The material structure described by Eu16Sb11 crystallizes in the orthorhombic P2_12_12 space group. There are nine inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 6-coordinate geometry to one Sb(1), one Sb(3), one Sb(5), one Sb(6), and two equivalent Sb(2) atoms. In the second Eu site, Eu(2) is bonded in a 6-coordinate geometry to one Sb(1), one Sb(3), one Sb(5), one Sb(6), and two equivalent Sb(2) atoms. In the third Eu site, Eu(3) is bonded to one Sb(1), one Sb(3), and two equivalent Sb(4) atoms to form distorted EuSb4 trigonal pyramids that share  a cornercorner with one Eu(4)Sb4 tetrahedra, corners with two equivalent Eu(8)Sb5 trigonal bipyramids, corners with two equivalent Eu(9)Sb5 trigonal bipyramids,  an edgeedge with one Eu(8)Sb5 trigonal bipyramid,  an edgeedge with one Eu(9)Sb5 trigonal bipyramid, and  an edgeedge with one Eu(3)Sb4 trigonal pyramid. In the fourth Eu site, Eu(4) is bonded to two equivalent Sb(1) and two equivalent Sb(2) atoms to form distorted EuSb4 tetrahedra that share corners with two equivalent Eu(8)Sb5 trigonal bipyramids, corners with two equivalent Eu(9)Sb5 trigonal bipyramids, and corners with two equivalent Eu(3)Sb4 trigonal pyramids. In the fifth Eu site, Eu(5) is bonded in a 6-coordinate geometry to one Sb(1), one Sb(2), one Sb(3), one Sb(4), one Sb(6), and one Sb(7) atom. In the sixth Eu site, Eu(6) is bonded in a 6-coordinate geometry to one Sb(1), one Sb(2), one Sb(3), one Sb(4), one Sb(5), and one Sb(7) atom. In the seventh Eu site, Eu(7) is bonded in a distorted see-saw-like geometry to two equivalent Sb(2) and two equivalent Sb(3) atoms. In the eighth Eu site, Eu(8) is bonded to one Sb(1), one Sb(3), one Sb(4), one Sb(5), and one Sb(7) atom to form distorted EuSb5 trigonal bipyramids that share  a cornercorner with one Eu(4)Sb4 tetrahedra, corners with three equivalent Eu(9)Sb5 trigonal bipyramids, corners with two equivalent Eu(3)Sb4 trigonal pyramids,  an edgeedge with one Eu(8)Sb5 trigonal bipyramid,  an edgeedge with one Eu(9)Sb5 trigonal bipyramid, and  an edgeedge with one Eu(3)Sb4 trigonal pyramid. In the ninth Eu site, Eu(9) is bonded to one Sb(1), one Sb(3), one Sb(4), one Sb(6), and one Sb(7) atom to form distorted EuSb5 trigonal bipyramids that share  a cornercorner with one Eu(4)Sb4 tetrahedra, corners with three equivalent Eu(8)Sb5 trigonal bipyramids, corners with two equivalent Eu(3)Sb4 trigonal pyramids,  an edgeedge with one Eu(8)Sb5 trigonal bipyramid,  an edgeedge with one Eu(9)Sb5 trigonal bipyramid, and  an edgeedge with one Eu(3)Sb4 trigonal pyramid. There are seven inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 8-coordinate geometry to one Eu(1), one Eu(2), one Eu(3), one Eu(4), one Eu(5), one Eu(6), one Eu(8), and one Eu(9) atom. In the second Sb site, Sb(2) is bonded in a 8-coordinate geometry to one Eu(4), one Eu(5), one Eu(6), one Eu(7), two equivalent Eu(1), and two equivalent Eu(2) atoms. