The material described by Eu2FeSbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent O(1), two equivalent O(3), and four equivalent O(4) atoms to form distorted EuO8 hexagonal bipyramids that share edges with two equivalent Eu(1)O8 hexagonal bipyramids, edges with four equivalent Eu(2)O8 hexagonal bipyramids, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. In the second Eu site, Eu(2) is bonded to two equivalent O(1), two equivalent O(2), and four equivalent O(4) atoms to form distorted EuO8 hexagonal bipyramids that share edges with two equivalent Eu(2)O8 hexagonal bipyramids, edges with four equivalent Eu(1)O8 hexagonal bipyramids, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. 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, corners with four equivalent Sb(1)O6 octahedra, edges with two equivalent Eu(1)O8 hexagonal bipyramids, and edges with four equivalent Eu(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 48-49°. 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, corners with four equivalent Fe(1)O6 octahedra, edges with two equivalent Eu(2)O8 hexagonal bipyramids, and edges with four equivalent Eu(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 47-48°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form OEu4 tetrahedra that share corners with two equivalent O(2)Eu2Fe2 tetrahedra, corners with two equivalent O(3)Eu2Sb2 tetrahedra, corners with four equivalent O(1)Eu4 tetrahedra, corners with eight equivalent O(4)Eu2FeSb tetrahedra,  an edgeedge with one O(2)Eu2Fe2 tetrahedra,  an edgeedge with one O(3)Eu2Sb2 tetrahedra, and edges with four equivalent O(4)Eu2FeSb tetrahedra. In the second O site, O(2) is bonded to two equivalent Eu(2) and two equivalent Fe(1) atoms to form distorted OEu2Fe2 tetrahedra that share corners with two equivalent O(1)Eu4 tetrahedra, corners with four equivalent O(2)Eu2Fe2 tetrahedra, corners with eight equivalent O(4)Eu2FeSb tetrahedra,  an edgeedge with one O(1)Eu4 tetrahedra, and edges with four equivalent O(4)Eu2FeSb tetrahedra. In the third O site, O(3) is bonded to two equivalent Eu(1) and two equivalent Sb(1) atoms to form distorted OEu2Sb2 tetrahedra that share corners with two equivalent O(1)Eu4 tetrahedra, corners with four equivalent O(3)Eu2Sb2 tetrahedra, corners with eight equivalent O(4)Eu2FeSb tetrahedra,  an edgeedge with one O(1)Eu4 tetrahedra, and edges with four equivalent O(4)Eu2FeSb tetrahedra. In the fourth O site, O(4) is bonded to one Eu(1), one Eu(2), one Fe(1), and one Sb(1) atom to form distorted OEu2FeSb tetrahedra that share corners with two equivalent O(2)Eu2Fe2 tetrahedra, corners with two equivalent O(3)Eu2Sb2 tetrahedra, corners with two equivalent O(1)Eu4 tetrahedra, corners with eight equivalent O(4)Eu2FeSb tetrahedra,  an edgeedge with one O(2)Eu2Fe2 tetrahedra,  an edgeedge with one O(3)Eu2Sb2 tetrahedra,  an edgeedge with one O(1)Eu4 tetrahedra, and edges with two equivalent O(4)Eu2FeSb tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu2FeSbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.401
_cell_length_b   7.401
_cell_length_c   7.401
_cell_angle_alpha   120.547
_cell_angle_beta   119.488
_cell_angle_gamma   89.973
_symmetry_Int_Tables_number   1
_cell_volume   286.563
_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
  Eu  Eu0  1  0.000  0.000  0.500  1.0
  Eu  Eu1  1  0.000  0.500  0.000  1.0
  Eu  Eu2  1  0.000  0.000  0.000  1.0
  Eu  Eu3  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  0.125  0.875  0.250  1.0
  O  O9  1  0.875  0.125  0.750  1.0
  O  O10  1  0.421  0.171  0.250  1.0
  O  O11  1  0.828  0.578  0.250  1.0
  O  O12  1  0.420  0.577  0.246  1.0
  O  O13  1  0.831  0.174  0.254  1.0
  O  O14  1  0.420  0.174  0.843  1.0
  O  O15  1  0.831  0.577  0.657  1.0
  O  O16  1  0.579  0.829  0.750  1.0
  O  O17  1  0.172  0.422  0.750  1.0
  O  O18  1  0.580  0.423  0.754  1.0
  O  O19  1  0.169  0.826  0.746  1.0
  O  O20  1  0.580  0.826  0.157  1.0
  O  O21  1  0.169  0.423  0.343  1.0
[/CIF]
