The material described by Gd2FeSbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded to two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms to form distorted GdO8 hexagonal bipyramids that share edges with two equivalent Gd(1)O8 hexagonal bipyramids, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. In the second Gd site, Gd(2) is bonded in a distorted 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 Gd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 50-52°. 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 Gd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 48-50°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Gd(2) and two equivalent Fe(1) atoms to form distorted OGd2Fe2 tetrahedra that share corners with two equivalent O(4)Gd4 tetrahedra, corners with four equivalent O(1)Gd2Fe2 tetrahedra, corners with eight equivalent O(3)Gd2FeSb tetrahedra,  an edgeedge with one O(4)Gd4 tetrahedra, and edges with four equivalent O(3)Gd2FeSb tetrahedra. In the second O site, O(2) is bonded to two equivalent Gd(1) and two equivalent Sb(1) atoms to form distorted OGd2Sb2 tetrahedra that share corners with two equivalent O(4)Gd4 tetrahedra, corners with four equivalent O(2)Gd2Sb2 tetrahedra, corners with eight equivalent O(3)Gd2FeSb tetrahedra,  an edgeedge with one O(4)Gd4 tetrahedra, and edges with four equivalent O(3)Gd2FeSb tetrahedra. In the third O site, O(3) is bonded to one Gd(1), one Gd(2), one Fe(1), and one Sb(1) atom to form distorted OGd2FeSb tetrahedra that share corners with two equivalent O(1)Gd2Fe2 tetrahedra, corners with two equivalent O(2)Gd2Sb2 tetrahedra, corners with two equivalent O(4)Gd4 tetrahedra, corners with eight equivalent O(3)Gd2FeSb tetrahedra,  an edgeedge with one O(1)Gd2Fe2 tetrahedra,  an edgeedge with one O(2)Gd2Sb2 tetrahedra,  an edgeedge with one O(4)Gd4 tetrahedra, and edges with two equivalent O(3)Gd2FeSb tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Gd(1) and two equivalent Gd(2) atoms to form OGd4 tetrahedra that share corners with two equivalent O(1)Gd2Fe2 tetrahedra, corners with two equivalent O(2)Gd2Sb2 tetrahedra, corners with four equivalent O(4)Gd4 tetrahedra, corners with eight equivalent O(3)Gd2FeSb tetrahedra,  an edgeedge with one O(1)Gd2Fe2 tetrahedra,  an edgeedge with one O(2)Gd2Sb2 tetrahedra, and edges with four equivalent O(3)Gd2FeSb tetrahedra. is represented by the CIF file [CIF]
data_Gd2FeSbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.323
_cell_length_b   7.323
_cell_length_c   7.323
_cell_angle_alpha   120.328
_cell_angle_beta   119.606
_cell_angle_gamma   90.058
_symmetry_Int_Tables_number   1
_cell_volume   277.809
_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
  Gd  Gd0  1  0.000  0.000  0.500  1.0
  Gd  Gd1  1  0.000  0.500  0.000  1.0
  Gd  Gd2  1  0.000  0.000  0.000  1.0
  Gd  Gd3  1  0.500  0.000  0.500  1.0
  Fe  Fe4  1  0.500  0.500  0.500  1.0
  Fe  Fe5  1  0.500  0.000  0.000  1.0
  Sb  Sb6  1  0.500  0.500  0.000  1.0
  Sb  Sb7  1  0.000  0.500  0.500  1.0
  O  O8  1  0.414  0.164  0.250  1.0
  O  O9  1  0.829  0.579  0.250  1.0
  O  O10  1  0.414  0.578  0.242  1.0
  O  O11  1  0.836  0.172  0.258  1.0
  O  O12  1  0.414  0.172  0.836  1.0
  O  O13  1  0.836  0.578  0.664  1.0
  O  O14  1  0.586  0.836  0.750  1.0
  O  O15  1  0.171  0.421  0.750  1.0
  O  O16  1  0.586  0.422  0.758  1.0
  O  O17  1  0.164  0.828  0.742  1.0
  O  O18  1  0.586  0.828  0.164  1.0
  O  O19  1  0.164  0.422  0.336  1.0
  O  O20  1  0.123  0.873  0.250  1.0
  O  O21  1  0.877  0.127  0.750  1.0
[/CIF]
