The crystal structure described by Pr2(FeSb)O7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms to form distorted PrO8 hexagonal bipyramids that share edges with two equivalent Pr(1)O8 hexagonal bipyramids, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. In the second Pr site, Pr(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 Pr(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 48-50°. 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 Pr(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-48°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Pr(2) and two equivalent Fe(1) atoms to form distorted OPr2Fe2 tetrahedra that share corners with two equivalent O(4)Pr4 tetrahedra, corners with four equivalent O(1)Pr2Fe2 tetrahedra, corners with eight equivalent O(3)Pr2FeSb tetrahedra,  an edgeedge with one O(4)Pr4 tetrahedra, and edges with four equivalent O(3)Pr2FeSb tetrahedra. In the second O site, O(2) is bonded to two equivalent Pr(1) and two equivalent Sb(1) atoms to form distorted OPr2Sb2 tetrahedra that share corners with two equivalent O(4)Pr4 tetrahedra, corners with four equivalent O(2)Pr2Sb2 tetrahedra, corners with eight equivalent O(3)Pr2FeSb tetrahedra,  an edgeedge with one O(4)Pr4 tetrahedra, and edges with four equivalent O(3)Pr2FeSb tetrahedra. In the third O site, O(3) is bonded to one Pr(1), one Pr(2), one Fe(1), and one Sb(1) atom to form distorted OPr2FeSb tetrahedra that share corners with two equivalent O(1)Pr2Fe2 tetrahedra, corners with two equivalent O(2)Pr2Sb2 tetrahedra, corners with two equivalent O(4)Pr4 tetrahedra, corners with eight equivalent O(3)Pr2FeSb tetrahedra,  an edgeedge with one O(1)Pr2Fe2 tetrahedra,  an edgeedge with one O(2)Pr2Sb2 tetrahedra,  an edgeedge with one O(4)Pr4 tetrahedra, and edges with two equivalent O(3)Pr2FeSb tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Pr(1) and two equivalent Pr(2) atoms to form OPr4 tetrahedra that share corners with two equivalent O(1)Pr2Fe2 tetrahedra, corners with two equivalent O(2)Pr2Sb2 tetrahedra, corners with four equivalent O(4)Pr4 tetrahedra, corners with eight equivalent O(3)Pr2FeSb tetrahedra,  an edgeedge with one O(1)Pr2Fe2 tetrahedra,  an edgeedge with one O(2)Pr2Sb2 tetrahedra, and edges with four equivalent O(3)Pr2FeSb tetrahedra. is represented by the CIF card [CIF]
data_Pr2FeSbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.491
_cell_length_b   7.491
_cell_length_c   7.491
_cell_angle_alpha   120.272
_cell_angle_beta   119.509
_cell_angle_gamma   90.191
_symmetry_Int_Tables_number   1
_cell_volume   297.652
_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
  Pr  Pr0  1  0.500  0.000  0.000  1.0
  Pr  Pr1  1  0.500  0.500  0.500  1.0
  Pr  Pr2  1  0.500  0.000  0.500  1.0
  Pr  Pr3  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  0.917  0.167  0.750  1.0
  O  O9  1  0.326  0.576  0.750  1.0
  O  O10  1  0.916  0.574  0.739  1.0
  O  O11  1  0.335  0.177  0.761  1.0
  O  O12  1  0.916  0.177  0.342  1.0
  O  O13  1  0.335  0.574  0.158  1.0
  O  O14  1  0.083  0.833  0.250  1.0
  O  O15  1  0.674  0.424  0.250  1.0
  O  O16  1  0.084  0.426  0.261  1.0
  O  O17  1  0.665  0.823  0.239  1.0
  O  O18  1  0.084  0.823  0.658  1.0
  O  O19  1  0.665  0.426  0.842  1.0
  O  O20  1  0.624  0.874  0.750  1.0
  O  O21  1  0.376  0.126  0.250  1.0
[/CIF]
.