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to one Eu(1), one Eu(2), one Eu(3), one Eu(5), one Eu(6), one Eu(7), one Eu(8), and one Eu(9) atom. In the fourth Sb site, Sb(4) is bonded in a 6-coordinate geometry to one Eu(5), one Eu(6), one Eu(8), one Eu(9), and two equivalent Eu(3) atoms. In the fifth Sb site, Sb(5) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(6), and two equivalent Eu(8) atoms. In the sixth Sb site, Sb(6) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(5), and two equivalent Eu(9) atoms. In the seventh Sb site, Sb(7) is bonded in a body-centered cubic geometry to two equivalent Eu(5), two equivalent Eu(6), two equivalent Eu(8), and two equivalent Eu(9) atoms. is represented by the CIF card [CIF]
data_Eu16Sb11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.761
_cell_length_b   12.741
_cell_length_c   12.720
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1905.964
_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
  Eu  Eu0  1  0.999  0.912  0.207  1.0
  Eu  Eu1  1  0.001  0.588  0.707  1.0
  Eu  Eu2  1  0.999  0.088  0.793  1.0
  Eu  Eu3  1  0.001  0.412  0.293  1.0
  Eu  Eu4  1  0.002  0.793  0.911  1.0
  Eu  Eu5  1  0.998  0.707  0.411  1.0
  Eu  Eu6  1  0.002  0.207  0.089  1.0
  Eu  Eu7  1  0.998  0.293  0.589  1.0
  Eu  Eu8  1  0.499  0.866  0.366  1.0
  Eu  Eu9  1  0.501  0.634  0.866  1.0
  Eu  Eu10  1  0.499  0.134  0.634  1.0
  Eu  Eu11  1  0.501  0.366  0.134  1.0
  Eu  Eu12  1  0.147  0.000  0.500  1.0
  Eu  Eu13  1  0.853  0.500  0.000  1.0
  Eu  Eu14  1  0.293  0.791  0.074  1.0
  Eu  Eu15  1  0.707  0.709  0.574  1.0
  Eu  Eu16  1  0.293  0.209  0.926  1.0
  Eu  Eu17  1  0.707  0.291  0.426  1.0
  Eu  Eu18  1  0.707  0.926  0.792  1.0
  Eu  Eu19  1  0.293  0.574  0.292  1.0
  Eu  Eu20  1  0.707  0.074  0.208  1.0
  Eu  Eu21  1  0.293  0.426  0.708  1.0
  Eu  Eu22  1  0.791  0.000  0.500  1.0
  Eu  Eu23  1  0.209  0.500  0.000  1.0
  Eu  Eu24  1  0.312  0.295  0.431  1.0
  Eu  Eu25  1  0.688  0.205  0.931  1.0
  Eu  Eu26  1  0.312  0.705  0.569  1.0
  Eu  Eu27  1  0.688  0.795  0.069  1.0
  Eu  Eu28  1  0.682  0.568  0.300  1.0
  Eu  Eu29  1  0.318  0.932  0.800  1.0
  Eu  Eu30  1  0.682  0.432  0.700  1.0
  Eu  Eu31  1  0.318  0.068  0.200  1.0
  Sb  Sb32  1  0.234  0.833  0.332  1.0
  Sb  Sb33  1  0.766  0.667  0.832  1.0
  Sb  Sb34  1  0.234  0.167  0.668  1.0
  Sb  Sb35  1  0.766  0.333  0.168  1.0
  Sb  Sb36  1  0.031  0.644  0.144  1.0
  Sb  Sb37  1  0.969  0.856  0.644  1.0
  Sb  Sb38  1  0.031  0.356  0.856  1.0
  Sb  Sb39  1  0.969  0.144  0.356  1.0
  Sb  Sb40  1  0.763  0.819  0.321  1.0
  Sb  Sb41  1  0.237  0.681  0.821  1.0
  Sb  Sb42  1  0.763  0.181  0.679  1.0
  Sb  Sb43  1  0.237  0.319  0.179  1.0
  Sb  Sb44  1  0.489  0.624  0.124  1.0
  Sb  Sb45  1  0.511  0.876  0.624  1.0
  Sb  Sb46  1  0.489  0.376  0.876  1.0
  Sb  Sb47  1  0.511  0.124  0.376  1.0
  Sb  Sb48  1  0.148  0.500  0.500  1.0
  Sb  Sb49  1  0.852  0.000  0.000  1.0
  Sb  Sb50  1  0.847  0.500  0.500  1.0
  Sb  Sb51  1  0.153  0.000  0.000  1.0
  Sb  Sb52  1  0.497  0.500  0.500  1.0
  Sb  Sb53  1  0.503  0.000  0.000  1.0
[/CIF]
.
