent Co(1) and eight equivalent Co(2) atoms. is represented by the CIF file [CIF]
data_TbCo9Si2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.261
_cell_length_b   7.518
_cell_length_c   7.518
_cell_angle_alpha   80.015
_cell_angle_beta   65.393
_cell_angle_gamma   65.393
_symmetry_Int_Tables_number   1
_cell_volume   292.531
_cell_formula_units_Z   2
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  0.375  0.250  0.750  1.0
  Tb  Tb1  1  0.625  0.750  0.250  1.0
  Co  Co2  1  0.125  0.750  0.250  1.0
  Co  Co3  1  0.875  0.250  0.750  1.0
  Co  Co4  1  0.560  0.579  0.667  1.0
  Co  Co5  1  0.560  0.167  0.079  1.0
  Co  Co6  1  0.139  0.421  0.167  1.0
  Co  Co7  1  0.139  0.667  0.921  1.0
  Co  Co8  1  0.806  0.333  0.421  1.0
  Co  Co9  1  0.806  0.921  0.833  1.0
  Co  Co10  1  0.727  0.833  0.579  1.0
  Co  Co11  1  0.727  0.079  0.333  1.0
  Co  Co12  1  0.440  0.421  0.333  1.0
  Co  Co13  1  0.440  0.833  0.921  1.0
  Co  Co14  1  0.861  0.579  0.833  1.0
  Co  Co15  1  0.861  0.333  0.079  1.0
  Co  Co16  1  0.194  0.667  0.579  1.0
  Co  Co17  1  0.194  0.079  0.167  1.0
  Co  Co18  1  0.273  0.167  0.421  1.0
  Co  Co19  1  0.273  0.921  0.667  1.0
  Si  Si20  1  0.500  0.500  0.000  1.0
  Si  Si21  1  0.000  0.500  0.500  1.0
  Si  Si22  1  0.000  0.000  0.000  1.0
  Si  Si23  1  0.000  0.000  0.500  1.0
[/CIF]
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The structure described by TbCo9Si2 crystallizes in the tetragonal I4_1/amd space group. Tb(1) is bonded in a 18-coordinate geometry to two equivalent Co(1) and sixteen equivalent Co(2) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 14-coordinate geometry to two equivalent Tb(1), eight equivalent Co(2), and four equivalent Si(1) atoms. In the second Co site, Co(2) is bonded to two equivalent Tb(1), one Co(1), seven equivalent Co(2), and two equivalent Si(1) atoms to form a mixture of distorted edge, face, and corner-sharing CoTb2Co8Si2 cuboctahedra. Si(1) is bonded in a 10-coordinate geometry to two equivalent Co(1) and eight equivalent Co(2) atoms. is represented by the CIF file [CIF]
data_TbCo9Si2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.261
_cell_length_b   7.518
_cell_length_c   7.518
_cell_angle_alpha   80.015
_cell_angle_beta   65.393
_cell_angle_gamma   65.393
_symmetry_Int_Tables_number   1
_cell_volume   292.531
_cell_formula_units_Z   2
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  0.375  0.250  0.750  1.0
  Tb  Tb1  1  0.625  0.750  0.250  1.0
  Co  Co2  1  0.125  0.750  0.250  1.0
  Co  Co3  1  0.875  0.250  0.750  1.0
  Co  Co4  1  0.560  0.579  0.667  1.0
  Co  Co5  1  0.560  0.167  0.079  1.0
  Co  Co6  1  0.139  0.421  0.167  1.0
  Co  Co7  1  0.139  0.667  0.921  1.0
  Co  Co8  1  0.806  0.333  0.421  1.0
  Co  Co9  1  0.806  0.921  0.833  1.0
  Co  Co10  1  0.727  0.833  0.579  1.0
  Co  Co11  1  0.727  0.079  0.333  1.0
  Co  Co12  1  0.440  0.421  0.333  1.0
  Co  Co13  1  0.440  0.833  0.921  1.0
  Co  Co14  1  0.861  0.579  0.833  1.0
  Co  Co15  1  0.861  0.333  0.079  1.0
  Co  Co16  1  0.194  0.667  0.579  1.0
  Co  Co17  1  0.194  0.079  0.167  1.0
  Co  Co18  1  0.273  0.167  0.421  1.0
  Co  Co19  1  0.273  0.921  0.667  1.0
  Si  Si20  1  0.500  0.500  0.000  1.0
  Si  Si21  1  0.000  0.500  0.500  1.0
  Si  Si22  1  0.000  0.000  0.000  1.0
  Si  Si23  1  0.000  0.000  0.500  1.0
[/CIF]
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