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The material described by Eu2FeSbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent O(1), two equivalent O(3), and four equivalent O(4) atoms to form distorted EuO8 hexagonal bipyramids that share edges with two equivalent Eu(1)O8 hexagonal bipyramids, edges with four equivalent Eu(2)O8 hexagonal bipyramids, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. In the second Eu site, Eu(2) is bonded to two equivalent O(1), two equivalent O(2), and four equivalent O(4) atoms to form distorted EuO8 hexagonal bipyramids that share edges with two equivalent Eu(2)O8 hexagonal bipyramids, edges with four equivalent Eu(1)O8 hexagonal bipyramids, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. 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, corners with four equivalent Sb(1)O6 octahedra, edges with two equivalent Eu(1)O8 hexagonal bipyramids, and edges with four equivalent Eu(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 48-49°. 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, corners with four equivalent Fe(1)O6 octahedra, edges with two equivalent Eu(2)O8 hexagonal bipyramids, and edges with four equivalent Eu(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 47-48°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form OEu4 tetrahedra that share corners with two equivalent O(2)Eu2Fe2 tetrahedra, corners with two equivalent O(3)Eu2Sb2 tetrahedra, corners with four equivalent O(1)Eu4 tetrahedra, corners with eight equivalent O(4)Eu2FeSb tetrahedra,  an edgeedge with one O(2)Eu2Fe2 tetrahedra,  an edgeedge with one O(3)Eu2Sb2 tetrahedra, and edges with four equivalent O(4)Eu2FeSb tetrahedra. In the second O site, O(2) is bonded to two equivalent Eu(2) and two equivalent Fe(1) atoms to form distorted OEu2Fe2 tetrahedra that share corners with two equivalent O(1)Eu4 tetrahedra, corners with four equivalent O(2)Eu2Fe2 tetrahedra, corners with eight equivalent O(4)Eu2FeSb tetrahedra,  an edgeedge with one O(1)Eu4 tetrahedra, and edges with four equivalent O(4)Eu2FeSb tetrahedra. In the third O site, O(3) is bonded to two equivalent Eu(1) and two equivalent Sb(1) atoms to form distorted OEu2Sb2 tetrahedra that share corners with two equivalent O(1)Eu4 tetrahedra, corners with four equivalent O(3)Eu2Sb2 tetrahedra, corners with eight equivalent O(4)Eu2FeSb tetrahedra,  an edgeedge with one O(1)Eu4 tetrahedra, and edges with four equivalent O(4)Eu2FeSb tetrahedra. In the fourth O site, O(4) is bonded to one Eu(1), one Eu(2), one Fe(1), and one Sb(1) atom to form distorted OEu2FeSb tetrahedra that share corners with two equivalent O(2)Eu2Fe2 tetrahedra, corners with two equivalent O(3)Eu2Sb2 tetrahedra, corners with two equivalent O(1)Eu4 tetrahedra, corners with eight equivalent O(4)Eu2FeSb tetrahedra,  an edgeedge with one O(2)Eu2Fe2 tetrahedra,  an edgeedge with one O(3)Eu2Sb2 tetrahedra,  an edgeedge with one O(1)Eu4 tetrahedra, and edges with two equivalent O(4)Eu2FeSb tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu2FeSbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.401
_cell_length_b   7.401
_cell_length_c   7.401
_cell_angle_alpha   120.547
_cell_angle_beta   119.488
_cell_angle_gamma   89.973
_symmetry_Int_Tables_number   1
_cell_volume   286.563
_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
  Eu  Eu0  1  0.000  0.000  0.500  1.0
  Eu  Eu1  1  0.000  0.500  0.000  1.0
  Eu  Eu2  1  0.000  0.000  0.000  1.0
  Eu  Eu3  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  0.125  0.875  0.250  1.0
  O  O9  1  0.875  0.125  0.750  1.0
  O  O10  1  0.421  0.171  0.250  1.0
  O  O11  1  0.828  0.578  0.250  1.0
  O  O12  1  0.420  0.577  0.246  1.0
  O  O13  1  0.831  0.174  0.254  1.0
  O  O14  1  0.420  0.174  0.843  1.0
  O  O15  1  0.831  0.577  0.657  1.0
  O  O16  1  0.579  0.829  0.750  1.0
  O  O17  1  0.172  0.422  0.750  1.0
  O  O18  1  0.580  0.423  0.754  1.0
  O  O19  1  0.169  0.826  0.746  1.0
  O  O20  1  0.580  0.826  0.157  1.0
  O  O21  1  0.169  0.423  0.343  1.0
[/CIF]
.