The material structure described by Eu16Sb11 crystallizes in the orthorhombic P2_12_12 space group. There are nine inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 6-coordinate geometry to one Sb(1), one Sb(3), one Sb(5), one Sb(6), and two equivalent Sb(2) atoms. In the second Eu site, Eu(2) is bonded in a 6-coordinate geometry to one Sb(1), one Sb(3), one Sb(5), one Sb(6), and two equivalent Sb(2) atoms. In the third Eu site, Eu(3) is bonded to one Sb(1), one Sb(3), and two equivalent Sb(4) atoms to form distorted EuSb4 trigonal pyramids that share  a cornercorner with one Eu(4)Sb4 tetrahedra, corners with two equivalent Eu(8)Sb5 trigonal bipyramids, corners with two equivalent Eu(9)Sb5 trigonal bipyramids,  an edgeedge with one Eu(8)Sb5 trigonal bipyramid,  an edgeedge with one Eu(9)Sb5 trigonal bipyramid, and  an edgeedge with one Eu(3)Sb4 trigonal pyramid. In the fourth Eu site, Eu(4) is bonded to two equivalent Sb(1) and two equivalent Sb(2) atoms to form distorted EuSb4 tetrahedra that share corners with two equivalent Eu(8)Sb5 trigonal bipyramids, corners with two equivalent Eu(9)Sb5 trigonal bipyramids, and corners with two equivalent Eu(3)Sb4 trigonal pyramids. In the fifth Eu site, Eu(5) is bonded in a 6-coordinate geometry to one Sb(1), one Sb(2), one Sb(3), one Sb(4), one Sb(6), and one Sb(7) atom. In the sixth Eu site, Eu(6) is bonded in a 6-coordinate geometry to one Sb(1), one Sb(2), one Sb(3), one Sb(4), one Sb(5), and one Sb(7) atom. In the seventh Eu site, Eu(7) is bonded in a distorted see-saw-like geometry to two equivalent Sb(2) and two equivalent Sb(3) atoms. In the eighth Eu site, Eu(8) is bonded to one Sb(1), one Sb(3), one Sb(4), one Sb(5), and one Sb(7) atom to form distorted EuSb5 trigonal bipyramids that share  a cornercorner with one Eu(4)Sb4 tetrahedra, corners with three equivalent Eu(9)Sb5 trigonal bipyramids, corners with two equivalent Eu(3)Sb4 trigonal pyramids,  an edgeedge with one Eu(8)Sb5 trigonal bipyramid,  an edgeedge with one Eu(9)Sb5 trigonal bipyramid, and  an edgeedge with one Eu(3)Sb4 trigonal pyramid. In the ninth Eu site, Eu(9) is bonded to one Sb(1), one Sb(3), one Sb(4), one Sb(6), and one Sb(7) atom to form distorted EuSb5 trigonal bipyramids that share  a cornercorner with one Eu(4)Sb4 tetrahedra, corners with three equivalent Eu(8)Sb5 trigonal bipyramids, corners with two equivalent Eu(3)Sb4 trigonal pyramids,  an edgeedge with one Eu(8)Sb5 trigonal bipyramid,  an edgeedge with one Eu(9)Sb5 trigonal bipyramid, and  an edgeedge with one Eu(3)Sb4 trigonal pyramid. There are seven inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 8-coordinate geometry to one Eu(1), one Eu(2), one Eu(3), one Eu(4), one Eu(5), one Eu(6), one Eu(8), and one Eu(9) atom. In the second Sb site, Sb(2) is bonded in a 8-coordinate geometry to one Eu(4), one Eu(5), one Eu(6), one Eu(7), two equivalent Eu(1), and two equivalent Eu(2) atoms. