The structure described by Sm11Sn10 crystallizes in the monoclinic C2/m space group. There are seven inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one Sn(1), one Sn(2), one Sn(5), two equivalent Sn(6), and two equivalent Sn(7) atoms to form a mixture of distorted edge, corner, and face-sharing SmSn7 pentagonal bipyramids. In the second Sm site, Sm(1) is bonded to one Sn(1), one Sn(2), one Sn(5), two equivalent Sn(6), and two equivalent Sn(7) atoms to form a mixture of distorted edge, corner, and face-sharing SmSn7 pentagonal bipyramids. In the third Sm site, Sm(2) is bonded in a 7-coordinate geometry to one Sn(3), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(6) atoms. In the fourth Sm site, Sm(3) is bonded in a 7-coordinate geometry to one Sn(4); two equivalent Sn(1); two equivalent Sn(2); and two Sn(7,7) atoms. In the fifth Sm site, Sm(4) is bonded in a 9-coordinate geometry to one Sn(2); two equivalent Sn(3); two equivalent Sn(4); two equivalent Sn(6); and two Sn(7,7) atoms. In the sixth Sm site, Sm(5) is bonded in a 7-coordinate geometry to one Sn(3), one Sn(4), one Sn(5), one Sn(6), one Sn(7), and two equivalent Sn(1) atoms. In the seventh Sm site, Sm(5) is bonded in a 7-coordinate geometry to one Sn(3), one Sn(4), one Sn(5), one Sn(6), one Sn(7), and two equivalent Sn(1) atoms. There are eight inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to one Sm(2); one Sm(3); two Sm(1,1); and four Sm(5,5) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Sm(4); two equivalent Sm(2); two equivalent Sm(3); and four Sm(1,1) atoms. In the third Sn site, Sn(3) is bonded in a 11-coordinate geometry to one Sm(2); two equivalent Sm(4); four Sm(5,5); two equivalent Sn(4); and two equivalent Sn(6) atoms. In the fourth Sn site, Sn(4) is bonded in a 11-coordinate geometry to one Sm(3); two equivalent Sm(4); four Sm(5,5); two equivalent Sn(3); and two Sn(7,7) atoms. In the fifth Sn site, Sn(5) is bonded in a 8-coordinate geometry to four Sm(1,1) and four Sm(5,5) atoms. In the sixth Sn site, Sn(6) is bonded in a 9-coordinate geometry to one Sm(2); one Sm(4); two Sm(5,5); four Sm(1,1); one Sn(3); and one Sn(6) atom. In the seventh Sn site, Sn(7) is bonded in a 9-coordinate geometry to one Sm(3), one Sm(4), two equivalent Sm(5), four equivalent Sm(1), one Sn(4), and one Sn(7) atom. In the eighth Sn site, Sn(7) is bonded in a 9-coordinate geometry to one Sm(3), one Sm(4), two equivalent Sm(5), four equivalent Sm(1), one Sn(4), and one Sn(7) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm11Sn10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.829
_cell_length_b   11.829
_cell_length_c   12.113
_cell_angle_alpha   119.233
_cell_angle_beta   119.233
_cell_angle_gamma   89.999
_symmetry_Int_Tables_number   1
_cell_volume   1225.860
_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
  Sm  Sm0  1  0.938  0.190  0.380  1.0
  Sm  Sm1  1  0.442  0.190  0.380  1.0
  Sm  Sm2  1  0.190  0.442  0.380  1.0
  Sm  Sm3  1  0.190  0.938  0.380  1.0
  Sm  Sm4  1  0.062  0.810  0.620  1.0
  Sm  Sm5  1  0.558  0.810  0.620  1.0
  Sm  Sm6  1  0.810  0.558  0.620  1.0
  Sm  Sm7  1  0.810  0.062  0.620  1.0
  Sm  Sm8  1  0.825  0.175  1.000  1.0
  Sm  Sm9  1  0.175  0.825  0.000  1.0
  Sm  Sm10  1  0.175  0.175  0.000  1.0
  Sm  Sm11  1  0.825  0.825  1.000  1.0
  Sm  Sm12  1  0.337  0.337  0.674  1.0
  Sm  Sm13  1  0.663  0.663  0.326  1.0
  Sm  Sm14  1  0.070  0.399  0.797  1.0
  Sm  Sm15  1  0.727  0.399  0.797  1.0
  Sm  Sm16  1  0.399  0.727  0.797  1.0
  Sm  Sm17  1  0.399  0.070  0.797  1.0
  Sm  Sm18  1  0.930  0.601  0.203  1.0
  Sm  Sm19  1  0.273  0.601  0.203  1.0
  Sm  Sm20  1  0.601  0.273  0.203  1.0
  Sm  Sm21  1  0.601  0.930  0.203  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  0.113  0.113  0.226  1.0
  Sn  Sn27  1  0.887  0.887  0.774  1.0
  Sn  Sn28  1  0.626  0.374  1.000  1.0
  Sn  Sn29  1  0.374  0.626  0.000  1.0
  Sn  Sn30  1  0.374  0.374  1.000  1.0
  Sn  Sn31  1  0.626  0.626  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  0.115  0.529  0.645  1.0
  Sn  Sn35  1  0.529  0.115  0.645  1.0
  Sn  Sn36  1  0.529  0.529  0.645  1.0
  Sn  Sn37  1  0.115  0.115  0.645  1.0
  Sn  Sn38  1  0.885  0.471  0.355  1.0
  Sn  Sn39  1  0.471  0.885  0.355  1.0
  Sn  Sn40  1  0.471  0.471  0.355  1.0
  Sn  Sn41  1  0.885  0.885  0.355  1.0
[/CIF]
.
