The material structure described by Sr11Cd6Sb12 crystallizes in the monoclinic C2/m space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to two equivalent Cd(1), two equivalent Cd(2), two equivalent Sb(1), and four equivalent Sb(2) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one Cd(3), one Sb(5), one Sb(6), two equivalent Sb(2), and two equivalent Sb(4) atoms. In the third Sr site, Sr(3) is bonded to one Sb(5), one Sb(6), two equivalent Sb(1), and two equivalent Sb(3) atoms to form SrSb6 octahedra that share corners with two equivalent Sr(6)Cd4Sb6 octahedra, edges with two equivalent Sr(3)Sb6 octahedra, and  a faceface with one Sr(6)Cd4Sb6 octahedra. The corner-sharing octahedral tilt angles are 50°. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to three equivalent Cd(3), one Sb(6), two equivalent Sb(3), and three equivalent Sb(4) atoms. In the fifth Sr site, Sr(5) is bonded in a 7-coordinate geometry to two equivalent Cd(3), two equivalent Sb(5), and three equivalent Sb(3) atoms. In the sixth Sr site, Sr(6) is bonded to four equivalent Cd(1), two equivalent Sb(6), and four equivalent Sb(1) atoms to form distorted SrCd4Sb6 octahedra that share corners with four equivalent Sr(3)Sb6 octahedra, faces with two equivalent Sr(6)Cd4Sb6 octahedra, and faces with two equivalent Sr(3)Sb6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are three inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Sr(6), one Sb(1), one Sb(2), and two equivalent Sb(6) atoms. In the second Cd site, Cd(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), one Sb(1), one Sb(2), and two equivalent Sb(5) atoms. In the third Cd site, Cd(3) is bonded in a 10-coordinate geometry to one Sr(2), two equivalent Sr(5), three equivalent Sr(4), one Sb(3), one Sb(5), and two equivalent Sb(4) atoms. There are six inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), two equivalent Sr(6), one Cd(1), and one Cd(2) atom. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to two equivalent Sr(2), four equivalent Sr(1), one Cd(1), one Cd(2), and one Sb(2) atom. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to two equivalent Sr(3), two equivalent Sr(4), three equivalent Sr(5), and one Cd(3) atom. In the fourth Sb site, Sb(4) is bonded in a 7-coordinate geometry to two equivalent Sr(2), three equivalent Sr(4), and two equivalent Cd(3) atoms. In the fifth Sb site, Sb(5) is bonded in a 7-coordinate geometry to one Sr(2), one Sr(3), two equivalent Sr(5), one Cd(3), and two equivalent Cd(2) atoms. In the sixth Sb site, Sb(6) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Sr(6), and two equivalent Cd(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr11(CdSb2)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   16.855
_cell_length_b   16.855
_cell_length_c   12.762
_cell_angle_alpha   70.291
_cell_angle_beta   70.291
_cell_angle_gamma   16.477
_symmetry_Int_Tables_number   1
_cell_volume   966.824
_cell_formula_units_Z   1
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
  Sr  Sr0  1  0.981  0.981  0.681  1.0
  Sr  Sr1  1  0.019  0.019  0.319  1.0
  Sr  Sr2  1  0.886  0.886  0.506  1.0
  Sr  Sr3  1  0.114  0.114  0.494  1.0
  Sr  Sr4  1  0.874  0.874  0.016  1.0
  Sr  Sr5  1  0.126  0.126  0.984  1.0
  Sr  Sr6  1  0.799  0.799  0.343  1.0
  Sr  Sr7  1  0.201  0.201  0.657  1.0
  Sr  Sr8  1  0.722  0.722  0.133  1.0
  Sr  Sr9  1  0.278  0.278  0.867  1.0
  Sr  Sr10  1  0.000  0.000  0.000  1.0
  Cd  Cd11  1  0.452  0.452  0.245  1.0
  Cd  Cd12  1  0.400  0.400  0.745  1.0
  Cd  Cd13  1  0.600  0.600  0.255  1.0
  Cd  Cd14  1  0.548  0.548  0.755  1.0
  Cd  Cd15  1  0.219  0.219  0.333  1.0
  Cd  Cd16  1  0.781  0.781  0.667  1.0
  Sb  Sb17  1  0.547  0.547  0.116  1.0
  Sb  Sb18  1  0.453  0.453  0.884  1.0
  Sb  Sb19  1  0.543  0.543  0.500  1.0
  Sb  Sb20  1  0.457  0.457  0.500  1.0
  Sb  Sb21  1  0.295  0.295  0.135  1.0
  Sb  Sb22  1  0.705  0.705  0.865  1.0
  Sb  Sb23  1  0.309  0.309  0.530  1.0
  Sb  Sb24  1  0.691  0.691  0.470  1.0
  Sb  Sb25  1  0.850  0.850  0.784  1.0
  Sb  Sb26  1  0.090  0.090  0.767  1.0
  Sb  Sb27  1  0.910  0.910  0.233  1.0
  Sb  Sb28  1  0.150  0.150  0.216  1.0
[/CIF]