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to one Eu(1), one Eu(2), one Eu(3), one Eu(5), one Eu(6), one Eu(7), one Eu(8), and one Eu(9) atom. In the fourth Sb site, Sb(4) is bonded in a 6-coordinate geometry to one Eu(5), one Eu(6), one Eu(8), one Eu(9), and two equivalent Eu(3) atoms. In the fifth Sb site, Sb(5) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(6), and two equivalent Eu(8) atoms. In the sixth Sb site, Sb(6) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(5), and two equivalent Eu(9) atoms. In the seventh Sb site, Sb(7) is bonded in a body-centered cubic geometry to two equivalent Eu(5), two equivalent Eu(6), two equivalent Eu(8), and two equivalent Eu(9) atoms. is represented by the CIF card [CIF]
data_Eu16Sb11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.761
_cell_length_b   12.741
_cell_length_c   12.720
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1905.964
_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
  Eu  Eu0  1  0.999  0.912  0.207  1.0
  Eu  Eu1  1  0.001  0.588  0.707  1.0
  Eu  Eu2  1  0.999  0.088  0.793  1.0
  Eu  Eu3  1  0.001  0.412  0.293  1.0
  Eu  Eu4  1  0.002  0.793  0.911  1.0
  Eu  Eu5  1  0.998  0.707  0.411  1.0
  Eu  Eu6  1  0.002  0.207  0.089  1.0
  Eu  Eu7  1  0.998  0.293  0.589  1.0
  Eu  Eu8  1  0.499  0.866  0.366  1.0
  Eu  Eu9  1  0.501  0.634  0.866  1.0
  Eu  Eu10  1  0.499  0.134  0.634  1.0
  Eu  Eu11  1  0.501  0.366  0.134  1.0
  Eu  Eu12  1  0.147  0.000  0.500  1.0
  Eu  Eu13  1  0.853  0.500  0.000  1.0
  Eu  Eu14  1  0.293  0.791  0.074  1.0
  Eu  Eu15  1  0.707  0.709  0.574  1.0
  Eu  Eu16  1  0.293  0.209  0.926  1.0
  Eu  Eu17  1  0.707  0.291  0.426  1.0
  Eu  Eu18  1  0.707  0.926  0.792  1.0
  Eu  Eu19  1  0.293  0.574  0.292  1.0
  Eu  Eu20  1  0.707  0.074  0.208  1.0
  Eu  Eu21  1  0.293  0.426  0.708  1.0
  Eu  Eu22  1  0.791  0.000  0.500  1.0
  Eu  Eu23  1  0.209  0.500  0.000  1.0
  Eu  Eu24  1  0.312  0.295  0.431  1.0
  Eu  Eu25  1  0.688  0.205  0.931  1.0
  Eu  Eu26  1  0.312  0.705  0.569  1.0
  Eu  Eu27  1  0.688  0.795  0.069  1.0
  Eu  Eu28  1  0.682  0.568  0.300  1.0
  Eu  Eu29  1  0.318  0.932  0.800  1.0
  Eu  Eu30  1  0.682  0.432  0.700  1.0
  Eu  Eu31  1  0.318  0.068  0.200  1.0
  Sb  Sb32  1  0.234  0.833  0.332  1.0
  Sb  Sb33  1  0.766  0.667  0.832  1.0
  Sb  Sb34  1  0.234  0.167  0.668  1.0
  Sb  Sb35  1  0.766  0.333  0.168  1.0
  Sb  Sb36  1  0.031  0.644  0.144  1.0
  Sb  Sb37  1  0.969  0.856  0.644  1.0
  Sb  Sb38  1  0.031  0.356  0.856  1.0
  Sb  Sb39  1  0.969  0.144  0.356  1.0
  Sb  Sb40  1  0.763  0.819  0.321  1.0
  Sb  Sb41  1  0.237  0.681  0.821  1.0
  Sb  Sb42  1  0.763  0.181  0.679  1.0
  Sb  Sb43  1  0.237  0.319  0.179  1.0
  Sb  Sb44  1  0.489  0.624  0.124  1.0
  Sb  Sb45  1  0.511  0.876  0.624  1.0
  Sb  Sb46  1  0.489  0.376  0.876  1.0
  Sb  Sb47  1  0.511  0.124  0.376  1.0
  Sb  Sb48  1  0.148  0.500  0.500  1.0
  Sb  Sb49  1  0.852  0.000  0.000  1.0
  Sb  Sb50  1  0.847  0.500  0.500  1.0
  Sb  Sb51  1  0.153  0.000  0.000  1.0
  Sb  Sb52  1  0.497  0.500  0.500  1.0
  Sb  Sb53  1  0.503  0.000  0.000  1.0
[/CIF]
.