The crystal structure described by Tb11O20 crystallizes in the triclinic P-1 space group. There are six inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to one O(1), one O(4), one O(7), one O(8), one O(9), and two equivalent O(2) atoms to form a mixture of distorted edge and corner-sharing TbO7 pentagonal bipyramids. In the second Tb site, Tb(2) is bonded in a body-centered cubic geometry to one O(10), one O(3), one O(4), one O(7), one O(8), one O(9), and two equivalent O(6) atoms. In the third Tb site, Tb(3) is bonded in a 7-coordinate geometry to one O(3), one O(6), one O(8), two equivalent O(10), and two equivalent O(4) atoms. In the fourth Tb site, Tb(4) is bonded to one O(1), one O(10), one O(3), one O(5), one O(6), one O(8), and one O(9) atom to form a mixture of distorted edge and corner-sharing TbO7 hexagonal pyramids. In the fifth Tb site, Tb(5) is bonded to one O(2), one O(3), one O(7), two equivalent O(1), and two equivalent O(5) atoms to form a mixture of distorted edge and corner-sharing TbO7 hexagonal pyramids. In the sixth Tb site, Tb(6) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Tb(1), one Tb(4), and two equivalent Tb(5) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the second O site, O(2) is bonded to one Tb(5), one Tb(6), and two equivalent Tb(1) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the third O site, O(3) is bonded to one Tb(2), one Tb(3), one Tb(4), and one Tb(5) atom to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the fourth O site, O(4) is bonded to one Tb(1), one Tb(2), and two equivalent Tb(3) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the fifth O site, O(5) is bonded to one Tb(4), one Tb(6), and two equivalent Tb(5) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the sixth O site, O(6) is bonded to one Tb(3), one Tb(4), and two equivalent Tb(2) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the seventh O site, O(7) is bonded to one Tb(1), one Tb(2), one Tb(5), and one Tb(6) atom to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the eighth O site, O(8) is bonded to one Tb(1), one Tb(2), one Tb(3), and one Tb(4) atom to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the ninth O site, O(9) is bonded to one Tb(1), one Tb(2), one Tb(4), and one Tb(6) atom to form a mixture of distorted edge and corner-sharing OTb4 tetrahedra. In the tenth O site, O(10) is bonded to one Tb(2), one Tb(4), and two equivalent Tb(3) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. is represented by the CIF file [CIF]
data_Tb11O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.563
_cell_length_b   6.691
_cell_length_c   10.297
_cell_angle_alpha   94.037
_cell_angle_beta   92.936
_cell_angle_gamma   98.919
_symmetry_Int_Tables_number   1
_cell_volume   444.714
_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
  Tb  Tb0  1  0.128  0.549  0.173  1.0
  Tb  Tb1  1  0.818  0.889  0.631  1.0
  Tb  Tb2  1  0.729  0.364  0.479  1.0
  Tb  Tb3  1  0.370  0.145  0.724  1.0
  Tb  Tb4  1  0.872  0.451  0.827  1.0
  Tb  Tb5  1  0.182  0.111  0.369  1.0
  Tb  Tb6  1  0.469  0.732  0.924  1.0
  Tb  Tb7  1  0.271  0.636  0.521  1.0
  Tb  Tb8  1  0.630  0.855  0.276  1.0
  Tb  Tb9  1  0.000  0.000  0.000  1.0
  Tb  Tb10  1  0.531  0.268  0.076  1.0
  O  O11  1  0.529  0.409  0.872  1.0
  O  O12  1  0.878  0.336  0.038  1.0
  O  O13  1  0.540  0.183  0.296  1.0
  O  O14  1  0.460  0.817  0.704  1.0
  O  O15  1  0.035  0.427  0.370  1.0
  O  O16  1  0.669  0.966  0.070  1.0
  O  O17  1  0.848  0.057  0.432  1.0
  O  O18  1  0.471  0.591  0.128  1.0
  O  O19  1  0.794  0.781  0.839  1.0
  O  O20  1  0.152  0.943  0.568  1.0
  O  O21  1  0.287  0.799  0.331  1.0
  O  O22  1  0.959  0.833  0.201  1.0
  O  O23  1  0.629  0.676  0.462  1.0
  O  O24  1  0.206  0.219  0.161  1.0
  O  O25  1  0.371  0.324  0.538  1.0
  O  O26  1  0.122  0.664  0.962  1.0
  O  O27  1  0.041  0.167  0.799  1.0
  O  O28  1  0.965  0.573  0.630  1.0
  O  O29  1  0.713  0.201  0.669  1.0
  O  O30  1  0.331  0.034  0.930  1.0
[/CIF]
.