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The material described by Gd2FeSbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded to two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms to form distorted GdO8 hexagonal bipyramids that share edges with two equivalent Gd(1)O8 hexagonal bipyramids, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. In the second Gd site, Gd(2) is bonded in a distorted 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 Gd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 50-52°. 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 Gd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 48-50°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Gd(2) and two equivalent Fe(1) atoms to form distorted OGd2Fe2 tetrahedra that share corners with two equivalent O(4)Gd4 tetrahedra, corners with four equivalent O(1)Gd2Fe2 tetrahedra, corners with eight equivalent O(3)Gd2FeSb tetrahedra,  an edgeedge with one O(4)Gd4 tetrahedra, and edges with four equivalent O(3)Gd2FeSb tetrahedra. In the second O site, O(2) is bonded to two equivalent Gd(1) and two equivalent Sb(1) atoms to form distorted OGd2Sb2 tetrahedra that share corners with two equivalent O(4)Gd4 tetrahedra, corners with four equivalent O(2)Gd2Sb2 tetrahedra, corners with eight equivalent O(3)Gd2FeSb tetrahedra,  an edgeedge with one O(4)Gd4 tetrahedra, and edges with four equivalent O(3)Gd2FeSb tetrahedra. In the third O site, O(3) is bonded to one Gd(1), one Gd(2), one Fe(1), and one Sb(1) atom to form distorted OGd2FeSb tetrahedra that share corners with two equivalent O(1)Gd2Fe2 tetrahedra, corners with two equivalent O(2)Gd2Sb2 tetrahedra, corners with two equivalent O(4)Gd4 tetrahedra, corners with eight equivalent O(3)Gd2FeSb tetrahedra,  an edgeedge with one O(1)Gd2Fe2 tetrahedra,  an edgeedge with one O(2)Gd2Sb2 tetrahedra,  an edgeedge with one O(4)Gd4 tetrahedra, and edges with two equivalent O(3)Gd2FeSb tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Gd(1) and two equivalent Gd(2) atoms to form OGd4 tetrahedra that share corners with two equivalent O(1)Gd2Fe2 tetrahedra, corners with two equivalent O(2)Gd2Sb2 tetrahedra, corners with four equivalent O(4)Gd4 tetrahedra, corners with eight equivalent O(3)Gd2FeSb tetrahedra,  an edgeedge with one O(1)Gd2Fe2 tetrahedra,  an edgeedge with one O(2)Gd2Sb2 tetrahedra, and edges with four equivalent O(3)Gd2FeSb tetrahedra. is represented by the CIF file [CIF]
data_Gd2FeSbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.323
_cell_length_b   7.323
_cell_length_c   7.323
_cell_angle_alpha   120.328
_cell_angle_beta   119.606
_cell_angle_gamma   90.058
_symmetry_Int_Tables_number   1
_cell_volume   277.809
_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
  Gd  Gd0  1  0.000  0.000  0.500  1.0
  Gd  Gd1  1  0.000  0.500  0.000  1.0
  Gd  Gd2  1  0.000  0.000  0.000  1.0
  Gd  Gd3  1  0.500  0.000  0.500  1.0
  Fe  Fe4  1  0.500  0.500  0.500  1.0
  Fe  Fe5  1  0.500  0.000  0.000  1.0
  Sb  Sb6  1  0.500  0.500  0.000  1.0
  Sb  Sb7  1  0.000  0.500  0.500  1.0
  O  O8  1  0.414  0.164  0.250  1.0
  O  O9  1  0.829  0.579  0.250  1.0
  O  O10  1  0.414  0.578  0.242  1.0
  O  O11  1  0.836  0.172  0.258  1.0
  O  O12  1  0.414  0.172  0.836  1.0
  O  O13  1  0.836  0.578  0.664  1.0
  O  O14  1  0.586  0.836  0.750  1.0
  O  O15  1  0.171  0.421  0.750  1.0
  O  O16  1  0.586  0.422  0.758  1.0
  O  O17  1  0.164  0.828  0.742  1.0
  O  O18  1  0.586  0.828  0.164  1.0
  O  O19  1  0.164  0.422  0.336  1.0
  O  O20  1  0.123  0.873  0.250  1.0
  O  O21  1  0.877  0.127  0.750  1.0
[/CIF]
.