The material described by Sn10Tb11 crystallizes in the tetragonal I4/mmm space group. There are four inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to one Sn(1), one Sn(2), one Sn(4), and four equivalent Sn(5) atoms to form a mixture of distorted corner, edge, and face-sharing TbSn7 pentagonal bipyramids. In the second Tb site, Tb(2) is bonded in a 7-coordinate geometry to one Sn(3), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(5) atoms. In the third Tb site, Tb(3) is bonded in a 9-coordinate geometry to one Sn(2), four equivalent Sn(3), and four equivalent Sn(5) atoms. In the fourth Tb site, Tb(4) is bonded in a 7-coordinate geometry to one Sn(4), two equivalent Sn(1), two equivalent Sn(3), and two equivalent Sn(5) atoms. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to two equivalent Tb(1), two equivalent Tb(2), and four equivalent Tb(4) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Tb(3), four equivalent Tb(1), and four equivalent Tb(2) atoms. In the third Sn site, Sn(3) is bonded in a 11-coordinate geometry to one Tb(2), two equivalent Tb(3), four equivalent Tb(4), two equivalent Sn(3), and two equivalent Sn(5) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to four equivalent Tb(1) and four equivalent Tb(4) atoms. In the fifth Sn site, Sn(5) is bonded in a 10-coordinate geometry to one Tb(2), one Tb(3), two equivalent Tb(4), four equivalent Tb(1), one Sn(3), and one Sn(5) atom. is represented by the CIF file [CIF]
data_Tb11Sn10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.544
_cell_length_b   11.544
_cell_length_c   11.784
_cell_angle_alpha   119.328
_cell_angle_beta   119.328
_cell_angle_gamma   90.004
_symmetry_Int_Tables_number   1
_cell_volume   1132.578
_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  0.938  0.189  0.378  1.0
  Tb  Tb1  1  0.441  0.189  0.378  1.0
  Tb  Tb2  1  0.189  0.441  0.378  1.0
  Tb  Tb3  1  0.189  0.938  0.378  1.0
  Tb  Tb4  1  0.062  0.811  0.622  1.0
  Tb  Tb5  1  0.559  0.811  0.622  1.0
  Tb  Tb6  1  0.811  0.559  0.622  1.0
  Tb  Tb7  1  0.811  0.062  0.622  1.0
  Tb  Tb8  1  0.826  0.174  1.000  1.0
  Tb  Tb9  1  0.174  0.826  0.000  1.0
  Tb  Tb10  1  0.174  0.174  0.000  1.0
  Tb  Tb11  1  0.826  0.826  1.000  1.0
  Tb  Tb12  1  0.335  0.335  0.670  1.0
  Tb  Tb13  1  0.665  0.665  0.330  1.0
  Tb  Tb14  1  0.067  0.398  0.796  1.0
  Tb  Tb15  1  0.729  0.398  0.796  1.0
  Tb  Tb16  1  0.398  0.729  0.796  1.0
  Tb  Tb17  1  0.398  0.067  0.796  1.0
  Tb  Tb18  1  0.933  0.602  0.204  1.0
  Tb  Tb19  1  0.271  0.602  0.204  1.0
  Tb  Tb20  1  0.602  0.271  0.204  1.0
  Tb  Tb21  1  0.602  0.933  0.204  1.0
  Sn  Sn22  1  1.000  0.356  1.000  1.0
  Sn  Sn23  1  0.000  0.644  0.000  1.0
  Sn  Sn24  1  0.356  1.000  1.000  1.0
  Sn  Sn25  1  0.644  0.000  0.000  1.0
  Sn  Sn26  1  0.112  0.112  0.224  1.0
  Sn  Sn27  1  0.888  0.888  0.776  1.0
  Sn  Sn28  1  0.629  0.371  0.000  1.0
  Sn  Sn29  1  0.371  0.629  1.000  1.0
  Sn  Sn30  1  0.371  0.371  1.000  1.0
  Sn  Sn31  1  0.629  0.629  0.000  1.0
  Sn  Sn32  1  0.750  0.250  0.500  1.0
  Sn  Sn33  1  0.250  0.750  0.500  1.0
  Sn  Sn34  1  0.117  0.530  0.648  1.0
  Sn  Sn35  1  0.530  0.117  0.648  1.0
  Sn  Sn36  1  0.530  0.530  0.648  1.0
  Sn  Sn37  1  0.118  0.118  0.648  1.0
  Sn  Sn38  1  0.883  0.470  0.352  1.0
  Sn  Sn39  1  0.470  0.883  0.352  1.0
  Sn  Sn40  1  0.470  0.470  0.352  1.0
  Sn  Sn41  1  0.882  0.882  0.352  1.0
[/CIF]
.
