The compound described by Tb2Se2O7 is Zircon-like structured and crystallizes in the tetragonal P4_2/ncm space group. Tb(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Se(1) is bonded in a trigonal non-coplanar geometry to one O(3) and two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(2) is bonded to four equivalent Tb(1) atoms to form edge-sharing OTb4 tetrahedra. In the second O site, O(3) is bonded in a trigonal planar geometry to two equivalent Tb(1) and one Se(1) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Tb(1) and one Se(1) atom. is represented by the CIF card [CIF]
data_Tb2Se2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.596
_cell_length_b   10.596
_cell_length_c   5.218
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   585.863
_cell_formula_units_Z   4
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  0.122  0.878  0.750  1.0
  Tb  Tb1  1  0.378  0.378  0.250  1.0
  Tb  Tb2  1  0.622  0.622  0.250  1.0
  Tb  Tb3  1  0.878  0.122  0.750  1.0
  Tb  Tb4  1  0.378  0.622  0.750  1.0
  Tb  Tb5  1  0.122  0.122  0.250  1.0
  Tb  Tb6  1  0.878  0.878  0.250  1.0
  Tb  Tb7  1  0.622  0.378  0.750  1.0
  Se  Se8  1  0.622  0.122  0.214  1.0
  Se  Se9  1  0.378  0.878  0.214  1.0
  Se  Se10  1  0.378  0.122  0.714  1.0
  Se  Se11  1  0.622  0.878  0.714  1.0
  Se  Se12  1  0.122  0.622  0.286  1.0
  Se  Se13  1  0.122  0.378  0.786  1.0
  Se  Se14  1  0.878  0.622  0.786  1.0
  Se  Se15  1  0.878  0.378  0.286  1.0
  O  O16  1  0.752  0.930  0.877  1.0
  O  O17  1  0.248  0.070  0.877  1.0
  O  O18  1  0.570  0.252  0.377  1.0
  O  O19  1  0.430  0.748  0.377  1.0
  O  O20  1  0.930  0.752  0.623  1.0
  O  O21  1  0.252  0.570  0.123  1.0
  O  O22  1  0.748  0.430  0.123  1.0
  O  O23  1  0.070  0.248  0.623  1.0
  O  O24  1  0.748  0.570  0.623  1.0
  O  O25  1  0.252  0.430  0.623  1.0
  O  O26  1  0.930  0.248  0.123  1.0
  O  O27  1  0.070  0.752  0.123  1.0
  O  O28  1  0.570  0.748  0.877  1.0
  O  O29  1  0.248  0.930  0.377  1.0
  O  O30  1  0.752  0.070  0.377  1.0
  O  O31  1  0.430  0.252  0.877  1.0
  O  O32  1  0.000  0.000  0.500  1.0
  O  O33  1  0.500  0.500  0.000  1.0
  O  O34  1  0.500  0.500  0.500  1.0
  O  O35  1  0.000  0.000  0.000  1.0
  O  O36  1  0.814  0.314  0.558  1.0
  O  O37  1  0.814  0.686  0.058  1.0
  O  O38  1  0.186  0.314  0.058  1.0
  O  O39  1  0.186  0.686  0.558  1.0
  O  O40  1  0.686  0.814  0.442  1.0
  O  O41  1  0.314  0.186  0.442  1.0
  O  O42  1  0.314  0.814  0.942  1.0
  O  O43  1  0.686  0.186  0.942  1.0
[/CIF]
.
The compound described by Tb2Se2O7 is Zircon-like structured and crystallizes in the tetragonal P4_2/ncm space group. Tb(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Se(1) is bonded in a trigonal non-coplanar geometry to one O(3) and two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(2) is bonded to four equivalent Tb(1) atoms to form edge-sharing OTb4 tetrahedra. In the second O site, O(3) is bonded in a trigonal planar geometry to two equivalent Tb(1) and one Se(1) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Tb(1) and one Se(1) atom. is represented by the CIF card [CIF]
data_Tb2Se2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.596
_cell_length_b   10.596
_cell_length_c   5.218
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   585.863
_cell_formula_units_Z   4
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  0.122  0.878  0.750  1.0
  Tb  Tb1  1  0.378  0.378  0.250  1.0
  Tb  Tb2  1  0.622  0.622  0.250  1.0
  Tb  Tb3  1  0.878  0.122  0.750  1.0
  Tb  Tb4  1  0.378  0.622  0.750  1.0
  Tb  Tb5  1  0.122  0.122  0.250  1.0
  Tb  Tb6  1  0.878  0.878  0.250  1.0
  Tb  Tb7  1  0.622  0.378  0.750  1.0
  Se  Se8  1  0.622  0.122  0.214  1.0
  Se  Se9  1  0.378  0.878  0.214  1.0
  Se  Se10  1  0.378  0.122  0.714  1.0
  Se  Se11  1  0.622  0.878  0.714  1.0
  Se  Se12  1  0.122  0.622  0.286  1.0
  Se  Se13  1  0.122  0.378  0.786  1.0
  Se  Se14  1  0.878  0.622  0.786  1.0
  Se  Se15  1  0.878  0.378  0.286  1.0
  O  O16  1  0.752  0.930  0.877  1.0
  O  O17  1  0.248  0.070  0.877  1.0
  O  O18  1  0.570  0.252  0.377  1.0
  O  O19  1  0.430  0.748  0.377  1.0
  O  O20  1  0.930  0.752  0.623  1.0
  O  O21  1  0.252  0.570  0.123  1.0
  O  O22  1  0.748  0.430  0.123  1.0
  O  O23  1  0.070  0.248  0.623  1.0
  O  O24  1  0.748  0.570  0.623  1.0
  O  O25  1  0.252  0.430  0.623  1.0
  O  O26  1  0.930  0.248  0.123  1.0
  O  O27  1  0.070  0.752  0.123  1.0
  O  O28  1  0.570  0.748  0.877  1.0
  O  O29  1  0.248  0.930  0.377  1.0
  O  O30  1  0.752  0.070  0.377  1.0
  O  O31  1  0.430  0.252  0.877  1.0
  O  O32  1  0.000  0.000  0.500  1.0
  O  O33  1  0.500  0.500  0.000  1.0
  O  O34  1  0.500  0.500  0.500  1.0
  O  O35  1  0.000  0.000  0.000  1.0
  O  O36  1  0.814  0.314  0.558  1.0
  O  O37  1  0.814  0.686  0.058  1.0
  O  O38  1  0.186  0.314  0.058  1.0
  O  O39  1  0.186  0.686  0.558  1.0
  O  O40  1  0.686  0.814  0.442  1.0
  O  O41  1  0.314  0.186  0.442  1.0
  O  O42  1  0.314  0.814  0.942  1.0
  O  O43  1  0.686  0.186  0.942  1.0
[/CIF]
.