The structure described by Sm11Sn10 crystallizes in the monoclinic C2/m space group. There are seven inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one Sn(1), one Sn(2), one Sn(5), two equivalent Sn(6), and two equivalent Sn(7) atoms to form a mixture of distorted edge, corner, and face-sharing SmSn7 pentagonal bipyramids. In the second Sm site, Sm(1) is bonded to one Sn(1), one Sn(2), one Sn(5), two equivalent Sn(6), and two equivalent Sn(7) atoms to form a mixture of distorted edge, corner, and face-sharing SmSn7 pentagonal bipyramids. In the third Sm site, Sm(2) is bonded in a 7-coordinate geometry to one Sn(3), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(6) atoms. In the fourth Sm site, Sm(3) is bonded in a 7-coordinate geometry to one Sn(4); two equivalent Sn(1); two equivalent Sn(2); and two Sn(7,7) atoms. In the fifth Sm site, Sm(4) is bonded in a 9-coordinate geometry to one Sn(2); two equivalent Sn(3); two equivalent Sn(4); two equivalent Sn(6); and two Sn(7,7) atoms. In the sixth Sm site, Sm(5) is bonded in a 7-coordinate geometry to one Sn(3), one Sn(4), one Sn(5), one Sn(6), one Sn(7), and two equivalent Sn(1) atoms. In the seventh Sm site, Sm(5) is bonded in a 7-coordinate geometry to one Sn(3), one Sn(4), one Sn(5), one Sn(6), one Sn(7), and two equivalent Sn(1) atoms. There are eight inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to one Sm(2); one Sm(3); two Sm(1,1); and four Sm(5,5) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Sm(4); two equivalent Sm(2); two equivalent Sm(3); and four Sm(1,1) atoms. In the third Sn site, Sn(3) is bonded in a 11-coordinate geometry to one Sm(2); two equivalent Sm(4); four Sm(5,5); two equivalent Sn(4); and two equivalent Sn(6) atoms. In the fourth Sn site, Sn(4) is bonded in a 11-coordinate geometry to one Sm(3); two equivalent Sm(4); four Sm(5,5); two equivalent Sn(3); and two Sn(7,7) atoms. In the fifth Sn site, Sn(5) is bonded in a 8-coordinate geometry to four Sm(1,1) and four Sm(5,5) atoms. In the sixth Sn site, Sn(6) is bonded in a 9-coordinate geometry to one Sm(2); one Sm(4); two Sm(5,5); four Sm(1,1); one Sn(3); and one Sn(6) atom. In the seventh Sn site, Sn(7) is bonded in a 9-coordinate geometry to one Sm(3), one Sm(4), two equivalent Sm(5), four equivalent Sm(1), one Sn(4), and one Sn(7) atom. In the eighth Sn site, Sn(7) is bonded in a 9-coordinate geometry to one Sm(3), one Sm(4), two equivalent Sm(5), four equivalent Sm(1), one Sn(4), and one Sn(7) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm11Sn10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.829
_cell_length_b   11.829
_cell_length_c   12.113
_cell_angle_alpha   119.233
_cell_angle_beta   119.233
_cell_angle_gamma   89.999
_symmetry_Int_Tables_number   1
_cell_volume   1225.860
_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
  Sm  Sm0  1  0.938  0.190  0.380  1.0
  Sm  Sm1  1  0.442  0.190  0.380  1.0
  Sm  Sm2  1  0.190  0.442  0.380  1.0
  Sm  Sm3  1  0.190  0.938  0.380  1.0
  Sm  Sm4  1  0.062  0.810  0.620  1.0
  Sm  Sm5  1  0.558  0.810  0.620  1.0
  Sm  Sm6  1  0.810  0.558  0.620  1.0
  Sm  Sm7  1  0.810  0.062  0.620  1.0
  Sm  Sm8  1  0.825  0.175  1.000  1.0
  Sm  Sm9  1  0.175  0.825  0.000  1.0
  Sm  Sm10  1  0.175  0.175  0.000  1.0
  Sm  Sm11  1  0.825  0.825  1.000  1.0
  Sm  Sm12  1  0.337  0.337  0.674  1.0
  Sm  Sm13  1  0.663  0.663  0.326  1.0
  Sm  Sm14  1  0.070  0.399  0.797  1.0
  Sm  Sm15  1  0.727  0.399  0.797  1.0
  Sm  Sm16  1  0.399  0.727  0.797  1.0
  Sm  Sm17  1  0.399  0.070  0.797  1.0
  Sm  Sm18  1  0.930  0.601  0.203  1.0
  Sm  Sm19  1  0.273  0.601  0.203  1.0
  Sm  Sm20  1  0.601  0.273  0.203  1.0
  Sm  Sm21  1  0.601  0.930  0.203  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  0.113  0.113  0.226  1.0
  Sn  Sn27  1  0.887  0.887  0.774  1.0
  Sn  Sn28  1  0.626  0.374  1.000  1.0
  Sn  Sn29  1  0.374  0.626  0.000  1.0
  Sn  Sn30  1  0.374  0.374  1.000  1.0
  Sn  Sn31  1  0.626  0.626  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  0.115  0.529  0.645  1.0
  Sn  Sn35  1  0.529  0.115  0.645  1.0
  Sn  Sn36  1  0.529  0.529  0.645  1.0
  Sn  Sn37  1  0.115  0.115  0.645  1.0
  Sn  Sn38  1  0.885  0.471  0.355  1.0
  Sn  Sn39  1  0.471  0.885  0.355  1.0
  Sn  Sn40  1  0.471  0.471  0.355  1.0
  Sn  Sn41  1  0.885  0.885  0.355  1.0
[/CIF]
.