The material structure described by Tb3SbO7 crystallizes in the triclinic P-1 space group. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to one O(3), one O(4), one O(7), two equivalent O(2), and two equivalent O(6) atoms to form distorted TbO7 hexagonal pyramids that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one Tb(3)O7 pentagonal bipyramid, edges with two equivalent Tb(1)O7 hexagonal pyramids,  an edgeedge with one Sb(1)O6 octahedra, and edges with two equivalent Tb(3)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-49°. In the second Tb site, Tb(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(5), one O(6), two equivalent O(4), and two equivalent O(7) atoms. In the third Tb site, Tb(3) is bonded to one O(5), one O(6), one O(7), two equivalent O(1), and two equivalent O(3) atoms to form distorted TbO7 pentagonal bipyramids that share  a cornercorner with one Tb(1)O7 hexagonal pyramid,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra, edges with two equivalent Tb(1)O7 hexagonal pyramids,  an edgeedge with one Sb(1)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, and edges with two equivalent Tb(3)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 44-45°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form SbO6 octahedra that share corners with two equivalent Tb(1)O7 hexagonal pyramids, corners with two equivalent Sb(2)O6 octahedra, corners with two equivalent Tb(3)O7 pentagonal bipyramids, edges with two equivalent Tb(1)O7 hexagonal pyramids, and edges with two equivalent Tb(3)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 40°. In the second Sb site, Sb(2) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form SbO6 octahedra that share corners with two equivalent Tb(1)O7 hexagonal pyramids, corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Tb(3)O7 pentagonal bipyramids, and edges with two equivalent Tb(3)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 40°. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Tb(2), two equivalent Tb(3), and one Sb(2) atom to form distorted OTb3Sb trigonal pyramids that share  a cornercorner with one O(6)Tb4 tetrahedra, corners with two equivalent O(4)Tb3Sb tetrahedra, corners with two equivalent O(7)Tb4 tetrahedra,  a cornercorner with one O(1)Tb3Sb trigonal pyramid, corners with four equivalent O(3)Tb3Sb trigonal pyramids,  an edgeedge with one O(4)Tb3Sb tetrahedra,  an edgeedge with one O(6)Tb4 tetrahedra,  an edgeedge with one O(7)Tb4 tetrahedra, and  an edgeedge with one O(1)Tb3Sb trigonal pyramid. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Tb(2), two equivalent Tb(1), and one Sb(1) atom. In the third O site, O(3) is bonded to one Tb(1), two equivalent Tb(3), and one Sb(1) atom to form distorted OTb3Sb trigonal pyramids that share  a cornercorner with one O(4)Tb3Sb tetrahedra,  a cornercorner with one O(7)Tb4 tetrahedra, corners with two equivalent O(6)Tb4 tetrahedra,  a cornercorner with one O(3)Tb3Sb trigonal pyramid, corners with four equivalent O(1)Tb3Sb trigonal pyramids,  an edgeedge with one O(6)Tb4 tetrahedra,  an edgeedge with one O(7)Tb4 tetrahedra, and  an edgeedge with one O(3)Tb3Sb trigonal pyramid. In the fourth O site, O(4) is bonded to one Tb(1), two equivalent Tb(2), and one Sb(2) atom to form distorted OTb3Sb tetrahedra that share  a cornercorner with one O(4)Tb3Sb tetrahedra, corners with three equivalent O(7)Tb4 tetrahedra, corners with four equivalent O(6)Tb4 tetrahedra,  a cornercorner with one O(3)Tb3Sb trigonal pyramid, corners with two equivalent O(1)Tb3Sb trigonal pyramids,  an edgeedge with one O(4)Tb3Sb tetrahedra,  an edgeedge with one O(7)Tb4 tetrahedra, and  an edgeedge with one O(1)Tb3Sb trigonal pyramid. