The material structure described by Tb3Co8Sn4 is Hexagonal Laves-derived structured and crystallizes in the hexagonal P6_3mc space group. Tb(1) is bonded in a 12-coordinate geometry to two equivalent Co(1), two equivalent Co(2), four equivalent Co(3), two equivalent Sn(1), and four equivalent Sn(2) atoms. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded in a 10-coordinate geometry to six equivalent Tb(1), one Sn(1), and three equivalent Sn(2) atoms. In the second Co site, Co(2) is bonded to two equivalent Tb(1), two equivalent Co(2), two equivalent Co(4), three equivalent Co(3), and three equivalent Sn(2) atoms to form distorted CoTb2Co7Sn3 cuboctahedra that share corners with four equivalent Co(2)Tb2Co7Sn3 cuboctahedra, corners with five equivalent Sn(2)Tb4Co8 cuboctahedra, faces with two equivalent Co(4)Co9Sn3 cuboctahedra, faces with six equivalent Co(2)Tb2Co7Sn3 cuboctahedra, and faces with six equivalent Sn(2)Tb4Co8 cuboctahedra. In the third Co site, Co(3) is bonded in a 12-coordinate geometry to four equivalent Tb(1), one Co(4), three equivalent Co(2), one Sn(1), and three equivalent Sn(2) atoms. In the fourth Co site, Co(4) is bonded to three equivalent Co(3), six equivalent Co(2), and three equivalent Sn(2) atoms to form CoCo9Sn3 cuboctahedra that share corners with three equivalent Sn(2)Tb4Co8 cuboctahedra, faces with two equivalent Co(4)Co9Sn3 cuboctahedra, faces with six equivalent Co(2)Tb2Co7Sn3 cuboctahedra, and faces with six equivalent Sn(2)Tb4Co8 cuboctahedra. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 10-coordinate geometry to six equivalent Tb(1), one Co(1), and three equivalent Co(3) atoms. In the second Sn site, Sn(2) is bonded to four equivalent Tb(1), one Co(1), one Co(4), three equivalent Co(2), and three equivalent Co(3) atoms to form distorted SnTb4Co8 cuboctahedra that share  a cornercorner with one Co(4)Co9Sn3 cuboctahedra, corners with four equivalent Sn(2)Tb4Co8 cuboctahedra, corners with five equivalent Co(2)Tb2Co7Sn3 cuboctahedra, faces with two equivalent Co(4)Co9Sn3 cuboctahedra, faces with six equivalent Co(2)Tb2Co7Sn3 cuboctahedra, and faces with eight equivalent Sn(2)Tb4Co8 cuboctahedra. is represented by the CIF file [CIF]
data_Tb3(Co2Sn)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.555
_cell_length_b   8.853
_cell_length_c   8.853
_cell_angle_alpha   120.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   512.807
_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  0.785  0.475  0.951  1.0
  Tb  Tb1  1  0.785  0.475  0.525  1.0
  Tb  Tb2  1  0.285  0.525  0.049  1.0
  Tb  Tb3  1  0.785  0.049  0.525  1.0
  Tb  Tb4  1  0.285  0.525  0.475  1.0
  Tb  Tb5  1  0.285  0.951  0.475  1.0
  Co  Co6  1  0.625  0.667  0.333  1.0
  Co  Co7  1  0.125  0.333  0.667  1.0
  Co  Co8  1  0.755  0.098  0.196  1.0
  Co  Co9  1  0.755  0.098  0.902  1.0
  Co  Co10  1  0.255  0.902  0.804  1.0
  Co  Co11  1  0.755  0.804  0.902  1.0
  Co  Co12  1  0.255  0.902  0.098  1.0
  Co  Co13  1  0.255  0.196  0.098  1.0
  Co  Co14  1  0.944  0.841  0.681  1.0
  Co  Co15  1  0.944  0.841  0.159  1.0
  Co  Co16  1  0.444  0.159  0.319  1.0
  Co  Co17  1  0.944  0.319  0.159  1.0
  Co  Co18  1  0.444  0.159  0.841  1.0
  Co  Co19  1  0.444  0.681  0.841  1.0
  Co  Co20  1  0.999  0.000  0.000  1.0
  Co  Co21  1  0.499  0.000  0.000  1.0
  Sn  Sn22  1  0.974  0.667  0.333  1.0
  Sn  Sn23  1  0.474  0.333  0.667  1.0
  Sn  Sn24  1  0.573  0.829  0.658  1.0
  Sn  Sn25  1  0.573  0.829  0.171  1.0
  Sn  Sn26  1  0.073  0.171  0.342  1.0
  Sn  Sn27  1  0.573  0.342  0.171  1.0
  Sn  Sn28  1  0.073  0.171  0.829  1.0
  Sn  Sn29  1  0.073  0.658  0.829  1.0
[/CIF]
