The crystal structure described by BaGdFeCuO5 crystallizes in the tetragonal P4mm space group. Ba(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(3) atoms. Gd(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Fe(1) is bonded to one O(3) and four equivalent O(2) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Cu(1)O5 square pyramid and corners with four equivalent Fe(1)O5 trigonal bipyramids. Cu(1) is bonded to one O(3) and four equivalent O(1) atoms to form CuO5 square pyramids that share corners with four equivalent Cu(1)O5 square pyramids and  a cornercorner with one Fe(1)O5 trigonal bipyramid. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), two equivalent Gd(1), and two equivalent Cu(1) atoms to form distorted OBa2Gd2Cu2 octahedra that share corners with two equivalent O(1)Ba2Gd2Cu2 octahedra, corners with four equivalent O(3)Ba4FeCu octahedra, corners with six equivalent O(2)Gd2Fe2 tetrahedra, edges with two equivalent O(1)Ba2Gd2Cu2 octahedra,  an edgeedge with one O(2)Gd2Fe2 tetrahedra, faces with two equivalent O(3)Ba4FeCu octahedra, and faces with four equivalent O(1)Ba2Gd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 10-54°. In the second O site, O(2) is bonded to two equivalent Gd(1) and two equivalent Fe(1) atoms to form distorted OGd2Fe2 tetrahedra that share corners with two equivalent O(3)Ba4FeCu octahedra, corners with six equivalent O(1)Ba2Gd2Cu2 octahedra, corners with four equivalent O(2)Gd2Fe2 tetrahedra,  an edgeedge with one O(1)Ba2Gd2Cu2 octahedra, and edges with four equivalent O(2)Gd2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 3-74°. In the third O site, O(3) is bonded to four equivalent Ba(1), one Fe(1), and one Cu(1) atom to form distorted OBa4FeCu octahedra that share corners with four equivalent O(3)Ba4FeCu octahedra, corners with eight equivalent O(1)Ba2Gd2Cu2 octahedra, corners with four equivalent O(2)Gd2Fe2 tetrahedra, edges with four equivalent O(3)Ba4FeCu octahedra, and faces with four equivalent O(1)Ba2Gd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 20-54°. is represented by the Crystallographic Information File (CIF) [CIF]
data_BaGdFeCuO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.906
_cell_length_b   3.906
_cell_length_c   7.990
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   121.925
_cell_formula_units_Z   1
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
  Ba  Ba0  1  0.500  0.500  0.744  1.0
  Gd  Gd1  1  0.500  0.500  0.209  1.0
  Fe  Fe2  1  0.000  0.000  0.451  1.0
  Cu  Cu3  1  0.000  0.000  0.998  1.0
  O  O4  1  0.500  0.000  0.018  1.0
  O  O5  1  0.000  0.500  0.018  1.0
  O  O6  1  0.500  0.000  0.382  1.0
  O  O7  1  0.000  0.500  0.382  1.0
  O  O8  1  0.000  0.000  0.685  1.0
[/CIF]
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The crystal structure described by BaGdFeCuO5 crystallizes in the tetragonal P4mm space group. Ba(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(3) atoms. Gd(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Fe(1) is bonded to one O(3) and four equivalent O(2) atoms to form distorted FeO5 trigonal bipyramids that share  a cornercorner with one Cu(1)O5 square pyramid and corners with four equivalent Fe(1)O5 trigonal bipyramids. Cu(1) is bonded to one O(3) and four equivalent O(1) atoms to form CuO5 square pyramids that share corners with four equivalent Cu(1)O5 square pyramids and  a cornercorner with one Fe(1)O5 trigonal bipyramid. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), two equivalent Gd(1), and two equivalent Cu(1) atoms to form distorted OBa2Gd2Cu2 octahedra that share corners with two equivalent O(1)Ba2Gd2Cu2 octahedra, corners with four equivalent O(3)Ba4FeCu octahedra, corners with six equivalent O(2)Gd2Fe2 tetrahedra, edges with two equivalent O(1)Ba2Gd2Cu2 octahedra,  an edgeedge with one O(2)Gd2Fe2 tetrahedra, faces with two equivalent O(3)Ba4FeCu octahedra, and faces with four equivalent O(1)Ba2Gd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 10-54°. In the second O site, O(2) is bonded to two equivalent Gd(1) and two equivalent Fe(1) atoms to form distorted OGd2Fe2 tetrahedra that share corners with two equivalent O(3)Ba4FeCu octahedra, corners with six equivalent O(1)Ba2Gd2Cu2 octahedra, corners with four equivalent O(2)Gd2Fe2 tetrahedra,  an edgeedge with one O(1)Ba2Gd2Cu2 octahedra, and edges with four equivalent O(2)Gd2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 3-74°. In the third O site, O(3) is bonded to four equivalent Ba(1), one Fe(1), and one Cu(1) atom to form distorted OBa4FeCu octahedra that share corners with four equivalent O(3)Ba4FeCu octahedra, corners with eight equivalent O(1)Ba2Gd2Cu2 octahedra, corners with four equivalent O(2)Gd2Fe2 tetrahedra, edges with four equivalent O(3)Ba4FeCu octahedra, and faces with four equivalent O(1)Ba2Gd2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 20-54°. is represented by the Crystallographic Information File (CIF) [CIF]
data_BaGdFeCuO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.906
_cell_length_b   3.906
_cell_length_c   7.990
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   121.925
_cell_formula_units_Z   1
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
  Ba  Ba0  1  0.500  0.500  0.744  1.0
  Gd  Gd1  1  0.500  0.500  0.209  1.0
  Fe  Fe2  1  0.000  0.000  0.451  1.0
  Cu  Cu3  1  0.000  0.000  0.998  1.0
  O  O4  1  0.500  0.000  0.018  1.0
  O  O5  1  0.000  0.500  0.018  1.0
  O  O6  1  0.500  0.000  0.382  1.0
  O  O7  1  0.000  0.500  0.382  1.0
  O  O8  1  0.000  0.000  0.685  1.0
[/CIF]
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