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Tb(2), one Tb(3), one Sb(1), and one Sb(2) atom. In the sixth O site, O(6) is bonded to one Tb(2), one Tb(3), and two equivalent Tb(1) atoms to form OTb4 tetrahedra that share corners with three equivalent O(7)Tb4 tetrahedra, corners with four equivalent O(4)Tb3Sb tetrahedra,  a cornercorner with one O(1)Tb3Sb trigonal pyramid, corners with two equivalent O(3)Tb3Sb trigonal pyramids,  an edgeedge with one O(6)Tb4 tetrahedra,  an edgeedge with one O(7)Tb4 tetrahedra,  an edgeedge with one O(1)Tb3Sb trigonal pyramid, and  an edgeedge with one O(3)Tb3Sb trigonal pyramid. In the seventh O site, O(7) is bonded to one Tb(1), one Tb(3), and two equivalent Tb(2) atoms to form OTb4 tetrahedra that share corners with three equivalent O(4)Tb3Sb tetrahedra, corners with three equivalent O(6)Tb4 tetrahedra,  a cornercorner with one O(3)Tb3Sb trigonal pyramid, corners with two equivalent O(1)Tb3Sb trigonal pyramids,  an edgeedge with one O(4)Tb3Sb tetrahedra,  an edgeedge with one O(6)Tb4 tetrahedra,  an edgeedge with one O(7)Tb4 tetrahedra,  an edgeedge with one O(1)Tb3Sb trigonal pyramid, and  an edgeedge with one O(3)Tb3Sb trigonal pyramid. is represented by the CIF file [CIF]
data_Tb3SbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.395
_cell_length_b   6.448
_cell_length_c   7.530
_cell_angle_alpha   106.806
_cell_angle_beta   89.823
_cell_angle_gamma   98.016
_symmetry_Int_Tables_number   1
_cell_volume   294.142
_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
  Tb  Tb0  1  0.736  0.465  0.117  1.0
  Tb  Tb1  1  0.738  0.473  0.614  1.0
  Tb  Tb2  1  0.541  0.995  0.748  1.0
  Tb  Tb3  1  0.459  0.005  0.252  1.0
  Tb  Tb4  1  0.262  0.527  0.386  1.0
  Tb  Tb5  1  0.264  0.535  0.883  1.0
  Sb  Sb6  1  0.000  0.000  0.000  1.0
  Sb  Sb7  1  0.000  0.000  0.500  1.0
  O  O8  1  0.712  0.064  0.484  1.0
  O  O9  1  0.925  0.680  0.954  1.0
  O  O10  1  0.710  0.066  0.047  1.0
  O  O11  1  0.928  0.671  0.389  1.0
  O  O12  1  0.903  0.934  0.733  1.0
  O  O13  1  0.559  0.353  0.834  1.0
  O  O14  1  0.547  0.362  0.344  1.0
  O  O15  1  0.453  0.638  0.656  1.0
  O  O16  1  0.441  0.647  0.166  1.0
  O  O17  1  0.097  0.066  0.267  1.0
  O  O18  1  0.072  0.329  0.611  1.0
  O  O19  1  0.290  0.934  0.953  1.0
  O  O20  1  0.075  0.320  0.046  1.0
  O  O21  1  0.288  0.936  0.516  1.0
[/CIF]
.
The material structure described by Tb3SbO7 crystallizes in the triclinic P-1 space group. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to one O(3), one O(4), one O(7), two equivalent O(2), and two equivalent O(6) atoms to form distorted TbO7 hexagonal pyramids that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one Tb(3)O7 pentagonal bipyramid, edges with two equivalent Tb(1)O7 hexagonal pyramids,  an edgeedge with one Sb(1)O6 octahedra, and edges with two equivalent Tb(3)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-49°. In the second Tb site, Tb(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(5), one O(6), two equivalent O(4), and two equivalent O(7) atoms. In the third Tb site, Tb(3) is bonded to one O(5), one O(6), one O(7), two equivalent O(1), and two equivalent O(3) atoms to form distorted TbO7 pentagonal bipyramids that share  a cornercorner with one Tb(1)O7 hexagonal pyramid,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra, edges with two equivalent Tb(1)O7 hexagonal pyramids,  an edgeedge with one Sb(1)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, and edges with two equivalent Tb(3)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 44-45°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form SbO6 octahedra that share corners with two equivalent Tb(1)O7 hexagonal pyramids, corners with two equivalent Sb(2)O6 octahedra, corners with two equivalent Tb(3)O7 pentagonal bipyramids, edges with two equivalent Tb(1)O7 hexagonal pyramids, and edges with two equivalent Tb(3)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 40°. In the second Sb site, Sb(2) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form SbO6 octahedra that share corners with two equivalent Tb(1)O7 hexagonal pyramids, corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Tb(3)O7 pentagonal bipyramids, and edges with two equivalent Tb(3)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 40°. