The material described by Tb2FeSbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms to form distorted TbO8 hexagonal bipyramids that share edges with two equivalent Tb(1)O8 hexagonal bipyramids, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. In the second Tb site, Tb(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(4), and four equivalent O(3) atoms. Fe(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra, and edges with two equivalent Tb(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 51-54°. Sb(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, and edges with four equivalent Tb(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 48-51°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Tb(2) and two equivalent Fe(1) atoms to form distorted OTb2Fe2 tetrahedra that share corners with two equivalent O(4)Tb4 tetrahedra, corners with four equivalent O(1)Tb2Fe2 tetrahedra, corners with eight equivalent O(3)Tb2FeSb tetrahedra,  an edgeedge with one O(4)Tb4 tetrahedra, and edges with four equivalent O(3)Tb2FeSb tetrahedra. In the second O site, O(2) is bonded to two equivalent Tb(1) and two equivalent Sb(1) atoms to form distorted OTb2Sb2 tetrahedra that share corners with two equivalent O(4)Tb4 tetrahedra, corners with four equivalent O(2)Tb2Sb2 tetrahedra, corners with eight equivalent O(3)Tb2FeSb tetrahedra,  an edgeedge with one O(4)Tb4 tetrahedra, and edges with four equivalent O(3)Tb2FeSb tetrahedra. In the third O site, O(3) is bonded to one Tb(1), one Tb(2), one Fe(1), and one Sb(1) atom to form distorted OTb2FeSb tetrahedra that share corners with two equivalent O(1)Tb2Fe2 tetrahedra, corners with two equivalent O(2)Tb2Sb2 tetrahedra, corners with two equivalent O(4)Tb4 tetrahedra, corners with eight equivalent O(3)Tb2FeSb tetrahedra,  an edgeedge with one O(1)Tb2Fe2 tetrahedra,  an edgeedge with one O(2)Tb2Sb2 tetrahedra,  an edgeedge with one O(4)Tb4 tetrahedra, and edges with two equivalent O(3)Tb2FeSb tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Tb(1) and two equivalent Tb(2) atoms to form OTb4 tetrahedra that share corners with two equivalent O(1)Tb2Fe2 tetrahedra, corners with two equivalent O(2)Tb2Sb2 tetrahedra, corners with four equivalent O(4)Tb4 tetrahedra, corners with eight equivalent O(3)Tb2FeSb tetrahedra,  an edgeedge with one O(1)Tb2Fe2 tetrahedra,  an edgeedge with one O(2)Tb2Sb2 tetrahedra, and edges with four equivalent O(3)Tb2FeSb tetrahedra. is represented by the CIF file [CIF]
data_Tb2FeSbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.324
_cell_length_b   7.324
_cell_length_c   7.324
_cell_angle_alpha   120.348
_cell_angle_beta   119.429
_cell_angle_gamma   90.195
_symmetry_Int_Tables_number   1
_cell_volume   278.281
_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  0.500  0.000  0.000  1.0
  Tb  Tb1  1  0.500  0.500  0.500  1.0
  Tb  Tb2  1  0.500  0.000  0.500  1.0
  Tb  Tb3  1  0.000  0.000  0.000  1.0
  Fe  Fe4  1  0.000  0.500  0.000  1.0
  Fe  Fe5  1  0.000  0.000  0.500  1.0
  Sb  Sb6  1  0.000  0.500  0.500  1.0
  Sb  Sb7  1  0.500  0.500  0.000  1.0
  O  O8  1  0.911  0.161  0.750  1.0
  O  O9  1  0.330  0.580  0.750  1.0
  O  O10  1  0.910  0.579  0.740  1.0
  O  O11  1  0.338  0.170  0.760  1.0
  O  O12  1  0.910  0.170  0.332  1.0
  O  O13  1  0.338  0.579  0.168  1.0
  O  O14  1  0.089  0.839  0.250  1.0
  O  O15  1  0.670  0.420  0.250  1.0
  O  O16  1  0.090  0.421  0.260  1.0
  O  O17  1  0.662  0.830  0.240  1.0
  O  O18  1  0.090  0.830  0.668  1.0
  O  O19  1  0.662  0.421  0.832  1.0
  O  O20  1  0.623  0.873  0.750  1.0
  O  O21  1  0.377  0.127  0.250  1.0
[/CIF]