The crystal structure described by Pr2(FeSb)O7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms to form distorted PrO8 hexagonal bipyramids that share edges with two equivalent Pr(1)O8 hexagonal bipyramids, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. In the second Pr site, Pr(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 Pr(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 48-50°. 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 Pr(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-48°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Pr(2) and two equivalent Fe(1) atoms to form distorted OPr2Fe2 tetrahedra that share corners with two equivalent O(4)Pr4 tetrahedra, corners with four equivalent O(1)Pr2Fe2 tetrahedra, corners with eight equivalent O(3)Pr2FeSb tetrahedra,  an edgeedge with one O(4)Pr4 tetrahedra, and edges with four equivalent O(3)Pr2FeSb tetrahedra. In the second O site, O(2) is bonded to two equivalent Pr(1) and two equivalent Sb(1) atoms to form distorted OPr2Sb2 tetrahedra that share corners with two equivalent O(4)Pr4 tetrahedra, corners with four equivalent O(2)Pr2Sb2 tetrahedra, corners with eight equivalent O(3)Pr2FeSb tetrahedra,  an edgeedge with one O(4)Pr4 tetrahedra, and edges with four equivalent O(3)Pr2FeSb tetrahedra. In the third O site, O(3) is bonded to one Pr(1), one Pr(2), one Fe(1), and one Sb(1) atom to form distorted OPr2FeSb tetrahedra that share corners with two equivalent O(1)Pr2Fe2 tetrahedra, corners with two equivalent O(2)Pr2Sb2 tetrahedra, corners with two equivalent O(4)Pr4 tetrahedra, corners with eight equivalent O(3)Pr2FeSb tetrahedra,  an edgeedge with one O(1)Pr2Fe2 tetrahedra,  an edgeedge with one O(2)Pr2Sb2 tetrahedra,  an edgeedge with one O(4)Pr4 tetrahedra, and edges with two equivalent O(3)Pr2FeSb tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Pr(1) and two equivalent Pr(2) atoms to form OPr4 tetrahedra that share corners with two equivalent O(1)Pr2Fe2 tetrahedra, corners with two equivalent O(2)Pr2Sb2 tetrahedra, corners with four equivalent O(4)Pr4 tetrahedra, corners with eight equivalent O(3)Pr2FeSb tetrahedra,  an edgeedge with one O(1)Pr2Fe2 tetrahedra,  an edgeedge with one O(2)Pr2Sb2 tetrahedra, and edges with four equivalent O(3)Pr2FeSb tetrahedra. is represented by the CIF card [CIF]
data_Pr2FeSbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.491
_cell_length_b   7.491
_cell_length_c   7.491
_cell_angle_alpha   120.272
_cell_angle_beta   119.509
_cell_angle_gamma   90.191
_symmetry_Int_Tables_number   1
_cell_volume   297.652
_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
  Pr  Pr0  1  0.500  0.000  0.000  1.0
  Pr  Pr1  1  0.500  0.500  0.500  1.0
  Pr  Pr2  1  0.500  0.000  0.500  1.0
  Pr  Pr3  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  0.917  0.167  0.750  1.0
  O  O9  1  0.326  0.576  0.750  1.0
  O  O10  1  0.916  0.574  0.739  1.0
  O  O11  1  0.335  0.177  0.761  1.0
  O  O12  1  0.916  0.177  0.342  1.0
  O  O13  1  0.335  0.574  0.158  1.0
  O  O14  1  0.083  0.833  0.250  1.0
  O  O15  1  0.674  0.424  0.250  1.0
  O  O16  1  0.084  0.426  0.261  1.0
  O  O17  1  0.665  0.823  0.239  1.0
  O  O18  1  0.084  0.823  0.658  1.0
  O  O19  1  0.665  0.426  0.842  1.0
  O  O20  1  0.624  0.874  0.750  1.0
  O  O21  1  0.376  0.126  0.250  1.0
[/CIF]
.