The material structure described by Er2FeSbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(4) atoms. In the second Er site, Er(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(4) atoms. Fe(1) is bonded to two equivalent O(2) and four equivalent O(4) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with four equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 51°. Sb(1) is bonded to two equivalent O(3) and four equivalent O(4) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra and corners with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Er(1) and two equivalent Er(2) atoms to form OEr4 tetrahedra that share corners with two equivalent O(2)Er2Fe2 tetrahedra, corners with two equivalent O(3)Er2Sb2 tetrahedra, corners with four equivalent O(1)Er4 tetrahedra, corners with eight equivalent O(4)Er2FeSb tetrahedra,  an edgeedge with one O(2)Er2Fe2 tetrahedra,  an edgeedge with one O(3)Er2Sb2 tetrahedra, and edges with four equivalent O(4)Er2FeSb tetrahedra. In the second O site, O(2) is bonded to two equivalent Er(2) and two equivalent Fe(1) atoms to form distorted OEr2Fe2 tetrahedra that share corners with two equivalent O(1)Er4 tetrahedra, corners with four equivalent O(2)Er2Fe2 tetrahedra, corners with eight equivalent O(4)Er2FeSb tetrahedra,  an edgeedge with one O(1)Er4 tetrahedra, and edges with four equivalent O(4)Er2FeSb tetrahedra. In the third O site, O(3) is bonded to two equivalent Er(1) and two equivalent Sb(1) atoms to form distorted OEr2Sb2 tetrahedra that share corners with two equivalent O(1)Er4 tetrahedra, corners with four equivalent O(3)Er2Sb2 tetrahedra, corners with eight equivalent O(4)Er2FeSb tetrahedra,  an edgeedge with one O(1)Er4 tetrahedra, and edges with four equivalent O(4)Er2FeSb tetrahedra. In the fourth O site, O(4) is bonded to one Er(1), one Er(2), one Fe(1), and one Sb(1) atom to form distorted OEr2FeSb tetrahedra that share corners with two equivalent O(2)Er2Fe2 tetrahedra, corners with two equivalent O(3)Er2Sb2 tetrahedra, corners with two equivalent O(1)Er4 tetrahedra, corners with eight equivalent O(4)Er2FeSb tetrahedra,  an edgeedge with one O(2)Er2Fe2 tetrahedra,  an edgeedge with one O(3)Er2Sb2 tetrahedra,  an edgeedge with one O(1)Er4 tetrahedra, and edges with two equivalent O(4)Er2FeSb tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er2FeSbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.197
_cell_length_b   7.197
_cell_length_c   7.197
_cell_angle_alpha   120.390
_cell_angle_beta   119.211
_cell_angle_gamma   90.349
_symmetry_Int_Tables_number   1
_cell_volume   264.382
_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
  Er  Er0  1  0.000  0.000  0.500  1.0
  Er  Er1  1  0.000  0.500  0.000  1.0
  Er  Er2  1  0.000  0.000  0.000  1.0
  Er  Er3  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  0.124  0.874  0.250  1.0
  O  O9  1  0.876  0.126  0.750  1.0
  O  O10  1  0.416  0.166  0.250  1.0
  O  O11  1  0.836  0.586  0.250  1.0
  O  O12  1  0.413  0.583  0.248  1.0
  O  O13  1  0.834  0.165  0.252  1.0
  O  O14  1  0.413  0.165  0.830  1.0
  O  O15  1  0.834  0.583  0.670  1.0
  O  O16  1  0.584  0.834  0.750  1.0
  O  O17  1  0.164  0.414  0.750  1.0
  O  O18  1  0.587  0.417  0.752  1.0
  O  O19  1  0.166  0.835  0.748  1.0
  O  O20  1  0.587  0.835  0.170  1.0
  O  O21  1  0.166  0.417  0.330  1.0
[/CIF]
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The material structure described by Er2FeSbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(4) atoms. In the second Er site, Er(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(4) atoms. Fe(1) is bonded to two equivalent O(2) and four equivalent O(4) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with four equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 51°. Sb(1) is bonded to two equivalent O(3) and four equivalent O(4) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra and corners with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Er(1) and two equivalent Er(2) atoms to form OEr4 tetrahedra that share corners with two equivalent O(2)Er2Fe2 tetrahedra, corners with two equivalent O(3)Er2Sb2 tetrahedra, corners with four equivalent O(1)Er4 tetrahedra, corners with eight equivalent O(4)Er2FeSb tetrahedra,  an edgeedge with one O(2)Er2Fe2 tetrahedra,  an edgeedge with one O(3)Er2Sb2 tetrahedra, and edges with four equivalent O(4)Er2FeSb tetrahedra. In the second O site, O(2) is bonded to two equivalent Er(2) and two equivalent Fe(1) atoms to form distorted OEr2Fe2 tetrahedra that share corners with two equivalent O(1)Er4 tetrahedra, corners with four equivalent O(2)Er2Fe2 tetrahedra, corners with eight equivalent O(4)Er2FeSb tetrahedra,  an edgeedge with one O(1)Er4 tetrahedra, and edges with four equivalent O(4)Er2FeSb tetrahedra. In the third O site, O(3) is bonded to two equivalent Er(1) and two equivalent Sb(1) atoms to form distorted OEr2Sb2 tetrahedra that share corners with two equivalent O(1)Er4 tetrahedra, corners with four equivalent O(3)Er2Sb2 tetrahedra, corners with eight equivalent O(4)Er2FeSb tetrahedra,  an edgeedge with one O(1)Er4 tetrahedra, and edges with four equivalent O(4)Er2FeSb tetrahedra. In the fourth O site, O(4) is bonded to one Er(1), one Er(2), one Fe(1), and one Sb(1) atom to form distorted OEr2FeSb tetrahedra that share corners with two equivalent O(2)Er2Fe2 tetrahedra, corners with two equivalent O(3)Er2Sb2 tetrahedra, corners with two equivalent O(1)Er4 tetrahedra, corners with eight equivalent O(4)Er2FeSb tetrahedra,  an edgeedge with one O(2)Er2Fe2 tetrahedra,  an edgeedge with one O(3)Er2Sb2 tetrahedra,  an edgeedge with one O(1)Er4 tetrahedra, and edges with two equivalent O(4)Er2FeSb tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er2FeSbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.197
_cell_length_b   7.197
_cell_length_c   7.197
_cell_angle_alpha   120.390
_cell_angle_beta   119.211
_cell_angle_gamma   90.349
_symmetry_Int_Tables_number   1
_cell_volume   264.382
_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
  Er  Er0  1  0.000  0.000  0.500  1.0
  Er  Er1  1  0.000  0.500  0.000  1.0
  Er  Er2  1  0.000  0.000  0.000  1.0
  Er  Er3  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  0.124  0.874  0.250  1.0
  O  O9  1  0.876  0.126  0.750  1.0
  O  O10  1  0.416  0.166  0.250  1.0
  O  O11  1  0.836  0.586  0.250  1.0
  O  O12  1  0.413  0.583  0.248  1.0
  O  O13  1  0.834  0.165  0.252  1.0
  O  O14  1  0.413  0.165  0.830  1.0
  O  O15  1  0.834  0.583  0.670  1.0
  O  O16  1  0.584  0.834  0.750  1.0
  O  O17  1  0.164  0.414  0.750  1.0
  O  O18  1  0.587  0.417  0.752  1.0
  O  O19  1  0.166  0.835  0.748  1.0
  O  O20  1  0.587  0.835  0.170  1.0
  O  O21  1  0.166  0.417  0.330  1.0
[/CIF]
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