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The material described by Tb2FeSbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms to form distorted TbO8 hexagonal bipyramids that share edges with two equivalent Tb(1)O8 hexagonal bipyramids, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. In the second Tb site, Tb(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(4), and four equivalent O(3) atoms. Fe(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra, and edges with two equivalent Tb(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 51-54°. Sb(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with four equivalent Fe(1)O6 octahedra, and edges with four equivalent Tb(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 48-51°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Tb(2) and two equivalent Fe(1) atoms to form distorted OTb2Fe2 tetrahedra that share corners with two equivalent O(4)Tb4 tetrahedra, corners with four equivalent O(1)Tb2Fe2 tetrahedra, corners with eight equivalent O(3)Tb2FeSb tetrahedra,  an edgeedge with one O(4)Tb4 tetrahedra, and edges with four equivalent O(3)Tb2FeSb tetrahedra. In the second O site, O(2) is bonded to two equivalent Tb(1) and two equivalent Sb(1) atoms to form distorted OTb2Sb2 tetrahedra that share corners with two equivalent O(4)Tb4 tetrahedra, corners with four equivalent O(2)Tb2Sb2 tetrahedra, corners with eight equivalent O(3)Tb2FeSb tetrahedra,  an edgeedge with one O(4)Tb4 tetrahedra, and edges with four equivalent O(3)Tb2FeSb tetrahedra. In the third O site, O(3) is bonded to one Tb(1), one Tb(2), one Fe(1), and one Sb(1) atom to form distorted OTb2FeSb tetrahedra that share corners with two equivalent O(1)Tb2Fe2 tetrahedra, corners with two equivalent O(2)Tb2Sb2 tetrahedra, corners with two equivalent O(4)Tb4 tetrahedra, corners with eight equivalent O(3)Tb2FeSb tetrahedra,  an edgeedge with one O(1)Tb2Fe2 tetrahedra,  an edgeedge with one O(2)Tb2Sb2 tetrahedra,  an edgeedge with one O(4)Tb4 tetrahedra, and edges with two equivalent O(3)Tb2FeSb tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Tb(1) and two equivalent Tb(2) atoms to form OTb4 tetrahedra that share corners with two equivalent O(1)Tb2Fe2 tetrahedra, corners with two equivalent O(2)Tb2Sb2 tetrahedra, corners with four equivalent O(4)Tb4 tetrahedra, corners with eight equivalent O(3)Tb2FeSb tetrahedra,  an edgeedge with one O(1)Tb2Fe2 tetrahedra,  an edgeedge with one O(2)Tb2Sb2 tetrahedra, and edges with four equivalent O(3)Tb2FeSb tetrahedra. is represented by the CIF file [CIF]
data_Tb2FeSbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.324
_cell_length_b   7.324
_cell_length_c   7.324
_cell_angle_alpha   120.348
_cell_angle_beta   119.429
_cell_angle_gamma   90.195
_symmetry_Int_Tables_number   1
_cell_volume   278.281
_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  0.500  0.000  0.000  1.0
  Tb  Tb1  1  0.500  0.500  0.500  1.0
  Tb  Tb2  1  0.500  0.000  0.500  1.0
  Tb  Tb3  1  0.000  0.000  0.000  1.0
  Fe  Fe4  1  0.000  0.500  0.000  1.0
  Fe  Fe5  1  0.000  0.000  0.500  1.0
  Sb  Sb6  1  0.000  0.500  0.500  1.0
  Sb  Sb7  1  0.500  0.500  0.000  1.0
  O  O8  1  0.911  0.161  0.750  1.0
  O  O9  1  0.330  0.580  0.750  1.0
  O  O10  1  0.910  0.579  0.740  1.0
  O  O11  1  0.338  0.170  0.760  1.0
  O  O12  1  0.910  0.170  0.332  1.0
  O  O13  1  0.338  0.579  0.168  1.0
  O  O14  1  0.089  0.839  0.250  1.0
  O  O15  1  0.670  0.420  0.250  1.0
  O  O16  1  0.090  0.421  0.260  1.0
  O  O17  1  0.662  0.830  0.240  1.0
  O  O18  1  0.090  0.830  0.668  1.0
  O  O19  1  0.662  0.421  0.832  1.0
  O  O20  1  0.623  0.873  0.750  1.0
  O  O21  1  0.377  0.127  0.250  1.0
[/CIF]
.