The material structure described by Th2Tb2O5 crystallizes in the tetragonal P4/mmm space group. Th(1) is bonded in a distorted pentagonal planar geometry to four equivalent Tb(1), one O(2), and four equivalent O(1) atoms. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to eight equivalent Th(1) and four equivalent Tb(1) atoms to form TbTb4Th8 cuboctahedra that share corners with four equivalent Tb(1)Tb4Th8 cuboctahedra, corners with sixteen equivalent O(1)Tb2Th2 tetrahedra, edges with eight equivalent O(1)Tb2Th2 tetrahedra, and faces with eight equivalent Tb(1)Tb4Th8 cuboctahedra. In the second Tb site, Tb(2) is bonded in a distorted body-centered cubic geometry to eight equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Th(1) and two equivalent Tb(2) atoms to form distorted OTb2Th2 tetrahedra that share corners with four equivalent Tb(1)Tb4Th8 cuboctahedra, corners with ten equivalent O(1)Tb2Th2 tetrahedra, edges with two equivalent Tb(1)Tb4Th8 cuboctahedra, and edges with five equivalent O(1)Tb2Th2 tetrahedra. In the second O site, O(2) is bonded in a linear geometry to two equivalent Th(1) atoms. is represented by the CIF file [CIF]
data_Tb2Th2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.261
_cell_length_b   4.261
_cell_length_c   10.665
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   193.655
_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  0.000  0.000  0.000  1.0
  Tb  Tb1  1  0.000  0.000  0.500  1.0
  Th  Th2  1  0.500  0.500  0.290  1.0
  Th  Th3  1  0.500  0.500  0.710  1.0
  O  O4  1  0.500  0.000  0.353  1.0
  O  O5  1  0.500  0.000  0.647  1.0
  O  O6  1  0.500  0.500  0.500  1.0
  O  O7  1  0.000  0.500  0.353  1.0
  O  O8  1  0.000  0.500  0.647  1.0
[/CIF]
.
The material structure described by Th2Tb2O5 crystallizes in the tetragonal P4/mmm space group. Th(1) is bonded in a distorted pentagonal planar geometry to four equivalent Tb(1), one O(2), and four equivalent O(1) atoms. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to eight equivalent Th(1) and four equivalent Tb(1) atoms to form TbTb4Th8 cuboctahedra that share corners with four equivalent Tb(1)Tb4Th8 cuboctahedra, corners with sixteen equivalent O(1)Tb2Th2 tetrahedra, edges with eight equivalent O(1)Tb2Th2 tetrahedra, and faces with eight equivalent Tb(1)Tb4Th8 cuboctahedra. In the second Tb site, Tb(2) is bonded in a distorted body-centered cubic geometry to eight equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Th(1) and two equivalent Tb(2) atoms to form distorted OTb2Th2 tetrahedra that share corners with four equivalent Tb(1)Tb4Th8 cuboctahedra, corners with ten equivalent O(1)Tb2Th2 tetrahedra, edges with two equivalent Tb(1)Tb4Th8 cuboctahedra, and edges with five equivalent O(1)Tb2Th2 tetrahedra. In the second O site, O(2) is bonded in a linear geometry to two equivalent Th(1) atoms. is represented by the CIF file [CIF]
data_Tb2Th2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.261
_cell_length_b   4.261
_cell_length_c   10.665
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   193.655
_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  0.000  0.000  0.000  1.0
  Tb  Tb1  1  0.000  0.000  0.500  1.0
  Th  Th2  1  0.500  0.500  0.290  1.0
  Th  Th3  1  0.500  0.500  0.710  1.0
  O  O4  1  0.500  0.000  0.353  1.0
  O  O5  1  0.500  0.000  0.647  1.0
  O  O6  1  0.500  0.500  0.500  1.0
  O  O7  1  0.000  0.500  0.353  1.0
  O  O8  1  0.000  0.500  0.647  1.0
[/CIF]
.