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The material structure described by Tb3Co8Sn4 is Hexagonal Laves-derived structured and crystallizes in the hexagonal P6_3mc space group. Tb(1) is bonded in a 12-coordinate geometry to two equivalent Co(1), two equivalent Co(2), four equivalent Co(3), two equivalent Sn(1), and four equivalent Sn(2) atoms. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded in a 10-coordinate geometry to six equivalent Tb(1), one Sn(1), and three equivalent Sn(2) atoms. In the second Co site, Co(2) is bonded to two equivalent Tb(1), two equivalent Co(2), two equivalent Co(4), three equivalent Co(3), and three equivalent Sn(2) atoms to form distorted CoTb2Co7Sn3 cuboctahedra that share corners with four equivalent Co(2)Tb2Co7Sn3 cuboctahedra, corners with five equivalent Sn(2)Tb4Co8 cuboctahedra, faces with two equivalent Co(4)Co9Sn3 cuboctahedra, faces with six equivalent Co(2)Tb2Co7Sn3 cuboctahedra, and faces with six equivalent Sn(2)Tb4Co8 cuboctahedra. In the third Co site, Co(3) is bonded in a 12-coordinate geometry to four equivalent Tb(1), one Co(4), three equivalent Co(2), one Sn(1), and three equivalent Sn(2) atoms. In the fourth Co site, Co(4) is bonded to three equivalent Co(3), six equivalent Co(2), and three equivalent Sn(2) atoms to form CoCo9Sn3 cuboctahedra that share corners with three equivalent Sn(2)Tb4Co8 cuboctahedra, faces with two equivalent Co(4)Co9Sn3 cuboctahedra, faces with six equivalent Co(2)Tb2Co7Sn3 cuboctahedra, and faces with six equivalent Sn(2)Tb4Co8 cuboctahedra. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 10-coordinate geometry to six equivalent Tb(1), one Co(1), and three equivalent Co(3) atoms. In the second Sn site, Sn(2) is bonded to four equivalent Tb(1), one Co(1), one Co(4), three equivalent Co(2), and three equivalent Co(3) atoms to form distorted SnTb4Co8 cuboctahedra that share  a cornercorner with one Co(4)Co9Sn3 cuboctahedra, corners with four equivalent Sn(2)Tb4Co8 cuboctahedra, corners with five equivalent Co(2)Tb2Co7Sn3 cuboctahedra, faces with two equivalent Co(4)Co9Sn3 cuboctahedra, faces with six equivalent Co(2)Tb2Co7Sn3 cuboctahedra, and faces with eight equivalent Sn(2)Tb4Co8 cuboctahedra. is represented by the CIF file [CIF]
data_Tb3(Co2Sn)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.555
_cell_length_b   8.853
_cell_length_c   8.853
_cell_angle_alpha   120.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   512.807
_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  0.785  0.475  0.951  1.0
  Tb  Tb1  1  0.785  0.475  0.525  1.0
  Tb  Tb2  1  0.285  0.525  0.049  1.0
  Tb  Tb3  1  0.785  0.049  0.525  1.0
  Tb  Tb4  1  0.285  0.525  0.475  1.0
  Tb  Tb5  1  0.285  0.951  0.475  1.0
  Co  Co6  1  0.625  0.667  0.333  1.0
  Co  Co7  1  0.125  0.333  0.667  1.0
  Co  Co8  1  0.755  0.098  0.196  1.0
  Co  Co9  1  0.755  0.098  0.902  1.0
  Co  Co10  1  0.255  0.902  0.804  1.0
  Co  Co11  1  0.755  0.804  0.902  1.0
  Co  Co12  1  0.255  0.902  0.098  1.0
  Co  Co13  1  0.255  0.196  0.098  1.0
  Co  Co14  1  0.944  0.841  0.681  1.0
  Co  Co15  1  0.944  0.841  0.159  1.0
  Co  Co16  1  0.444  0.159  0.319  1.0
  Co  Co17  1  0.944  0.319  0.159  1.0
  Co  Co18  1  0.444  0.159  0.841  1.0
  Co  Co19  1  0.444  0.681  0.841  1.0
  Co  Co20  1  0.999  0.000  0.000  1.0
  Co  Co21  1  0.499  0.000  0.000  1.0
  Sn  Sn22  1  0.974  0.667  0.333  1.0
  Sn  Sn23  1  0.474  0.333  0.667  1.0
  Sn  Sn24  1  0.573  0.829  0.658  1.0
  Sn  Sn25  1  0.573  0.829  0.171  1.0
  Sn  Sn26  1  0.073  0.171  0.342  1.0
  Sn  Sn27  1  0.573  0.342  0.171  1.0
  Sn  Sn28  1  0.073  0.171  0.829  1.0
  Sn  Sn29  1  0.073  0.658  0.829  1.0
[/CIF]
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