The material described by Sn10Tb11 crystallizes in the tetragonal I4/mmm space group. There are four inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to one Sn(1), one Sn(2), one Sn(4), and four equivalent Sn(5) atoms to form a mixture of distorted corner, edge, and face-sharing TbSn7 pentagonal bipyramids. In the second Tb site, Tb(2) is bonded in a 7-coordinate geometry to one Sn(3), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(5) atoms. In the third Tb site, Tb(3) is bonded in a 9-coordinate geometry to one Sn(2), four equivalent Sn(3), and four equivalent Sn(5) atoms. In the fourth Tb site, Tb(4) is bonded in a 7-coordinate geometry to one Sn(4), two equivalent Sn(1), two equivalent Sn(3), and two equivalent Sn(5) atoms. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to two equivalent Tb(1), two equivalent Tb(2), and four equivalent Tb(4) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Tb(3), four equivalent Tb(1), and four equivalent Tb(2) atoms. In the third Sn site, Sn(3) is bonded in a 11-coordinate geometry to one Tb(2), two equivalent Tb(3), four equivalent Tb(4), two equivalent Sn(3), and two equivalent Sn(5) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to four equivalent Tb(1) and four equivalent Tb(4) atoms. In the fifth Sn site, Sn(5) is bonded in a 10-coordinate geometry to one Tb(2), one Tb(3), two equivalent Tb(4), four equivalent Tb(1), one Sn(3), and one Sn(5) atom. is represented by the CIF file [CIF]
data_Tb11Sn10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.544
_cell_length_b   11.544
_cell_length_c   11.784
_cell_angle_alpha   119.328
_cell_angle_beta   119.328
_cell_angle_gamma   90.004
_symmetry_Int_Tables_number   1
_cell_volume   1132.578
_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  0.938  0.189  0.378  1.0
  Tb  Tb1  1  0.441  0.189  0.378  1.0
  Tb  Tb2  1  0.189  0.441  0.378  1.0
  Tb  Tb3  1  0.189  0.938  0.378  1.0
  Tb  Tb4  1  0.062  0.811  0.622  1.0
  Tb  Tb5  1  0.559  0.811  0.622  1.0
  Tb  Tb6  1  0.811  0.559  0.622  1.0
  Tb  Tb7  1  0.811  0.062  0.622  1.0
  Tb  Tb8  1  0.826  0.174  1.000  1.0
  Tb  Tb9  1  0.174  0.826  0.000  1.0
  Tb  Tb10  1  0.174  0.174  0.000  1.0
  Tb  Tb11  1  0.826  0.826  1.000  1.0
  Tb  Tb12  1  0.335  0.335  0.670  1.0
  Tb  Tb13  1  0.665  0.665  0.330  1.0
  Tb  Tb14  1  0.067  0.398  0.796  1.0
  Tb  Tb15  1  0.729  0.398  0.796  1.0
  Tb  Tb16  1  0.398  0.729  0.796  1.0
  Tb  Tb17  1  0.398  0.067  0.796  1.0
  Tb  Tb18  1  0.933  0.602  0.204  1.0
  Tb  Tb19  1  0.271  0.602  0.204  1.0
  Tb  Tb20  1  0.602  0.271  0.204  1.0
  Tb  Tb21  1  0.602  0.933  0.204  1.0
  Sn  Sn22  1  1.000  0.356  1.000  1.0
  Sn  Sn23  1  0.000  0.644  0.000  1.0
  Sn  Sn24  1  0.356  1.000  1.000  1.0
  Sn  Sn25  1  0.644  0.000  0.000  1.0
  Sn  Sn26  1  0.112  0.112  0.224  1.0
  Sn  Sn27  1  0.888  0.888  0.776  1.0
  Sn  Sn28  1  0.629  0.371  0.000  1.0
  Sn  Sn29  1  0.371  0.629  1.000  1.0
  Sn  Sn30  1  0.371  0.371  1.000  1.0
  Sn  Sn31  1  0.629  0.629  0.000  1.0
  Sn  Sn32  1  0.750  0.250  0.500  1.0
  Sn  Sn33  1  0.250  0.750  0.500  1.0
  Sn  Sn34  1  0.117  0.530  0.648  1.0
  Sn  Sn35  1  0.530  0.117  0.648  1.0
  Sn  Sn36  1  0.530  0.530  0.648  1.0
  Sn  Sn37  1  0.118  0.118  0.648  1.0
  Sn  Sn38  1  0.883  0.470  0.352  1.0
  Sn  Sn39  1  0.470  0.883  0.352  1.0
  Sn  Sn40  1  0.470  0.470  0.352  1.0
  Sn  Sn41  1  0.882  0.882  0.352  1.0
[/CIF]
.