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The material structure described by Sr11Cd6Sb12 crystallizes in the monoclinic C2/m space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to two equivalent Cd(1), two equivalent Cd(2), two equivalent Sb(1), and four equivalent Sb(2) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one Cd(3), one Sb(5), one Sb(6), two equivalent Sb(2), and two equivalent Sb(4) atoms. In the third Sr site, Sr(3) is bonded to one Sb(5), one Sb(6), two equivalent Sb(1), and two equivalent Sb(3) atoms to form SrSb6 octahedra that share corners with two equivalent Sr(6)Cd4Sb6 octahedra, edges with two equivalent Sr(3)Sb6 octahedra, and  a faceface with one Sr(6)Cd4Sb6 octahedra. The corner-sharing octahedral tilt angles are 50°. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to three equivalent Cd(3), one Sb(6), two equivalent Sb(3), and three equivalent Sb(4) atoms. In the fifth Sr site, Sr(5) is bonded in a 7-coordinate geometry to two equivalent Cd(3), two equivalent Sb(5), and three equivalent Sb(3) atoms. In the sixth Sr site, Sr(6) is bonded to four equivalent Cd(1), two equivalent Sb(6), and four equivalent Sb(1) atoms to form distorted SrCd4Sb6 octahedra that share corners with four equivalent Sr(3)Sb6 octahedra, faces with two equivalent Sr(6)Cd4Sb6 octahedra, and faces with two equivalent Sr(3)Sb6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are three inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Sr(6), one Sb(1), one Sb(2), and two equivalent Sb(6) atoms. In the second Cd site, Cd(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), one Sb(1), one Sb(2), and two equivalent Sb(5) atoms. In the third Cd site, Cd(3) is bonded in a 10-coordinate geometry to one Sr(2), two equivalent Sr(5), three equivalent Sr(4), one Sb(3), one Sb(5), and two equivalent Sb(4) atoms. There are six inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), two equivalent Sr(6), one Cd(1), and one Cd(2) atom. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to two equivalent Sr(2), four equivalent Sr(1), one Cd(1), one Cd(2), and one Sb(2) atom. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to two equivalent Sr(3), two equivalent Sr(4), three equivalent Sr(5), and one Cd(3) atom. In the fourth Sb site, Sb(4) is bonded in a 7-coordinate geometry to two equivalent Sr(2), three equivalent Sr(4), and two equivalent Cd(3) atoms. In the fifth Sb site, Sb(5) is bonded in a 7-coordinate geometry to one Sr(2), one Sr(3), two equivalent Sr(5), one Cd(3), and two equivalent Cd(2) atoms. In the sixth Sb site, Sb(6) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Sr(6), and two equivalent Cd(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr11(CdSb2)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   16.855
_cell_length_b   16.855
_cell_length_c   12.762
_cell_angle_alpha   70.291
_cell_angle_beta   70.291
_cell_angle_gamma   16.477
_symmetry_Int_Tables_number   1
_cell_volume   966.824
_cell_formula_units_Z   1
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
  Sr  Sr0  1  0.981  0.981  0.681  1.0
  Sr  Sr1  1  0.019  0.019  0.319  1.0
  Sr  Sr2  1  0.886  0.886  0.506  1.0
  Sr  Sr3  1  0.114  0.114  0.494  1.0
  Sr  Sr4  1  0.874  0.874  0.016  1.0
  Sr  Sr5  1  0.126  0.126  0.984  1.0
  Sr  Sr6  1  0.799  0.799  0.343  1.0
  Sr  Sr7  1  0.201  0.201  0.657  1.0
  Sr  Sr8  1  0.722  0.722  0.133  1.0
  Sr  Sr9  1  0.278  0.278  0.867  1.0
  Sr  Sr10  1  0.000  0.000  0.000  1.0
  Cd  Cd11  1  0.452  0.452  0.245  1.0
  Cd  Cd12  1  0.400  0.400  0.745  1.0
  Cd  Cd13  1  0.600  0.600  0.255  1.0
  Cd  Cd14  1  0.548  0.548  0.755  1.0
  Cd  Cd15  1  0.219  0.219  0.333  1.0
  Cd  Cd16  1  0.781  0.781  0.667  1.0
  Sb  Sb17  1  0.547  0.547  0.116  1.0
  Sb  Sb18  1  0.453  0.453  0.884  1.0
  Sb  Sb19  1  0.543  0.543  0.500  1.0
  Sb  Sb20  1  0.457  0.457  0.500  1.0
  Sb  Sb21  1  0.295  0.295  0.135  1.0
  Sb  Sb22  1  0.705  0.705  0.865  1.0
  Sb  Sb23  1  0.309  0.309  0.530  1.0
  Sb  Sb24  1  0.691  0.691  0.470  1.0
  Sb  Sb25  1  0.850  0.850  0.784  1.0
  Sb  Sb26  1  0.090  0.090  0.767  1.0
  Sb  Sb27  1  0.910  0.910  0.233  1.0
  Sb  Sb28  1  0.150  0.150  0.216  1.0
[/CIF]
.