The crystal structure described by Tb11O20 crystallizes in the triclinic P-1 space group. There are six inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to one O(1), one O(4), one O(7), one O(8), one O(9), and two equivalent O(2) atoms to form a mixture of distorted edge and corner-sharing TbO7 pentagonal bipyramids. In the second Tb site, Tb(2) is bonded in a body-centered cubic geometry to one O(10), one O(3), one O(4), one O(7), one O(8), one O(9), and two equivalent O(6) atoms. In the third Tb site, Tb(3) is bonded in a 7-coordinate geometry to one O(3), one O(6), one O(8), two equivalent O(10), and two equivalent O(4) atoms. In the fourth Tb site, Tb(4) is bonded to one O(1), one O(10), one O(3), one O(5), one O(6), one O(8), and one O(9) atom to form a mixture of distorted edge and corner-sharing TbO7 hexagonal pyramids. In the fifth Tb site, Tb(5) is bonded to one O(2), one O(3), one O(7), two equivalent O(1), and two equivalent O(5) atoms to form a mixture of distorted edge and corner-sharing TbO7 hexagonal pyramids. In the sixth Tb site, Tb(6) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Tb(1), one Tb(4), and two equivalent Tb(5) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the second O site, O(2) is bonded to one Tb(5), one Tb(6), and two equivalent Tb(1) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the third O site, O(3) is bonded to one Tb(2), one Tb(3), one Tb(4), and one Tb(5) atom to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the fourth O site, O(4) is bonded to one Tb(1), one Tb(2), and two equivalent Tb(3) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the fifth O site, O(5) is bonded to one Tb(4), one Tb(6), and two equivalent Tb(5) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the sixth O site, O(6) is bonded to one Tb(3), one Tb(4), and two equivalent Tb(2) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the seventh O site, O(7) is bonded to one Tb(1), one Tb(2), one Tb(5), and one Tb(6) atom to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the eighth O site, O(8) is bonded to one Tb(1), one Tb(2), one Tb(3), and one Tb(4) atom to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the ninth O site, O(9) is bonded to one Tb(1), one Tb(2), one Tb(4), and one Tb(6) atom to form a mixture of distorted edge and corner-sharing OTb4 tetrahedra. In the tenth O site, O(10) is bonded to one Tb(2), one Tb(4), and two equivalent Tb(3) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. is represented by the CIF file [CIF]
data_Tb11O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.563
_cell_length_b   6.691
_cell_length_c   10.297
_cell_angle_alpha   94.037
_cell_angle_beta   92.936
_cell_angle_gamma   98.919
_symmetry_Int_Tables_number   1
_cell_volume   444.714
_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
  Tb  Tb0  1  0.128  0.549  0.173  1.0
  Tb  Tb1  1  0.818  0.889  0.631  1.0
  Tb  Tb2  1  0.729  0.364  0.479  1.0
  Tb  Tb3  1  0.370  0.145  0.724  1.0
  Tb  Tb4  1  0.872  0.451  0.827  1.0
  Tb  Tb5  1  0.182  0.111  0.369  1.0
  Tb  Tb6  1  0.469  0.732  0.924  1.0
  Tb  Tb7  1  0.271  0.636  0.521  1.0
  Tb  Tb8  1  0.630  0.855  0.276  1.0
  Tb  Tb9  1  0.000  0.000  0.000  1.0
  Tb  Tb10  1  0.531  0.268  0.076  1.0
  O  O11  1  0.529  0.409  0.872  1.0
  O  O12  1  0.878  0.336  0.038  1.0
  O  O13  1  0.540  0.183  0.296  1.0
  O  O14  1  0.460  0.817  0.704  1.0
  O  O15  1  0.035  0.427  0.370  1.0
  O  O16  1  0.669  0.966  0.070  1.0
  O  O17  1  0.848  0.057  0.432  1.0
  O  O18  1  0.471  0.591  0.128  1.0
  O  O19  1  0.794  0.781  0.839  1.0
  O  O20  1  0.152  0.943  0.568  1.0
  O  O21  1  0.287  0.799  0.331  1.0
  O  O22  1  0.959  0.833  0.201  1.0
  O  O23  1  0.629  0.676  0.462  1.0
  O  O24  1  0.206  0.219  0.161  1.0
  O  O25  1  0.371  0.324  0.538  1.0
  O  O26  1  0.122  0.664  0.962  1.0
  O  O27  1  0.041  0.167  0.799  1.0
  O  O28  1  0.965  0.573  0.630  1.0
  O  O29  1  0.713  0.201  0.669  1.0
  O  O30  1  0.331  0.034  0.930  1.0
[/CIF]
.