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Tb(2), two equivalent Tb(3), and one Sb(2) atom to form distorted OTb3Sb trigonal pyramids that share  a cornercorner with one O(6)Tb4 tetrahedra, corners with two equivalent O(4)Tb3Sb tetrahedra, corners with two equivalent O(7)Tb4 tetrahedra,  a cornercorner with one O(1)Tb3Sb trigonal pyramid, corners with four equivalent O(3)Tb3Sb trigonal pyramids,  an edgeedge with one O(4)Tb3Sb tetrahedra,  an edgeedge with one O(6)Tb4 tetrahedra,  an edgeedge with one O(7)Tb4 tetrahedra, and  an edgeedge with one O(1)Tb3Sb trigonal pyramid. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Tb(2), two equivalent Tb(1), and one Sb(1) atom. In the third O site, O(3) is bonded to one Tb(1), two equivalent Tb(3), and one Sb(1) atom to form distorted OTb3Sb trigonal pyramids that share  a cornercorner with one O(4)Tb3Sb tetrahedra,  a cornercorner with one O(7)Tb4 tetrahedra, corners with two equivalent O(6)Tb4 tetrahedra,  a cornercorner with one O(3)Tb3Sb trigonal pyramid, corners with four equivalent O(1)Tb3Sb trigonal pyramids,  an edgeedge with one O(6)Tb4 tetrahedra,  an edgeedge with one O(7)Tb4 tetrahedra, and  an edgeedge with one O(3)Tb3Sb trigonal pyramid. In the fourth O site, O(4) is bonded to one Tb(1), two equivalent Tb(2), and one Sb(2) atom to form distorted OTb3Sb tetrahedra that share  a cornercorner with one O(4)Tb3Sb tetrahedra, corners with three equivalent O(7)Tb4 tetrahedra, corners with four equivalent O(6)Tb4 tetrahedra,  a cornercorner with one O(3)Tb3Sb trigonal pyramid, corners with two equivalent O(1)Tb3Sb trigonal pyramids,  an edgeedge with one O(4)Tb3Sb tetrahedra,  an edgeedge with one O(7)Tb4 tetrahedra, and  an edgeedge with one O(1)Tb3Sb trigonal pyramid. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Tb(2), one Tb(3), one Sb(1), and one Sb(2) atom. In the sixth O site, O(6) is bonded to one Tb(2), one Tb(3), and two equivalent Tb(1) atoms to form OTb4 tetrahedra that share corners with three equivalent O(7)Tb4 tetrahedra, corners with four equivalent O(4)Tb3Sb tetrahedra,  a cornercorner with one O(1)Tb3Sb trigonal pyramid, corners with two equivalent O(3)Tb3Sb trigonal pyramids,  an edgeedge with one O(6)Tb4 tetrahedra,  an edgeedge with one O(7)Tb4 tetrahedra,  an edgeedge with one O(1)Tb3Sb trigonal pyramid, and  an edgeedge with one O(3)Tb3Sb trigonal pyramid. In the seventh O site, O(7) is bonded to one Tb(1), one Tb(3), and two equivalent Tb(2) atoms to form OTb4 tetrahedra that share corners with three equivalent O(4)Tb3Sb tetrahedra, corners with three equivalent O(6)Tb4 tetrahedra,  a cornercorner with one O(3)Tb3Sb trigonal pyramid, corners with two equivalent O(1)Tb3Sb trigonal pyramids,  an edgeedge with one O(4)Tb3Sb tetrahedra,  an edgeedge with one O(6)Tb4 tetrahedra,  an edgeedge with one O(7)Tb4 tetrahedra,  an edgeedge with one O(1)Tb3Sb trigonal pyramid, and  an edgeedge with one O(3)Tb3Sb trigonal pyramid. is represented by the CIF file [CIF]
data_Tb3SbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.395
_cell_length_b   6.448
_cell_length_c   7.530
_cell_angle_alpha   106.806
_cell_angle_beta   89.823
_cell_angle_gamma   98.016
_symmetry_Int_Tables_number   1
_cell_volume   294.142
_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
  Tb  Tb0  1  0.736  0.465  0.117  1.0
  Tb  Tb1  1  0.738  0.473  0.614  1.0
  Tb  Tb2  1  0.541  0.995  0.748  1.0
  Tb  Tb3  1  0.459  0.005  0.252  1.0
  Tb  Tb4  1  0.262  0.527  0.386  1.0
  Tb  Tb5  1  0.264  0.535  0.883  1.0
  Sb  Sb6  1  0.000  0.000  0.000  1.0
  Sb  Sb7  1  0.000  0.000  0.500  1.0
  O  O8  1  0.712  0.064  0.484  1.0
  O  O9  1  0.925  0.680  0.954  1.0
  O  O10  1  0.710  0.066  0.047  1.0
  O  O11  1  0.928  0.671  0.389  1.0
  O  O12  1  0.903  0.934  0.733  1.0
  O  O13  1  0.559  0.353  0.834  1.0
  O  O14  1  0.547  0.362  0.344  1.0
  O  O15  1  0.453  0.638  0.656  1.0
  O  O16  1  0.441  0.647  0.166  1.0
  O  O17  1  0.097  0.066  0.267  1.0
  O  O18  1  0.072  0.329  0.611  1.0
  O  O19  1  0.290  0.934  0.953  1.0
  O  O20  1  0.075  0.320  0.046  1.0
  O  O21  1  0.288  0.936  0.516  1.0
[/CIF]
.